Native

import UIKit
import BuzzvilSDK

final class ViewController: UIViewController {
  private let nativeAd2View = BZVNativeAd2View(frame: .zero)
  private let mediaView = BZVMediaView(frame: .zero)
  private let iconImageView = UIImageView(frame: .zero)
  private let titleLabel = UILabel(frame: .zero)
  private let descriptionLabel = UILabel(frame: .zero)
  private let ctaView = BZVDefaultCtaView(frame: .zero)
  private let nativeToFeedView = BZVNativeToFeedView(frame: .zero)

  private lazy var viewBinder = BZVNativeAd2ViewBinder
    .Builder(unitId: "YOUR_NATIVE_UNIT_ID")
    .nativeAd2View(nativeAd2View)
    .mediaView(mediaView)
    .iconImageView(iconImageView)
    .titleLabel(titleLabel)
    .descriptionLabel(descriptionLabel)
    .ctaView(ctaView)
    .build()
  
  override func viewDidLoad() {
    super.viewDidLoad()
    
    self.view.addSubview(nativeAd2View)
    nativeAd2View.addSubview(mediaView)
    nativeAd2View.addSubview(iconImageView)
    nativeAd2View.addSubview(titleLabel)
    nativeAd2View.addSubview(descriptionLabel)
    nativeAd2View.addSubview(ctaView)

    self.view.addSubView(nativeToFeedView)
    nativeToFeedView.setUnitId("YOUR_NATIVE_UNIT_ID")

    // AutoLayout Constraints 설정 
    // ...
  }
}

@import BuzzvilSDK;

@interface ViewController ()

@property (nonatomic, strong, readonly) BZVNativeAd2View *nativeAd2View;
@property (nonatomic, strong, readonly) BZVMediaView *mediaView;
@property (nonatomic, strong, readonly) UIImageView *iconImageView;
@property (nonatomic, strong, readonly) UILabel *titleLabel;
@property (nonatomic, strong, readonly) UILabel *descriptionLabel;
@property (nonatomic, strong, readonly) BZVDefaultCtaView *ctaView;
@property (nonatomic, strong, readonly) BZVNativeAd2ViewBinder *viewBinder;
@property (nonatomic, strong, readonly) BZVNativeToFeedView *nativeToFeedView;

@end

@implementation ViewController

- (void)viewDidLoad {
  [super viewDidLoad];

  _nativeAd2View = [[BZVNativeAd2View alloc] initWithFrame:CGRectZero];
  [self.view addSubview:_nativeAd2View];

  _mediaView = [[BZVMediaView alloc] initWithFrame:CGRectZero];
  [_nativeAd2View addSubview:_mediaView];

  _iconImageView = [[UIImageView alloc] initWithFrame:CGRectZero];
  [_nativeAd2View addSubview:_iconImageView];

  _titleLabel = [[UILabel alloc] initWithFrame:CGRectZero];
  [_nativeAd2View addSubview:_titleLabel];

  _descriptionLabel = [[UILabel alloc] initWithFrame:CGRectZero];
  [_nativeAd2View addSubview:_descriptionLabel];

  _ctaView = [[BZVDefaultCtaView alloc] initWithFrame:CGRectZero];
  [_nativeAd2View addSubview:_ctaView];
  
  _viewBinder = [BZVNativeAd2ViewBinder viewBinderWithBlock:^(BZVNativeAd2ViewBinderBuilder * _Nonnull builder) {
    builder.unitId = @"YOUR_NATIVE_UNIT_ID";
    builder.nativeAd2View = self.nativeAd2View;
    builder.mediaView = self.mediaView;
    builder.iconImageView = self.iconImageView;
    builder.titleLabel = self.titleLabel;
    builder.descriptionLabel = self.descriptionLabel;
    builder.ctaView = self.ctaView;
  }];

  _nativeToFeedView = [[BZVNativeToFeedView alloc] initWithFrame:CGRectZero];
  [self.view addSubview:_nativeToFeedView];

  [_nativeToFeedView setWithUnitId:@"YOUR_NATIVE_UNIT_ID"];

  // AutoLayout Constraints 설정
  // ...
}

@end

final class ViewController: UIViewController {
  // ...생략...
  private let activityIndicatorView = UIActivityIndicatorView(frame: .zero)

  override func viewDidLoad() {
    // ...생략...

    // Warning: retain cycle 방지를 위해 closure 내에서 반드시 weak self를 사용해주세요.
    viewBinder.subscribeEvents(onRequest: { [weak self] in
      // 광고 할당을 요청한 상태입니다.
      // 이후에는 onNext, onCompleted, onError 중 하나가 호출됩니다.
      // 광고 자동 갱신을 시도할 때마다 반복적으로 호출됩니다.
      // 로딩 화면 등을 구현할 수 있습니다.
      self?.activityIndicatorView.startAnimating()
    }, onNext: { [weak self] nativeAd2 in
      // 광고 할당에 성공하면 호출됩니다.
      // 이후에 광고 갱신 시 onRequest가 다시 호출됩니다.
      // 광고 자동 갱신을 성공할 때마다 반복적으로 호출됩니다.
      // 로딩 화면 등을 구현한 경우, 여기에서 로딩을 종료합니다.
      self?.activityIndicatorView.stopAnimating()
    }, onError: { [weak self] error in
      // 최초 광고 할당에 실패하면 호출됩니다.
      // 로딩 화면 등을 구현한 경우, 여기에서 로딩을 종료합니다.
      self?.activityIndicatorView.stopAnimating()
      // NativeAd2View를 숨기거나, Error UI로 대체할 수 있습니다.
      print("Failed to load ad by \(error.localizedDescription).")
    }, onCompleted: { [weak self] in
      // 더 이상 갱신할 수 있는 광고가 없을 때 호출됩니다.
      // 로딩 화면 등을 구현한 경우, 여기에서 로딩을 종료합니다.
      self?.activityIndicatorView.stopAnimating()
    })

    // 광고 할당 및 표시를 자동으로 수행합니다.
    viewBinder.bind()
  }
}

@interface ViewController ()
// ...생략...
@property (nonatomic, strong, readonly) UIActivityIndicatorView *activityIndicatorView;

@end

@implementation ViewController

- (void)viewDidLoad {
  // ...생략...

  // Warning: retain cycle 방지를 위해 weak self를 사용해주세요.
  __weak typeof(self) weakSelf = self;
  [_viewBinder subscribeEventsOnRequest:^{
    // 광고 할당을 요청하면 호출됩니다.
    // 이후에는 onNext, onCompleted, onError 중 하나가 호출됩니다.
    // 광고 자동 갱신을 시도할 때마다 반복적으로 호출됩니다.
    // 로딩 화면 등을 구현할 수 있습니다.
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      [strongSelf.activityIndicatorView startAnimating];
    }
  } onNext:^(BZVNativeAd2 * _Nonnull nativeAd2) {
    // 광고 할당에 성공하면 호출됩니다.
    // 이후에 광고 갱신 시 onRequest가 다시 호출됩니다.
    // 광고 자동 갱신을 성공할 때마다 반복적으로 호출됩니다.
    // 로딩 화면 등을 구현한 경우, 여기에서 로딩을 종료합니다.
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      [strongSelf.activityIndicatorView stopAnimating];
    }
  } onError:^(NSError * _Nonnull error) {
    // 최초 광고 할당에 실패하면 호출됩니다.
    // 로딩 화면 등을 구현한 경우, 여기에서 로딩을 종료합니다.
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      [strongSelf.activityIndicatorView stopAnimating];
    }
    // NativeAd2View를 숨기거나, Error UI로 대체할 수 있습니다.
    NSLog(@"Failed to load ad by %@.", error.localizedDescription);
  } onCompleted:^{
    // 더 이상 갱신할 수 있는 광고가 없을 때 호출됩니다.
    // 로딩 화면 등을 구현한 경우, 여기에서 로딩을 종료합니다.
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      [strongSelf.activityIndicatorView stopAnimating];
    }
  }];

  // 광고 할당 및 표시를 자동으로 수행합니다.
  [_viewBinder bind];
}

@end

BuzzAdBenefit.getAvailableFeedBaseReward(for: YOUR_FEED_UNIT_ID) { [weak self] (reward) in
  guard let self = self else { return }
  if reward > 0 {
    self.nativeToFeedLabel.text = "\(reward) 포인트 받고 더 많은 참여 기회 보기"
  } else {
    self.nativeToFeedLabel.text = "더 많은 참여 기회 보기"
  }
}

__weak typeof(self) weakSelf = self;
[BuzzAdBenefit getAvailableFeedBaseRewardFor:@"YOUR_FEED_UNIT_ID" onComplete:^(NSInteger reward) {
  __strong typeof(self) strongSelf = weakSelf;
  if (strongSelf) {
    if (reward > 0) {
      strongSelf.nativeToFeedLabel.text = [NSString stringWithFormat:@"%d 포인트 받고 더 많은 참여 기회 보기", reward];
    } else {
      strongSelf.nativeToFeedLabel.text = @"더 많은 참여 기회 보기";
    }
  }
}];

import UIKit
import BuzzvilSDK

final class ViewController: UIViewController {
  private let nativeAd2View = BZVNativeAd2View(frame: .zero)
  // ...생략...

  override func viewDidLoad() {
    // ...생략...
    nativeAd2View.videoDelegate = self
  }
}

// MARK: BZVNativeAdViewVideoDelegate
extension ViewController: BZVNativeAdViewVideoDelegate {
  func bzvNativeAdView(_ nativeAdView: BZVNativeAdView, willStartPlayingVideoAd nativeAd: BZVNativeAd) {
    // 비디오 광고의 비디오가 시작하기 직전에 호출됩니다.
  }

  func bzvNativeAdView(_ nativeAdView: BZVNativeAdView, didResumeVideoAd nativeAd: BZVNativeAd) {
    // 비디오 광고의 비디오가 재생되면 호출됩니다.
  }

  func bzvNativeAdView(_ nativeAdView: BZVNativeAdView, willReplayVideoAd nativeAd: BZVNativeAd) {
    // 비디오 광고의 비디오가 리플레이되면 호출됩니다.
  }

  func bzvNativeAdView(_ nativeAdView: BZVNativeAdView, didPauseVideoAd nativeAd: BZVNativeAd) {
    // 비디오 광고의 비디오가 일시정지되면 호출됩니다.
  }

  func bzvNativeAdView(_ nativeAdView: BZVNativeAdView, didFinishPlayingVideoAd nativeAd: BZVNativeAd) {
    // 비디오 광고의 비디오가 종료되면 호출됩니다.
  }
}

@import BuzzvilSDK;

@interface ViewController () <BZVNativeAdViewVideoDelegate>

@property (nonatomic, strong, readonly) BZVNativeAd2View *nativeAd2View;
// ...생략...

@end

@implementation ViewController

- (void)viewDidLoad {
  // ...생략...
  _nativeAd2View.videoDelegate = self;
}

#pragma mark - BZVNativeAdViewVideoDelegate
- (void)BZVNativeAdView:(BZVNativeAdView *)nativeAdView willStartPlayingVideoAd:(BZVNativeAd *)nativeAd {
  // 비디오 광고의 비디오가 시작하기 직전에 호출됩니다.
}

- (void)BZVNativeAdView:(BZVNativeAdView *)nativeAdView didResumeVideoAd:(BZVNativeAd *)nativeAd {
  // 비디오 광고의 비디오가 재생되면 호출됩니다.
}

- (void)BZVNativeAdView:(BZVNativeAdView *)nativeAdView willReplayVideoAd:(BZVNativeAd *)nativeAd {
  // 비디오 광고의 비디오가 리플레이되면 호출됩니다.
}

- (void)BZVNativeAdView:(BZVNativeAdView *)nativeAdView didPauseVideoAd:(BZVNativeAd *)nativeAd {
  // 비디오 광고의 비디오가 일시정지되면 호출됩니다.
}

- (void)BZVNativeAdView:(BZVNativeAdView *)nativeAdView didFinishPlayingVideoAd:(BZVNativeAd *)nativeAd {
  // 비디오 광고의 비디오가 종료되면 호출됩니다.
}

@end

final class ViewController: UIViewController {
  // ...생략...

  override func viewDidLoad() {
    // ...생략...

    // Native 광고 이벤트 처리를 위한 closure를 등록하고 각 이벤트에 따라 필요한 기능을 구현합니다.
    // 로그 기록, 단순 알림 외에 다른 동작을 추가하는 것을 권장하지 않습니다. 자동 갱신 등 네이티브 2.0의 기능과 직접 구현한 동작이 충돌할 수 있습니다.
    // Warning: 반드시 bind 함수를 호출하기 전에 호출해야 해야합니다.
    // Warning: retain cycle 방지를 위해 closure 내에서 반드시 weak self를 사용해주세요.
    viewBinder.subscribeAdEvents(onImpressed: { [weak self] nativeAd2 in
      // Native 광고가 유저에게 노출되었을 때 호출됩니다.
    }, onClicked: { [weak self] nativeAd2 in
      // 유저가 Native 광고를 클릭했을 때 호출됩니다.
    }, onRewardRequested: { [weak self] nativeAd2 in
      // 리워드 적립 요청시에 호출됩니다.
    }, onRewarded: { [weak self] nativeAd2, rewardResult in
      // 리워드 적립 결과를 수신했을 때 호출됩니다.
    }, onParticipated: { [weak self] nativeAd2 in
      // 광고 참여가 완료되었을 때 호출됩니다.
    })

    viewBinder.bind()
  }
}

@implementation ViewController

- (void)viewDidLoad {
  // ...생략...
  
  // Native 광고 이벤트 처리를 위한 closure를 등록하고 각 이벤트에 따라 필요한 기능을 구현합니다.
  // 로그 기록, 단순 알림 외에 다른 동작을 추가하는 것을 권장하지 않습니다. 자동 갱신 등 네이티브 2.0의 기능과 직접 구현한 동작이 충돌할 수 있습니다.
  // Warning: 반드시 bind 함수를 호출하기 전에 호출해야 해야합니다.
  // Warning: retain cycle 방지를 위해 closure 내에서 반드시 weak self를 사용해주세요.
  __weak typeof(self) weakSelf = self;
  [_viewBinder subscribeAdEventsOnImpressed:^(BZVNativeAd2 * _Nonnull nativeAd2) {
    __strong typeof(self) strongSelf = weakSelf;
    // Native 광고가 유저에게 노출되었을 때 호출됩니다.
  } onClicked:^(BZVNativeAd2 * _Nonnull nativeAd2) {
    __strong typeof(self) strongSelf = weakSelf;
    // 유저가 Native 광고를 클릭했을 때 호출됩니다.
  } onRewardRequested:^(BZVNativeAd2 * _Nonnull nativeAd2) {
    __strong typeof(self) strongSelf = weakSelf;
    // 리워드 적립 요청시에 호출됩니다.
  } onRewarded:^(BZVNativeAd2 * _Nonnull nativeAd2, BZVRewardResult rewardResult) {
    __strong typeof(self) strongSelf = weakSelf;
    // 리워드 적립 결과를 수신했을 때 호출됩니다.
  } onParticipated:^(BZVNativeAd2 * _Nonnull nativeAd2) {
    __strong typeof(self) strongSelf = weakSelf;
    // 광고 참여가 완료되었을 때 호출됩니다.
  }];

  [_viewBinder bind];
}

@end

private lazy var viewBinder = BZVNativeAd2ViewBinder
  .Builder(unitId: "YOUR_NATIVE_UNIT_ID")
  .nativeAd2View(nativeAd2View)
  .mediaView(mediaView)
  .iconImageView(iconImageView)
  .titleLabel(titleLabel)
  .descriptionLabel(descriptionLabel)
  .ctaView(ctaView)
  .setClickableViews([ // (optional) 클릭 가능한 영역을 설정 할 수 있습니다.
    mediaView,
    ctaView
  ])
  .build()

_viewBinder = [BZVNativeAd2ViewBinder viewBinderWithBlock:^(BZVNativeAd2ViewBinderBuilder * _Nonnull builder) {
  builder.unitId = @"YOUR_NATIVE_UNIT_ID";
  builder.nativeAd2View = self.nativeAd2View;
  builder.mediaView = self.mediaView;
  builder.iconImageView = self.iconImageView;
  builder.titleLabel = self.titleLabel;
  builder.descriptionLabel = self.descriptionLabel;
  builder.ctaView = self.ctaView;
  builder.clickableViews = @[self.mediaView, self.ctaView]; // (optional) 클릭 가능한 영역을 설정 할 수 있습니다.
}];

import UIKit
import BuzzvilSDK

final class CarouselViewController: UIViewController {
  private let unitID = "YOUR_UNIT_ID"
  
  // 최대 10개의 광고를 요청할 수 있습니다.
  private let adRequestCount = 5

  // 실제 할당받은 광고의 개수입니다. 
  // 이 값은 collectionView datasource의 collectionView(_:numberOfItemsInSection:) 함수의 return 값으로 사용합니다.
  private var loadedAdCount = 0

  // 광고 중복 할당을 막기 위해 하나의 캐러셀에 하나의 NativeAd2Pool 인스턴스를 생성하여 사용합니다.
  private lazy var pool = BZVNativeAd2Pool(unitId: unitId)

  override func viewDidLoad() {
    super.viewDidLoad()
    setupCarousel()
  }

  private func setupCarousel() {
    // BZVNativeAd2Pool에 광고 할당을 요청합니다.
    pool.loadAds(count: adRequestCount) { [weak self] adCount in
      // 실제로 할당받은 광고의 개수(adCount)를 업데이트합니다.
      self?.loadedAdCount = adCount
    } errorHandler: { [weak self] error in
      // 광고 할당 실패 시 발생하는 NSError 오류 코드에 대한 자세한 내용은 오류 코드가 나타납니다 토픽을 참고하세요.
    }
  }
}

@import BuzzvilSDK;

static NSString * const kUnitId = @"YOUR_UNIT_ID";

@interface CarouselViewController ()

// 최대 10개의 광고를 요청할 수 있습니다.
@property (nonatomic, assign, readonly) NSInteger adRequestCount;

// 실제 할당받은 광고의 개수입니다. 
// 이 값은 collectionView datasource의 collectionView(_:numberOfItemsInSection:) 함수의 return 값으로 사용합니다.
@property (nonatomic, assign, readwrite) NSInteger loadedAdCount;

// 광고 중복 할당을 막기 위해 하나의 캐러셀에 하나의 NativeAd2Pool 인스턴스를 생성하여 사용합니다.
@property (nonatomic, strong, readonly) BZVNativeAd2Pool *pool;

@end

@implementation CarouselViewController

- (void)viewDidLoad {
  [super viewDidLoad];

  _adRequestCount = 5;
  _loadedAdCount = 0;
  _pool = [[BZVNativeAd2Pool alloc] initWithUnitId:kUnitId];  

  [self setupCarousel];
}

- (void)setupCarousel {
  __weak typeof(self) weakSelf = self;
  // BZVNativeAd2Pool에 광고 할당을 요청합니다.
  [self.pool loadAdsWithCount:self.adRequestCount completionHandler:^(NSInteger adCount) {
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      // 실제로 할당받은 광고의 개수(adCount)를 업데이트합니다.
      strongSelf.loadedAdCount = adCount;
    }
  } errorHandler:^(NSError * _Nonnull error) {
    // 광고 할당 실패 시 발생하는 NSError 오류 코드에 대한 자세한 내용은 오류 코드가 나타납니다 토픽을 참고하세요.
  }];
}

@end

import UIKit
import BuzzvilSDK

final class CarouselCell: UICollectionViewCell {
  private lazy var nativeAd2View = BZVNativeAd2View(frame: .zero)
  private lazy var mediaView = BZVMediaView(frame: .zero)
  private lazy var iconImageView = UIImageView(frame: .zero)
  private lazy var titleLabel = UILabel(frame: .zero)
  private lazy var descriptionLabel = UILabel(frame: .zero)
  private lazy var ctaView = BZVDefaultCtaView(frame: .zero)

  override init(frame: CGRect) {
    super.init(frame: frame)
    setupView()
    setupLayout()
  }

  required init?(coder: NSCoder) {
    fatalError()
  }

  private func setupView() {
    contentView.addSubview(nativeAd2View)
    nativeAd2View.addSubview(mediaView)
    nativeAd2View.addSubview(iconImageView)
    nativeAd2View.addSubview(titleLabel)
    nativeAd2View.addSubview(descriptionLabel)
    nativeAd2View.addSubview(ctaView)
  }

  private func setupLayout() {
    // eg. auto layout constraints for nativeAd2View
    nativeAd2View.translatesAutoresizingMaskIntoConstraints = false
    NSLayoutConstraint.activate([
      nativeAd2View.topAnchor.constraint(equalTo: safeAreaLayoutGuide.topAnchor),
      nativeAd2View.leadingAnchor.constraint(equalTo: safeAreaLayoutGuide.leadingAnchor, constant: 16),
      nativeAd2View.trailingAnchor.constraint(equalTo: safeAreaLayoutGuide.trailingAnchor, constant: -16),
      nativeAd2View.bottomAnchor.constraint(equalTo: safeAreaLayoutGuide.bottomAnchor),
    ])

    // AutoLayout Constraints를 설정하세요.
    // ...
  }
}

@import BuzzvilSDK;

@interface CarouselCell ()

@property (nonatomic, strong, readonly) BZVNativeAd2View *nativeAd2View;
@property (nonatomic, strong, readonly) BZVMediaView *mediaView;
@property (nonatomic, strong, readonly) UIImageView *iconImageView;
@property (nonatomic, strong, readonly) UILabel *titleLabel;
@property (nonatomic, strong, readonly) UILabel *descriptionLabel;
@property (nonatomic, strong, readonly) BZVDefaultCtaView *ctaView;

@end

@implementation CarouselCell

- (instancetype)initWithFrame:(CGRect)frame {
  if (self = [super initWithFrame:frame]) {
    [self setupView];
    [self setupLayout];
  }
  return self;
}

- (void)setupView {
  _nativeAd2View = [[BZVNativeAd2View alloc] initWithFrame:CGRectZero];
  [self.contentView addSubview:_nativeAd2View];

  _mediaView = [[BZVMediaView alloc] initWithFrame:CGRectZero];
  [self.nativeAd2View addSubview:_mediaView];

  _iconImageView = [[UIImageView alloc] initWithFrame:CGRectZero];
  [self.nativeAd2View addSubview:_iconImageView];

  _titleLabel = [[UILabel alloc] initWithFrame:CGRectZero];
  [self.nativeAd2View addSubview:_titleLabel];

  _descriptionLabel = [[UILabel alloc] initWithFrame:CGRectZero];
  [self.nativeAd2View addSubview:_descriptionLabel];

  _ctaView = [[BZVDefaultCtaView alloc] initWithFrame:CGRectZero];
  [self.nativeAd2View addSubview:_ctaView];
}

- (void)setupLayout {
  // eg. auto layout constraints for nativeAd2View
  _nativeAd2View.translatesAutoresizingMaskIntoConstraints = NO;
  [NSLayoutConstraint activateConstraints:@[
    [_nativeAd2View.topAnchor constraintEqualToAnchor:self.contentView.safeAreaLayoutGuide.topAnchor],
    [_nativeAd2View.leadingAnchor constraintEqualToAnchor:self.contentView.safeAreaLayoutGuide.leadingAnchor constant:16],
    [_nativeAd2View.trailingAnchor constraintEqualToAnchor:self.contentView.safeAreaLayoutGuide.trailingAnchor constant:-16],
    [_nativeAd2View.bottomAnchor constraintEqualToAnchor:self.contentView.safeAreaLayoutGuide.bottomAnchor],
  ]];
  
  // AutoLayout Constraints를 설정하세요.
  // ...
}

@end

final class CarouselCell: UICollectionViewCell {
  private lazy var nativeAd2View = BZVNativeAd2View(frame: .zero)
  private lazy var mediaView = BZVMediaView(frame: .zero)
  private lazy var iconImageView = UIImageView(frame: .zero)
  private lazy var titleLabel = UILabel(frame: .zero)
  private lazy var descriptionLabel = UILabel(frame: .zero)
  private lazy var ctaView = BZVDefaultCtaView(frame: .zero)
  
  // NativeAd2View와 하위 컴포넌트를 연결합니다.
  private lazy var viewBinder = BZVNativeAd2ViewBinder
    .Builder(unitId: "YOUR_NATIVE_UNIT_ID")
    .nativeAd2View(nativeAd2View)
    .mediaView(mediaView)
    .iconImageView(iconImageView)
    .titleLabel(titleLabel)
    .descriptionLabel(descriptionLabel)
    .ctaView(ctaView)
    .build()
  
  // ...
}

@interface CarouselCell ()

@property (nonatomic, strong, readonly) BZVNativeAd2View *nativeAd2View;
@property (nonatomic, strong, readonly) BZVMediaView *mediaView;
@property (nonatomic, strong, readonly) UIImageView *iconImageView;
@property (nonatomic, strong, readonly) UILabel *titleLabel;
@property (nonatomic, strong, readonly) UILabel *descriptionLabel;
@property (nonatomic, strong, readonly) BZVDefaultCtaView *ctaView;
@property (nonatomic, strong, readonly) BZVNativeAd2ViewBinder *viewBinder;

@end

@implementation CarouselCell

// ...

- (void)setupView {
  // ...
  
  // NativeAd2View와 하위 컴포넌트를 연결합니다.
  [BZVNativeAd2ViewBinder viewBinderWithBlock:^(BZVNativeAd2ViewBinderBuilder * _Nonnull builder) {
    builder.unitId = @"YOUR_NATIVE_UNIT_ID";
    builder.nativeAd2View = self.nativeAd2View;
    builder.mediaView = self.mediaView;
    builder.iconImageView = self.iconImageView;
    builder.titleLabel = self.titleLabel;
    builder.descriptionLabel = self.descriptionLabel;
    builder.ctaView = self.ctaView;
  }];
}

// ...

@end

final class CarouselCell: UICollectionViewCell {
  // ...

  private lazy var viewBinder = BZVNativeAd2ViewBinder
    .Builder(unitId: "YOUR_NATIVE_UNIT_ID")
    .nativeAd2View(nativeAd2View)
    .mediaView(mediaView)
    .iconImageView(iconImageView)
    .titleLabel(titleLabel)
    .descriptionLabel(descriptionLabel)
    .ctaView(ctaView)
    .build()
  
  // ...

  override func prepareForReuse() {
    super.prepareForReuse()
    // prepareForReuse 내에서 unbind를 반드시 호출하여 cell을 재사용할 때 문제가 발생하지 않게 합니다.
    viewBinder.unbind()
  }

  // collectionView의 collectionView(_:cellForItemAt:) 시점에 호출합니다.
  func setPool(with pool: BZVNativeAd2Pool, for adKey: Int) {
    // 해당 index(adKey)에 해당하는 NativeAd2ViewBinder가 NativeAd2Pool을 사용하도록 합니다.
    viewBinder.setPool(pool, at: adKey)
  }

  // collectionView의 collectionView(_:cellForItemAt:) 시점에 호출합니다.
  func bind() {
    // NativeAd2ViewBinder의 bind()를 호출하면 광고 할당 및 갱신이 자동으로 수행됩니다.
    viewBinder.bind()
  }
}

@interface CarouselCell : UICollectionViewCell

- (void)setPool:(BZVNativeAd2Pool *)pool forAdKey:(NSInteger)adKey;
- (void)bind;

@end

@interface CarouselCell ()

// ...
@property (nonatomic, strong, readonly) BZVNativeAd2ViewBinder *viewBinder;

@end

@implementation CarouselCell

// ...

- (void)prepareForReuse {
  [super prepareForReuse];
  // prepareForReuse 내에서 unbind를 반드시 호출하여 cell을 재사용할 때 문제가 발생하지 않게 합니다.
  [_viewBinder unbind];
}

// collectionView의 collectionView(_:cellForItemAt:) 시점에 호출합니다.
- (void)setPool:(BZVNativeAd2Pool *)pool forAdKey:(NSInteger)adKey {
  // 해당 index(adKey)에 해당하는 NativeAd2ViewBinder가 NativeAd2Pool을 사용하도록 합니다.
  [_viewBinder setPool:pool at:adKey];
}

// collectionView의 collectionView(_:cellForItemAt:) 시점에 호출합니다.
- (void)bind {
  // NativeAd2ViewBinder의 bind()를 호출하면 광고 할당 및 갱신이 자동으로 수행됩니다.
  [_viewBinder bind];
}

@end

final class CarouselViewController: UIViewController {
  // ...

  // 광고를 표시할 Carousel CollectionView
  private lazy var carouselCollectionView: UICollectionView = {
    let collectionView = UICollectionView(frame: .zero)
    collectionView.register(CarouselCell.self, forCellWithReuseIdentifier: "CarouselCell")
    collectionView.delegate = self
    collectionView.dataSource = self
    collectionView.showsHorizontalScrollIndicator = false
    collectionView.isPagingEnabled = true
    return collectionView
  }()

  override func viewDidLoad() {
    super.viewDidLoad()
    setupCarousel()
    setupView()
    setupLayout()
  }

  // ... 
  
  private func setupView() {
    view.addSubview(carouselCollectionView)
  }
  
  private func setupLayout() {
    // eg. auto layout constraints for carouselCollectionView
    carouselCollectionView.translatesAutoresizingMaskIntoConstraints = false
    NSLayoutConstraint.activate([
      carouselCollectionView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 16),
      carouselCollectionView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor),
      carouselCollectionView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor),
      carouselCollectionView.heightAnchor.constraint(equalTo: carouselCollectionView.widthAnchor, multiplier: 0.8),
    ])
  }

  // ...
}

@interface CarouselViewController () <UICollectionViewDelegate, UICollectionViewDataSource>

// ...

// 광고를 표시할 Carousel CollectionView
@property (nonatomic, strong, readonly) UICollectionView *carouselCollectionView;

@end

@implementation CarouselViewController

- (void)viewDidLoad {
  [super viewDidLoad];

  _adRequestCount = 5;
  _loadedAdCount = 0;
  _pool = [[BZVNativeAd2Pool alloc] initWithUnitId:kUnitId];

  [self setupCarousel];
  [self setupView];
    [self setupLayout];
}

// ...

- (void)setupView {
  _carouselCollectionView = [[UICollectionView alloc] initWithFrame:CGRectZero];
  [_carouselCollectionView registerClass:[CarouselCell class] forCellWithReuseIdentifier:@"CarouselCell"];
  _carouselCollectionView.delegate = self;
  _carouselCollectionView.dataSource = self;
  _carouselCollectionView.showsHorizontalScrollIndicator = NO;
  _carouselCollectionView.pagingEnabled = YES;
  [self.view addSubview:_carouselCollectionView];
}

- (void)setupLayout {
  // eg. auto layout constraints for carouselCollectionView
  self.carouselCollectionView.translatesAutoresizingMaskIntoConstraints = NO;
  [NSLayoutConstraint activateConstraints:@[
    [self.carouselCollectionView.topAnchor constraintEqualToAnchor:self.view.safeAreaLayoutGuide.topAnchor constant:16],
    [self.carouselCollectionView.leadingAnchor constraintEqualToAnchor:self.view.safeAreaLayoutGuide.leadingAnchor],
    [self.carouselCollectionView.trailingAnchor constraintEqualToAnchor:self.view.safeAreaLayoutGuide.trailingAnchor],
    [self.carouselCollectionView.heightAnchor constraintEqualToAnchor:self.carouselCollectionView.widthAnchor multiplier:0.8]
  ]];
}

// ...

@end

final class CarouselViewController: UIViewController {
  // ...

  private var loadedAdCount = 0
  
  private lazy var carouselCollectionView: UICollectionView = {
    let collectionView = UICollectionView(frame: .zero)
    // ...
    return collectionView
  }()
  
  // ...
}

extension CarouselViewController: UICollectionViewDataSource {
  func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return loadedAdCount
  }
  
  func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CarouselCell", for: indexPath) as? CarouselCell else {
      return UICollectionViewCell()
    }

    // 광고 데이터들을 관리하는 NativeAd2Pool을 collectionView index에 해당하는 cell 내의 viewBinder에 설정합니다.
    cell.setPool(with: pool, for: indexPath.item)

    // Warining: bind를 호출하기 전에 반드시 setPool을 호출해야 합니다.
    // 설정한 NativeAd2Pool의 광고 데이터를 cell에 나타냅니다. bind를 호출한 이후에는 광고 할당 및 갱신이 자동으로 수행됩니다.
    cell.bind()
    return cell
  }
}

@interface CarouselViewController () <UICollectionViewDelegate, UICollectionViewDataSource>

@property (nonatomic, strong, readonly) UICollectionView *carouselCollectionView;
@property (nonatomic, assign, readwrite) NSInteger loadedAdCount;

@end

@implementation CarouselViewController

- (void)viewDidLoad {
  [super viewDidLoad];
  
  _loadedAdCount = 0;

  // ...
}

// ...

#pragma mark - UICollectionViewDataSource

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
  return _loadedAdCount;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
  CarouselCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"CarouselCell" forIndexPath:indexPath];
  
  // 광고 데이터들을 관리하는 NativeAd2Pool을 collectionView index에 해당하는 cell 내의 viewBinder에 설정합니다.
  [cell setPool:_pool forAdKey:indexPath.item];
  
  // Warining: bind를 호출하기 전에 반드시 setPool을 호출해야 합니다.
  // 설정한 NativeAd2Pool의 광고 데이터를 cell에 나타냅니다. bind를 호출한 이후에는 광고 할당 및 갱신이 자동으로 수행됩니다.
  [cell bind];
  return cell;
}

@end

final class CarouselViewController: UIViewController {
  // ...

  private lazy var flowLayout: UICollectionViewFlowLayout = {
    let flowLayout = UICollectionViewFlowLayout()
    flowLayout.scrollDirection = .horizontal
    flowLayout.minimumLineSpacing = .zero
    flowLayout.minimumInteritemSpacing = .zero
    return flowLayout
  }()
  
  private lazy var carouselCollectionView: UICollectionView = {
    // flowLayout을 carouselCollectionView에 설정하세요.
    let collectionView = UICollectionView(frame: .zero, collectionViewLayout: flowLayout)
    // ...
    return collectionView
  }()
  
  // ...
}

// ...

extension CarouselViewController: UICollectionViewDelegateFlowLayout {
  func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    return CGSize(width: collectionView.frame.size.width, height: collectionView.frame.size.height)
  }
}

@interface CarouselViewController () <UICollectionViewDelegate, UICollectionViewDataSource>

@property (nonatomic, strong, readonly) UICollectionView *carouselCollectionView;

@end

@implementation CarouselViewController

// ...

- (void)setupView {
  UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
  flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
  flowLayout.minimumLineSpacing = 0;
  flowLayout.minimumInteritemSpacing = 0;
  
  // flowLayout을 carouselCollectionView에 설정하세요.
  _carouselCollectionView = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:flowLayout];
  // ...
}

// ...

#pragma mark - UICollectionViewDelegateFlowLayout

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
  return CGSizeMake(collectionView.frame.size.width, collectionView.frame.size.height);
}

@end

final class CarouselViewController: UIViewController {
  // ...

  private lazy var carouselCollectionView: UICollectionView = {
    let collectionView = UICollectionView(frame: .zero, collectionViewLayout: flowLayout)
    // ...
    return collectionView
  }()

  private lazy var pool = BZVNativeAd2Pool(unitId: unitId)

  override func viewDidLoad() {
    super.viewDidLoad()
    // ...
    setupCarousel()
  }

  // ...

  private func setupCarousel() {
    pool.loadAds(count: adRequestCount) { [weak self] adCount in
      // ...

      // 광고 할당이 완료되면 carouselCollectionView를 갱신합니다.
      self?.carouselCollectionView.reloadData()
    } errorHandler: { [weak self] error in
      // ...
    }
  }
}

@interface CarouselViewController () <UICollectionViewDelegate, UICollectionViewDataSource>

// ...
@property (nonatomic, strong, readonly) UICollectionView *carouselCollectionView;
@property (nonatomic, strong, readonly) BZVNativeAd2Pool *pool;

@end

@implementation CarouselViewController

- (void)viewDidLoad {
  [super viewDidLoad];
  // ...
  [self setupCarousel];
}

// ...

- (void)setupCarousel {
  __weak typeof(self) weakSelf = self;
  [self.pool loadAdsWithCount:self.adRequestCount completionHandler:^(NSInteger adCount) {
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      // ...

      // 광고 할당이 완료되면 carouselCollectionView를 갱신합니다.
      [strongSelf.carouselCollectionView reloadData];
    }
  } errorHandler:^(NSError * _Nonnull error) {
    // ...
  }];
}

@end

final class CarouselViewController: UIViewController {
  // ...

  private lazy var pageControl: UIPageControl = {
    let pageControl = UIPageControl(frame: .zero)
    pageControl.currentPage = .zero
    pageControl.isUserInteractionEnabled = false
    return pageControl
  }()
  
  // ...

  override func viewDidLoad() {
    super.viewDidLoad()
    setupView()
    setupLayout()
    // ...
  }

  private func setupView() {
    // ...
    view.addSubview(pageControl)
  }
  
  private func setupLayout() {
    // ...

    // eg. auto layout constraints for pageControl
    pageControl.translatesAutoresizingMaskIntoConstraints = false
    NSLayoutConstraint.activate([
      pageControl.topAnchor.constraint(equalTo: carouselCollectionView.bottomAnchor, constant: 16),
      pageControl.centerXAnchor.constraint(equalTo: carouselCollectionView.centerXAnchor),
    ])
  }
}

@interface CarouselViewController () <UICollectionViewDelegate, UICollectionViewDataSource>

// ...
@property (nonatomic, strong, readonly) UIPageControl *pageControl;

@end

@implementation CarouselViewController

- (void)viewDidLoad {
  [super viewDidLoad];
  // ...
  [self setupView];
  [self setupLayout];
  // ...
}

- (void)setupView {
  // ...
  
  _pageControl = [[UIPageControl alloc] initWithFrame:CGRectZero];
  _pageControl.currentPage = 0;
  _pageControl.userInteractionEnabled = NO;
  [self.view addSubview:self.pageControl];
}

- (void)setupLayout {
  // ...

  // eg. auto layout constraints for pageControl 
  _pageControl.translatesAutoresizingMaskIntoConstraints = NO;
  [NSLayoutConstraint activateConstraints:@[
    [_pageControl.topAnchor constraintEqualToAnchor:_carouselCollectionView.bottomAnchor constant:16],
    [_pageControl.centerXAnchor constraintEqualToAnchor:_carouselCollectionView.centerXAnchor],
  ]];
}

@end

final class CarouselViewController: UIViewController {
  // ...

  private lazy var pageControl: UIPageControl = {
    let pageControl = UIPageControl(frame: .zero)
    // ...
    return pageControl
  }()
  
  // ...

  override func viewDidLoad() {
    super.viewDidLoad()
    // ...
    setupCarousel()
  }

  // ...

  private func setupCarousel() {
    pool.loadAds(count: adRequestCount) { [weak self] adCount in
      // ...
      self?.pageControl.numberOfPages = adCount
    } errorHandler: { [weak self] error in
      // ...
    }
  }
}

@interface CarouselViewController () <UICollectionViewDelegate, UICollectionViewDataSource>

// ...
@property (nonatomic, strong, readonly) UIPageControl *pageControl;

@end

@implementation CarouselViewController

- (void)viewDidLoad {
  [super viewDidLoad];
  // ...
  [self setupCarousel];
}

// ...

- (void)setupCarousel {
  __weak typeof(self) weakSelf = self;
  [self.pool loadAdsWithCount:self.adRequestCount completionHandler:^(NSInteger adCount) {
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      // ...
      strongSelf.pageControl.numberOfPages = adCount;
    }
  } errorHandler:^(NSError * _Nonnull error) {
    // ...
  }];
}

@end

final class CarouselViewController: UIViewController {
  // ...

  private lazy var pageControl: UIPageControl = {
    let pageControl = UIPageControl(frame: .zero)
    // ...
    return pageControl
  }()
  
  // ...
}

// ...

extension CarouselViewController: UICollectionViewDelegate {
  func scrollViewDidScroll(_ scrollView: UIScrollView) {
    let centerOffsetX = scrollView.contentOffset.x + (scrollView.frame.width / 2)
    let pageWidth = scrollView.frame.width
    
    // pageWidth가 0이 되는 경우 division by zero를 방지합니다.
    guard pageWidth != .zero else { return }
    // 현재 캐러셀 아이템의 인덱스를 pageControl의 currentPage에 지정합니다.
    pageControl.currentPage = Int(centerOffsetX / pageWidth)
  }
}

@interface CarouselViewController () <UICollectionViewDelegate, UICollectionViewDataSource>

// ...
@property (nonatomic, strong, readonly) UIPageControl *pageControl;

@end

@implementation CarouselViewController

// ...

#pragma mark - UICollectionViewDelegate

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
  CGFloat centerOffsetX = scrollView.contentOffset.x + (scrollView.frame.size.width / 2);
  CGFloat pageWidth = scrollView.frame.size.width;
  
  // pageWidth가 0이 되는 경우 division by zero를 방지합니다.
  if (pageWidth == 0) {
    return;
  }
  // 현재 캐러셀 아이템의 인덱스를 pageControl의 currentPage에 지정합니다.
  _pageControl.currentPage = (NSInteger)centerOffsetX / (NSInteger)pageWidth;
}

@end

import UIKit
import BuzzvilSDK

final class FeedPromotionCell: UICollectionViewCell {
  private lazy var feedPromotionView: BZVFeedPromotionView = BZVFeedPromotionView(frame: .zero)
  private lazy var creativeView: UIImageView = UIImageView(frame: .zero)
  private lazy var iconImageView: UIImageView = UIImageView(frame: .zero)
  private lazy var titleLabel: UILabel = UILabel(frame: .zero)
  private lazy var ctaView: BZVDefaultCtaView = BZVDefaultCtaView(frame: .zero)
  
  override init(frame: CGRect) {
    super.init(frame: frame)
    setupView()
    setupLayout()
  }
  
  required init?(coder: NSCoder) {
    fatalError()
  }
  
  private func setupView() {
    contentView.addSubview(feedPromotionView)
    feedPromotionView.addSubview(creativeView)
    feedPromotionView.addSubview(iconImageView)
    feedPromotionView.addSubview(titleLabel)
    feedPromotionView.addSubview(ctaView)
  }
  
  private func setupLayout() {
    // AutoLayout Constraints를 설정하세요.
    // ...
  }
}

#import "FeedPromotionCell.h"
@import BuzzvilSDK;

@interface FeedPromotionCell ()

@property (nonatomic, strong, readonly) BZVFeedPromotionView *feedPromotionView;
@property (nonatomic, strong, readonly) UIImageView *creativeView;
@property (nonatomic, strong, readonly) UIImageView *iconImageView;
@property (nonatomic, strong, readonly) UILabel *titleLabel;
@property (nonatomic, strong, readonly) BZVDefaultCtaView *ctaView;

@end

@implementation FeedPromotionCell

- (instancetype)initWithFrame:(CGRect)frame {
  self = [super initWithFrame:frame];
  if (self) {
    [self setupView];
    [self setupLayout];
  }
  return self;
}

- (void)setupView {
  _feedPromotionView = [[BZVFeedPromotionView alloc] initWithFrame:CGRectZero];
  _creativeView = [[UIImageView alloc] initWithFrame:CGRectZero];
  _iconImageView = [[UIImageView alloc] initWithFrame:CGRectZero];
  _titleLabel = [[UILabel alloc] initWithFrame:CGRectZero];
  _ctaView = [[BZVDefaultCtaView alloc] initWithFrame:CGRectZero];

  [self.contentView addSubview:self.feedPromotionView];
  [self.feedPromotionView addSubview:self.creativeView];
  [self.feedPromotionView addSubview:self.iconImageView];
  [self.feedPromotionView addSubview:self.titleLabel];
  [self.feedPromotionView addSubview:self.ctaView];
}

- (void)setupLayout {
  // AutoLayout Constraints를 설정하세요.
  // ...
}

@end

final class FeedPromotionCell: UICollectionViewCell {
  private lazy var feedPromotionView: BZVFeedPromotionView = BZVFeedPromotionView(frame: .zero)
  private lazy var creativeView: UIImageView = UIImageView(frame: .zero)
  private lazy var iconImageView: UIImageView = UIImageView(frame: .zero)
  private lazy var titleLabel: UILabel = UILabel(frame: .zero)
  private lazy var ctaView: BZVDefaultCtaView = BZVDefaultCtaView(frame: .zero)
  
  // FeedPromotionView와 하위 컴포넌트를 연결합니다.
  private lazy var viewBinder = BZVFeedPromotionViewBinder
    .Builder(unitId: "YOUR_NATIVE_UNIT_ID")
    .feedPromotionView(feedPromotionView)
    .creativeView(creativeView)
    .iconImageView(iconImageView)
    .titleLabel(titleLabel)
    .ctaView(ctaView)
    .build()

  // ...
}

@interface FeedPromotionCell ()

@property (nonatomic, strong, readonly) BZVFeedPromotionView *feedPromotionView;
@property (nonatomic, strong, readonly) UIImageView *creativeView;
@property (nonatomic, strong, readonly) UIImageView *iconImageView;
@property (nonatomic, strong, readonly) UILabel *titleLabel;
@property (nonatomic, strong, readonly) BZVDefaultCtaView *ctaView;
@property (nonatomic, strong, readonly) BZVFeedPromotionViewBinder *viewBinder;

@end

@implementation FeedPromotionCell

// ...

- (void)setupView {
  // ...

  // NativeAd2View와 하위 컴포넌트를 연결합니다.
  _viewBinder = [BZVFeedPromotionViewBinder viewBinderWithBlock:^(BZVFeedPromotionViewBinderBuilder * _Nonnull builder) {
    builder.unitId = @"YOUR_NATIVE_UNIT_ID";
    builder.feedPromotionView = self.feedPromotionView;
    builder.creativeView = self.creativeView;
    builder.iconImageView = self.iconImageView;
    builder.titleLabel = self.titleLabel;
    builder.ctaView = self.ctaView;
  }];
}

// ...

@end

final class FeedPromotionCell: UICollectionViewCell {
  // ...
  
  private lazy var viewBinder = BZVFeedPromotionViewBinder
    .Builder(unitId: "YOUR_NATIVE_UNIT_ID")
    .feedPromotionView(feedPromotionView)
    .creativeView(creativeView)
    .iconImageView(iconImageView)
    .titleLabel(titleLabel)
    .ctaView(ctaView)
    .build()

  // ...

  override func prepareForReuse() {
    super.prepareForReuse()
    // prepareForReuse 내에서 unbind를 반드시 호출하여 cell을 재사용할 때 문제가 발생하지 않게 합니다.
    viewBinder.unbind()
  }

  // collectionView의 collectionView(_:cellForItemAt:) 시점에 호출합니다.
  func bind() {
    // BZVFeedPromotionViewBinder의 bind()를 호출하면 베네핏허브 진입 슬라이드 데이터가 자동으로 제공됩니다.
    viewBinder.bind()
  }
}

@interface FeedPromotionCell : UICollectionViewCell

- (void)bind;

@end

@interface FeedPromotionCell ()

// ...
@property (nonatomic, strong, readonly) BZVFeedPromotionViewBinder *viewBinder;

@end

@implementation FeedPromotionCell

// ...

- (void)prepareForReuse {
  [super prepareForReuse];
  // prepareForReuse 내에서 unbind를 반드시 호출하여 cell을 재사용할 때 문제가 발생하지 않게 합니다.
  [_viewBinder unbind];
}

// collectionView의 collectionView(_:cellForItemAt:) 시점에 호출합니다.
- (void)bind {
  // BZVFeedPromotionViewBinder의 bind()를 호출하면 베네핏허브 진입 슬라이드 데이터가 자동으로 제공됩니다.
  [_viewBinder bind];
}

@end

final class CarouselViewController: UIViewController {
  // ...

  // 광고를 표시할 Carousel CollectionView
  private lazy var carouselCollectionView: UICollectionView = {
    let collectionView = UICollectionView(frame: .zero)
    collectionView.register(CarouselCell.self, forCellWithReuseIdentifier: "CarouselCell")
    collectionView.register(FeedPromotionCell.self, forCellWithReuseIdentifier: "FeedPromotionCell")
    // ...
    return collectionView
  }()

  // ...
}

@interface CarouselViewController () <UICollectionViewDelegate, UICollectionViewDataSource>

// 광고를 표시할 Carousel CollectionView
@property (nonatomic, strong, readonly) UICollectionView *carouselCollectionView;

@end

@implementation CarouselViewController

// ...

- (void)setupView {
  _carouselCollectionView = [[UICollectionView alloc] initWithFrame:CGRectZero];
  [_carouselCollectionView registerClass:[CarouselCell class] forCellWithReuseIdentifier:@"CarouselCell"];
  [_carouselCollectionView registerClass:[FeedPromotionCell class] forCellWithReuseIdentifier:@"FeedPromotionCell"];
  // ...
}

// ...

@end

final class CarouselViewController: UIViewController {
  // ...
  private let adRequestCount = 5
  private let feedPromotionSlideCount = 1
  private var loadedAdCount = 0

  private lazy var pool = BZVNativeAd2Pool(unitId: unitId)
  
  // ...

  private func setupCarousel() {
    pool.loadAds(count: adRequestCount) { [weak self] adCount in
      // ...
      // 실제로 할당받은 광고의 개수(adCount)에 베네핏허브 진입 슬라이드 개수(feedPromotionSlideCount)를 더해서 cell 개수(loadedAdCount)를 설정합니다.
      self?.loadedAdCount = adCount + (self?.feedPromotionSlideCount ?? 1)
      self?.carouselCollectionView.reloadData()
    } errorHandler: { [weak self] error in
      // ...
      // 광고 할당이 실패했을 때, 베네핏허브 진입 슬라이드 1개가 보이도록 구성합니다.
      self?.loadedAdCount = self?.feedPromotionSlideCount ?? 1
      self?.carouselCollectionView.reloadData()
    }
  }
}

@interface CarouselViewController ()

// ...
@property (nonatomic, assign, readonly) NSInteger adRequestCount;
@property (nonatomic, assign, readonly) NSInteger feedPromotionSlideCount;
@property (nonatomic, assign, readwrite) NSInteger loadedAdCount;
@property (nonatomic, strong, readonly) BZVNativeAd2Pool *pool;

@end

@implementation CarouselViewController

- (void)viewDidLoad {
  [super viewDidLoad];

  _adRequestCount = 5;
  _feedPromotionSlideCount = 1;
  _loadedAdCount = 0;
  _pool = [[BZVNativeAd2Pool alloc] initWithUnitId:FEED_UNIT_ID];  

  // ...
}

- (void)setupCarousel {
  __weak typeof(self) weakSelf = self;
  [self.pool loadAdsWithCount:self.adRequestCount completionHandler:^(NSInteger adCount) {
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      // ...
      // 실제로 할당받은 광고의 개수(adCount)에 베네핏허브 진입 슬라이드 개수(feedPromotionSlideCount)를 더해서 cell 개수(loadedAdCount)를 설정합니다.
      strongSelf.loadedAdCount = adCount + strongSelf.feedPromotionSlideCount;
      [strongSelf.carouselCollectionView reloadData];
    }
  } errorHandler:^(NSError * _Nonnull error) {
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      // ...
      // 광고 할당이 실패했을 때, 베네핏허브 진입 슬라이드 1개가 보이도록 구성합니다.
      strongSelf.loadedAdCount = strongSelf.feedPromotionSlideCount;
      [strongSelf.carouselCollectionView reloadData];
    }
  }];
}

@end

final class CarouselViewController: UIViewController {
  // ...

  private var loadedAdCount = 0

  private lazy var carouselCollectionView: UICollectionView = {
    let collectionView = UICollectionView(frame: .zero)
    // ...
    return collectionView
  }()
  
  // ...
}

extension CarouselViewController: UICollectionViewDataSource {
  // ...

  func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    if (indexPath.item % loadedAdCount) == loadedAdCount - 1 {
      // last index인 경우 FeedPromotionCell을 반환합니다.
      guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "FeedPromotionCell", for: indexPath) as? FeedPromotionCell else {
        return UICollectionViewCell()
      }
      cell.bind()
      return cell
    } else {
      // last index가 아닌 경우 CarouselCell을 반환합니다.
      guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CarouselCell", for: indexPath) as? CarouselCell else {
        return UICollectionViewCell()
      }
      cell.setPool(with: pool, for: indexPath.item)
      cell.bind()
      return cell
    }
  }
}

@interface CarouselViewController () <UICollectionViewDelegate, UICollectionViewDataSource>

@property (nonatomic, strong, readonly) UICollectionView *carouselCollectionView;
@property (nonatomic, assign, readwrite) NSInteger loadedAdCount;

@end

@implementation CarouselViewController

// ...

#pragma mark - UICollectionViewDataSource

// ...

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
  if ((indexPath.item % _loadedAdCount) == _loadedAdCount - 1) {
    // last index인 경우 FeedPromotionCell을 반환합니다.
    FeedPromotionCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"FeedPromotionCell" forIndexPath:indexPath];
    [cell bind];
    return cell;
  } else {
    // last index가 아닌 경우 CarouselCell을 반환합니다.
    CarouselCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"CarouselCell" forIndexPath:indexPath];
    [cell setPool:_pool forAdKey:indexPath.item];
    [cell bind];
    return cell;
  }
}

@end

import UIKit
import BuzzvilSDK

final class CarouselFeedEntryView: BZVFeedEntryView {
  private lazy var button: UIButton = {
    let button = UIButton(type: .system)
    button.setTitle("포인트 더 받으러 가기", for: .normal)
    button.tintColor = .systemBlue
    return button
  }()
  
  override init(frame: CGRect) {
    super.init(frame: frame)
    setupView()
    setupLayout()
  }
  
  required init?(coder: NSCoder) {
    fatalError()
  }
  
  private func setupView() {
    addSubview(button)
    clickableViews = [button]
  }
  
  private func setupLayout() {
    button.translatesAutoresizingMaskIntoConstraints = false
    NSLayoutConstraint.activate([
      button.topAnchor.constraint(equalTo: topAnchor),
      button.leadingAnchor.constraint(equalTo: leadingAnchor),
      button.trailingAnchor.constraint(equalTo: trailingAnchor),
      button.bottomAnchor.constraint(equalTo: bottomAnchor),
    ])
  }
}

@import UIKit;
@import BuzzvilSDK;

@interface CarouselFeedEntryView: BZVFeedEntryView

@end

@interface CarouselFeedEntryView ()

@property (nonatomic, strong, readonly) UIButton *button;

@end

@implementation CustomFeedEntryView

- (instancetype)initWithFrame:(CGRect)frame {
  if (self = [super initWithFrame:frame]) {
    [self setupView];
    [self setupLayout];
  }
  return self;
}

- (void)setupView {
  _button = [[UIButton alloc] initWithFrame:CGRectZero];
  [_button setTitle:@"포인트 더 받으러 가기" forState:UIControlStateNormal];
  [_button setTitleColor:[UIColor systemBlueColor] forState:UIControlStateNormal];
  [self addSubview:_button];
  self.clickableViews = @[self.button];
}

- (void)setupLayout {
  _button.translatesAutoresizingMaskIntoConstraints = NO;
  [NSLayoutConstraint activateConstraints:@[
    [_button.topAnchor constraintEqualToAnchor:self.topAnchor],
    [_button.leadingAnchor constraintEqualToAnchor:self.leadingAnchor],
    [_button.trailingAnchor constraintEqualToAnchor:self.trailingAnchor],
    [_button.bottomAnchor constraintEqualToAnchor:self.bottomAnchor],
  ]];
}

@end

final class CarouselViewController: UIViewController {
  // ...

  private lazy var feedEntryView: CarouselFeedEntryView = {
    let view = CarouselFeedEntryView(frame: .zero)
    return view
  }()

  override func viewDidLoad() {
    super.viewDidLoad()
    setupView()
    setupLayout()
    // ...
  }

  private func setupView() {
    // ...
    view.addSubview(feedEntryView)
  }

  private func setupLayout() {
    // AutoLayout Constraints를 설정하세요.
    // ...
  }
}

@interface CarouselViewController () <UICollectionViewDelegate, UICollectionViewDataSource>

// ...
@property (nonatomic, strong, readonly) CarouselFeedEntryView *feedEntryView;

@end

@implementation CarouselViewController

- (void)viewDidLoad {
  [super viewDidLoad];
  // ...
  [self setupView];
  [self setupLayout];
  // ...
}

- (void)setupView {
  // ...
  
  _feedEntryView = [[CarouselFeedEntryView alloc] initWithFrame:CGRectZero];
  [self.view addSubview:self.feedEntryView];
}

- (void)setupLayout {
  // AutoLayout Constraints를 설정하세요.
  // ...
}

@end

final class CarouselViewController: UIViewController {
  // ...

  private lazy var carouselCollectionView: UICollectionView = {
    let collectionView = UICollectionView(frame: .zero, collectionViewLayout: flowLayout)
    // ...
    return collectionView
  }()

  private lazy var feedEntryView: CarouselFeedEntryView = {
    let view = CarouselFeedEntryView(frame: .zero)
    return view
  }()

  private lazy var pool = BZVNativeAd2Pool(unitId: unitId)

  override func viewDidLoad() {
    super.viewDidLoad()
    // ...
    setupCarousel()
  }

  // ...

  private func setupCarousel() {
    pool.loadAds(count: adRequestCount) { [weak self] adCount in
      // ...
    } errorHandler: { [weak self] error in
      self?.carouselCollectionView.isHidden = true
      self?.feedEntryView.isHidden = true
    }
  }
}

@interface CarouselViewController () <UICollectionViewDelegate, UICollectionViewDataSource>

// ...
@property (nonatomic, strong, readonly) UICollectionView *carouselCollectionView;
@property (nonatomic, strong, readonly) CarouselFeedEntryView *feedEntryView;
@property (nonatomic, strong, readonly) BZVNativeAd2Pool *pool;

@end

@implementation CarouselViewController

- (void)viewDidLoad {
  [super viewDidLoad];
  // ...
  [self setupCarousel];
}

// ...

- (void)setupCarousel {
  __weak typeof(self) weakSelf = self;
  [self.pool loadAdsWithCount:self.adRequestCount completionHandler:^(NSInteger adCount) {
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      // ...
    }
  } errorHandler:^(NSError * _Nonnull error) {
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      strongSelf.carouselCollectionView.hidden = YES;
      strongSelf.feedEntryView.hidden = YES;
    }
  }];
}

@end

final class CarouselCell: UICollectionViewCell {
  // ...

  private lazy var descriptionLabel: UILabel = {
    let label = UILabel(frame: .zero)
    label.numberOfLines = 2
    return label
  }()
  
  // ...
}

@interface CarouselCell ()

// ...
@property (nonatomic, strong, readonly) UILabel *descriptionLabel;

@end

@implementation CarouselCell

- (void)setupView {
  // ...
  _descriptionLabel = [[UILabel alloc] initWithFrame:CGRectZero];
  _descriptionLabel.numberOfLines = 2;
  // ...
}

// ...

@end

final class CarouselViewController: UIViewController {
  // ...

  private var loadedAdCount = 0

  private var infiniteItemCount: Int {
    return loadedAdCount * 1000
  }

  // ...

  private lazy var pageControl: UIPageControl = {
    let pageControl = UIPageControl(frame: .zero)
    // ...
    return pageControl
  }()

  override func viewDidLoad() {
    super.viewDidLoad()
    // ...
    setupCarousel()
  }

  // ...

  private func setupCarousel() {
    pool.loadAds(count: adRequestCount) { [weak self] adCount in
      // ...
      
      // 고유한 cell 개수를 저장합니다.
      self?.loadedAdCount = adCount 
      // 총 cell 개수를 pageControl 개수로 설정합니다.
      self?.pageControl.numberOfPages = self?.infiniteItemCount ?? adCount * 1000
    } errorHandler: { [weak self] error in
      // ...
    }
  }
}

extension CarouselViewController: UICollectionViewDataSource {
  func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return infiniteItemCount
  }
  
  // ...
}

@interface CarouselViewController () <UICollectionViewDelegate, UICollectionViewDataSource>

// ...
@property (nonatomic, assign, readwrite) NSInteger loadedAdCount;
@property (nonatomic, strong, readonly) UIPageControl *pageControl;
// ...

@end

@implementation CarouselViewController

// ...

- (NSInteger)infiniteItemCount {
  return _loadedAdCount * 1000;
}

// ...

- (void)viewDidLoad {
  [super viewDidLoad];
  // ...
  [self setupCarousel];
}

// ...

- (void)setupCarousel {
  __weak typeof(self) weakSelf = self;
  [self.pool loadAdsWithCount:self.adRequestCount completionHandler:^(NSInteger adCount) {
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      // ...

      // 고유한 cell 개수를 저장합니다.
      strongSelf.loadedAdCount = adCount;
      // 총 cell 개수를 pageControl 개수로 설정합니다.
      strongSelf.pageControl.numberOfPages = [strongSelf infiniteItemCount];
    }
  } errorHandler:^(NSError * _Nonnull error) {
    // ...
  }];
}

#pragma mark - UICollectionViewDataSource

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
  return [self infiniteItemCount];
}

// ...

@end

extension CarouselViewController: UICollectionViewDataSource {
  func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CarouselCell", for: indexPath) as? CarouselCell else {
      return UICollectionViewCell()
    }
    
    // 할당된 고유 광고 개수로 모듈러 연산하여 index를 적용합니다.
    cell.setPool(with: pool, for: indexPath.item % loadedAdCount)
    cell.bind()
    return cell
  }
}

@implementation CarouselViewController

// ...

#pragma mark - UICollectionViewDataSource

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
  CarouselCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"CarouselCell" forIndexPath:indexPath];
  
  // 할당된 고유 광고 개수로 모듈러 연산하여 index를 적용합니다.
  [cell setPool:_pool forAdKey:indexPath.item % self.loadedAdCount];
  [cell bind];
  return cell;
}

// ...

@end

final class CarouselViewController: UIViewController {
  // ...

  private var loadedAdCount = 0

  private var infiniteItemCount: Int {
    return loadedAdCount * 1000
  }

  // ...

  private lazy var carouselCollectionView: UICollectionView = {
    let collectionView = UICollectionView(frame: .zero, collectionViewLayout: flowLayout)
    // ...
    return collectionView
  }()

  private lazy var pageControl: UIPageControl = {
    let pageControl = UIPageControl(frame: .zero)
    // ...
    return pageControl
  }()

  override func viewDidLoad() {
    super.viewDidLoad()
    // ...
    setupCarousel()
  }

  // ...

  private func setupCarousel() {
    pool.loadAds(count: adRequestCount) { [weak self] adCount in
      // ...
      self?.loadedAdCount = adCount 
      self?.pageControl.numberOfPages = infiniteItemCount
      self?.carouselCollectionView.reloadData()
      self?.moveCarouselToMiddle()
    } errorHandler: { [weak self] error in
      // ...
    }
  }

  private func moveCarouselToMiddle() {
    let middleIndex = ((loadedAdCount * 1000) / 2) % loadedAdCount
    let indexPath = IndexPath(item: middleIndex, section: .zero)
    carouselCollectionView.scrollToItem(at: indexPath, at: [.centeredVertically, .centeredHorizontally], animated: false)
    pageControl.currentPage = indexPath.item
  }
}

@interface CarouselViewController () <UICollectionViewDelegate, UICollectionViewDataSource>

// ...
@property (nonatomic, assign, readwrite) NSInteger loadedAdCount;
@property (nonatomic, strong, readonly) UICollectionView *carouselCollectionView;
@property (nonatomic, strong, readonly) UIPageControl *pageControl;
// ...

@end

@implementation CarouselViewController

- (NSInteger)infiniteItemCount {
  return _loadedAdCount * 1000;
}

- (void)viewDidLoad {
  [super viewDidLoad];
  // ...
  [self setupCarousel];
}

// ...

- (void)setupCarousel {
  __weak typeof(self) weakSelf = self;
  [self.pool loadAdsWithCount:self.adRequestCount completionHandler:^(NSInteger adCount) {
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      // ...
      strongSelf.loadedAdCount = adCount;
      strongSelf.pageControl.numberOfPages = [strongSelf infiniteItemCount];
      [strongSelf.carouselCollectionView reloadData];
      [strongSelf moveCarouselToMiddle];
    }
  } errorHandler:^(NSError * _Nonnull error) {
    // ...
  }];
}

- (void)moveCarouselToMiddle {
  NSInteger middleIndex = ((self.loadedAdCount * 1000) / 2) % _loadedAdCount;
  NSIndexPath *indexPath = [NSIndexPath indexPathForItem:middleIndex inSection:0];
  [self.carouselCollectionView scrollToItemAtIndexPath:indexPath atScrollPosition:UICollectionViewScrollPositionCenteredVertically | UICollectionViewScrollPositionCenteredHorizontally animated:NO];
  _pageControl.currentPage = indexPath.item;
}

// ...

@end

final class CarouselCell: UICollectionViewCell {
  // ...
  
  private lazy var activityIndicatorView: UIActivityIndicatorView = {
    let indicator = UIActivityIndicatorView(frame: .zero)
    indicator.hidesWhenStopped = true
    return indicator
  }()
  
  override init(frame: CGRect) {
    super.init(frame: frame)
    setupView()
    setupLayout()
  }
  
  private func setupView() {
    // ...
    contentView.addSubview(activityIndicatorView)
  }
  
  private func setupLayout() {
    // ...
    
    activityIndicatorView.translatesAutoresizingMaskIntoConstraints = false
    NSLayoutConstraint.activate([
      activityIndicatorView.centerXAnchor.constraint(equalTo: centerXAnchor),
      activityIndicatorView.centerYAnchor.constraint(equalTo: centerYAnchor),
    ])
  }
  
  func setupLoading() {
    viewBinder.subscribeEvents(onRequest: { [weak self] in
      self?.activityIndicatorView.startAnimating()
      self?.nativeAd2View.alpha = 0.5
    }, onNext: { [weak self] _ in
      self?.activityIndicatorView.stopAnimating()
      self?.nativeAd2View.alpha = 1
    }, onError: { [weak self] in
      self?.activityIndicatorView.stopAnimating()
      self?.nativeAd2View.alpha = 1
      print("error: \($0)")
    }, onCompleted: { [weak self] in
      self?.activityIndicatorView.stopAnimating()
      self?.nativeAd2View.alpha = 1
      print("completed")
    })
  }
}

extension CarouselViewController: UICollectionViewDataSource {
  func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    // ...
    cell.setupLoading()
    cell.setPool(with: pool, for: indexPath.item)
    cell.bind()
    return cell
  }
}

@interface CarouselCell : UICollectionViewCell

// ...
- (void)setupLoading

@end

@interface CarouselCell ()

// ...
@property (nonatomic, strong, readonly) UIActivityIndicatorView *activityIndicatorView;

@end

@implementation CarouselCell

- (instancetype)initWithFrame:(CGRect)frame {
  self = [super initWithFrame:frame];
  if (self) {
    [self setupView];
    [self setupLayout];
  }
  return self;
}

- (void)setupView {
  // ...

  _activityIndicatorView = [[UIActivityIndicatorView alloc] initWithFrame:CGRectZero];
  _activityIndicatorView.hidesWhenStopped = YES;
  [self.contentView addSubview:_activityIndicatorView];
}

- (void)setupLayout {
  // ...
  
  _activityIndicatorView.translatesAutoresizingMaskIntoConstraints = NO;
  [NSLayoutConstraint activateConstraints:@[
    [_activityIndicatorView.centerXAnchor constraintEqualToAnchor:self.centerXAnchor],
    [_activityIndicatorView.centerYAnchor constraintEqualToAnchor:self.centerYAnchor],
  ]];
}

- (void)setupLoading {
  __weak typeof(self) weakSelf = self;
  [_viewBinder subscribeEventsOnRequest:^{
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      [strongSelf.activityIndicatorView startAnimating];
      strongSelf.nativeAd2View.alpha = 0.5;
    }
  } onNext:^(BZVNativeAd2 * _Nonnull ad) {
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      [strongSelf.activityIndicatorView stopAnimating];
      strongSelf.nativeAd2View.alpha = 1;
    }
  } onError:^(NSError * _Nonnull error) {
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      [strongSelf.activityIndicatorView stopAnimating];
      strongSelf.nativeAd2View.alpha = 1;
      NSLog(@"error: %@", error);
    }
  } onCompleted:^{
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      [strongSelf.activityIndicatorView stopAnimating];
      strongSelf.nativeAd2View.alpha = 1;
      NSLog(@"completed");
    }
  }];
}

@end

@implementation CarouselViewController

// ...

#pragma mark - UICollectionViewDataSource

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
  // ...
  [cell setupLoading];
  [cell setPool:_pool forIndex:indexPath.item];
  [cell bind];
  return cell;
}

@end

final class CarouselCell: UICollectionViewCell {
  // ...
  
  func setupEventListeners() {
    viewBinder.subscribeAdEvents(onImpressed: { [weak self] in
      print("impressed: \($0.title)")
    }, onClicked: { [weak self] in
      print("clicked: \($0.title)")
    }, onRewardRequested: { [weak self] in
      print("requested reward: \($0.title)")
    }, onRewarded: { [weak self] in
      print("received reward result: \($0.title), \($1)")
    }, onParticipated: { [weak self] in
      print("participated: \($0.title)")
    })
  }
}

extension CarouselViewController: UICollectionViewDataSource {
  func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    // ...
    cell.setupEventListeners()
    cell.setPool(with: pool, for: indexPath.item)
    cell.bind()
    return cell
  }
}

@interface CarouselCell : UICollectionViewCell

// ...
- (void)setupEventListeners;

@end

@implementation CarouselCell

// ...

- (void)setupEventListeners {
  __weak typeof(self) weakSelf = self;
  [_viewBinder subscribeAdEventsOnImpressed:^(BZVNativeAd2 * _Nonnull ad) {
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      NSLog(@"impressed: %@", ad.title);
    }
  } onClicked:^(BZVNativeAd2 * _Nonnull ad) {
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      NSLog(@"clicked: %@", ad.title);
    }
  } onRewardRequested:^(BZVNativeAd2 * _Nonnull ad) {
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      NSLog(@"requested reward: %@", ad.title);
    }
  } onRewarded:^(BZVNativeAd2 * _Nonnull ad, BZVRewardResult result) {
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      NSLog(@"received reward result: %@", ad.title);
    }
  } onParticipated:^(BZVNativeAd2 * _Nonnull ad) {
    __strong typeof(self) strongSelf = weakSelf;
    if (strongSelf) {
      NSLog(@"participated: %@", ad.title);
    }
  }];
}

@end

@implementation CarouselViewController

// ...

#pragma mark - UICollectionViewDataSource

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
  // ...
  [cell setupEventListeners];
  [cell setPool:_pool forIndex:indexPath.item];
  [cell bind];
  return cell;
}

@end

final class CarouselCell: UICollectionViewCell {
  private lazy var nativeAd2View = BZVNativeAd2View(frame: .zero)
  
  // ...

  override init(frame: CGRect) {
    super.init(frame: frame)
    // ...
    setupLayout()
    // ...
  }
  
  private func setupLayout() {
    // CarouselCell과 동일한 크기로 설정합니다.
    nativeAd2View.translatesAutoresizingMaskIntoConstraints = false
    NSLayoutConstraint.activate([
      nativeAd2View.topAnchor.constraint(equalTo: safeAreaLayoutGuide.topAnchor),
      nativeAd2View.leadingAnchor.constraint(equalTo: safeAreaLayoutGuide.leadingAnchor),
      nativeAd2View.trailingAnchor.constraint(equalTo: safeAreaLayoutGuide.trailingAnchor),
      nativeAd2View.bottomAnchor.constraint(equalTo: safeAreaLayoutGuide.bottomAnchor),
    ])

    // ...
  }
  
  // ...
}

@interface CarouselCell ()

@property (nonatomic, strong, readonly) BZVNativeAd2View *nativeAd2View;
// ...

@end

@implementation CarouselCell

- (instancetype)initWithFrame:(CGRect)frame {
  self = [super initWithFrame:frame];
  if (self) {
    // ...
    [self setupLayout];
    // ...
  }
  return self;
}

- (void)setupLayout {
  // CarouselCell과 동일한 크기로 설정합니다.
  _nativeAd2View.translatesAutoresizingMaskIntoConstraints = NO;
  [NSLayoutConstraint activateConstraints:@[
    [_nativeAd2View.topAnchor constraintEqualToAnchor:self.contentView.safeAreaLayoutGuide.topAnchor],
    [_nativeAd2View.leadingAnchor constraintEqualToAnchor:self.contentView.safeAreaLayoutGuide.leadingAnchor],
    [_nativeAd2View.trailingAnchor constraintEqualToAnchor:self.contentView.safeAreaLayoutGuide.trailingAnchor],
    [_nativeAd2View.bottomAnchor constraintEqualToAnchor:self.contentView.safeAreaLayoutGuide.bottomAnchor],
  ]];

  // ...
}

// ...

@end

final class CarouselViewController: UIViewController {
  private let spacing: CGFloat = 8
  
  // ...
  
  private lazy var flowLayout: UICollectionViewFlowLayout = {
    let flowLayout = UICollectionViewFlowLayout()
    // ...

    // flowLayout의 minimumLineSpacing을 spacing 값으로 설정합니다.
    flowLayout.minimumLineSpacing = spacing
    return flowLayout
  }()
  
  private lazy var carouselCollectionView: UICollectionView = {
    let collectionView = UICollectionView(frame: .zero, collectionViewLayout: flowLayout)
    // ...

    // isPagingEnabled를 false로 설정합니다.
    collectionView.isPagingEnabled = false
    // 아래 속성들을 설정합니다.
    collectionView.decelerationRate = .fast
    collectionView.contentInset = UIEdgeInsets(top: .zero, left: 2 * spacing, bottom: .zero, right: 2 * spacing)
    return collectionView
  }()
  
  // ...
}

@implementation CarouselViewController

- (NSInteger)spacing {
  return 8;
}

- (void)viewDidLoad {
  [super viewDidLoad];
  // ...
  [self setupView];
  // ...
}

- (void)setupView {
  UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
  flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
  // flowLayout의 minimumLineSpacing을 spacing 값으로 설정합니다.
  flowLayout.minimumLineSpacing = [self spacing];
  // ...

  _carouselCollectionView = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:flowLayout];
  // ...
  
  // isPagingEnabled를 false로 설정합니다.
  _carouselCollectionView.pagingEnabled = NO;
  // 아래 속성들을 설정합니다.
  _carouselCollectionView.decelerationRate = UIScrollViewDecelerationRateFast;
  _carouselCollectionView.contentInset = UIEdgeInsetsMake(0, 2 * [self spacing], 0, 2 * [self spacing]);
  
  // ...
}

// ...

@end

final class CarouselViewController: UIViewController {
  private let spacing = 8

  // ...

  private lazy var pageControl: UIPageControl = {
    let pageControl = UIPageControl(frame: .zero)
    // ...
    return pageControl
  }()
  
  // ...
}

// 위에서 구현했던 scrollViewDidScroll(_:)를 제거합니다.
//
//extension CarouselViewController: UICollectionViewDelegate {
//  func scrollViewDidScroll(_ scrollView: UIScrollView) {
//    let centerOffsetX = scrollView.contentOffset.x + (scrollView.frame.width / 2)
//    let pageWidth = scrollView.frame.width
//    guard pageWidth != .zero else { return }
//    pageControl.currentPage = Int(centerOffsetX / pageWidth)
//  }
//}

// 캐러셀 아이템이 화면에서 일정 부분 넘어가면 다음 아이템으로 이동하도록 구현합니다.
extension CarouselViewController: UICollectionViewDelegate {
  func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
    let cellWidth = scrollView.frame.width - (4 * spacing)
    let cellWidthWithSpace = cellWidth + spacing
    let estimatedIndex = scrollView.contentOffset.x / cellWidthWithSpace
    let index: Int
    
    if velocity.x > 0 {
      index = Int(ceil(estimatedIndex))
    } else if velocity.x < 0 {
      index = Int(floor(estimatedIndex))
    } else {
      index = Int(round(estimatedIndex))
    }
    pageControl.currentPage = index
    
    targetContentOffset.pointee = CGPoint(x: CGFloat(index) * cellWidthWithSpace - (2 * spacing), y: .zero)
  }
}

@interface CarouselViewController ()

// ...
@property (nonatomic, strong, readonly) UIPageControl *pageControl;

@end

@implementation CarouselViewController

- (NSInteger)spacing {
  return 8;
}

// ...

// 위에서 구현했던 scrollViewDidScroll(_:)를 제거합니다.
// 
//#pragma mark - UICollectionViewDelegate
//
//- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
//  CGFloat centerOffsetX = scrollView.contentOffset.x + (scrollView.frame.size.width / 2);
//  CGFloat pageWidth = scrollView.frame.size.width;
//
//  if (pageWidth == 0) {
//    return;
//  }
//  _pageControl.currentPage = (NSInteger)centerOffsetX / (NSInteger)pageWidth;
//}

#pragma mark - UICollectionViewDelegate

// 캐러셀 아이템이 화면에서 일정 부분 넘어가면 다음 아이템으로 이동하도록 구현합니다.
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset {
  CGFloat cellWidth = scrollView.frame.size.width - (4 * [self spacing]);
  CGFloat cellWidthWithSpace = cellWidth + [self spacing];
  CGFloat estimatedIndex = scrollView.contentOffset.x / cellWidthWithSpace;
  NSInteger index;
  
  if (velocity.x > 0) {
    index = (NSInteger)ceil(estimatedIndex);
  } else if (velocity.x < 0) {
    index = (NSInteger)floor(estimatedIndex);
  } else {
    index = (NSInteger)round(estimatedIndex);
  }
  _pageControl.currentPage = index;
  
  targetContentOffset->x = index * cellWidthWithSpace - (2 * [self spacing]);
  targetContentOffset->y = 0;
}

@end

final class CarouselViewController: UIViewController {
  private let spacing = 8

  // ...
}

// ...

extension CarouselViewController: UICollectionViewDelegateFlowLayout {
  func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    return CGSize(width: collectionView.frame.size.width - (4 * spacing), height: collectionView.frame.size.height)
  }
}

@implementation CarouselViewController

- (NSInteger)spacing {
  return 8;
}

// ...

#pragma mark - UICollectionViewDelegateFlowLayout

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
  return CGSizeMake(collectionView.frame.size.width - (4 * [self spacing]), collectionView.frame.size.height);
}

@end

final class CarouselViewController: UIViewController {
  // eg. spacing 값을 12로 설정합니다.
  private let spacing = 12

  // ...
}

@implementation CarouselViewController

// eg. spacing 값을 12로 설정합니다.
- (NSInteger)spacing {
  return 12;
}

// ...

@end