static NSString * const reuseIdentifier = @"featureCell";

• (instancetype)init
  {

  // 流水布局
  UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];

  // 设置cell的尺寸
  layout.itemSize = [UIScreen mainScreen].bounds.size;

  // 设置每一行的间距
  layout.minimumLineSpacing = 0;

  // 设置每个cell的间距
  layout.minimumInteritemSpacing = 0;

  // 设置滚动方向
  layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;

  return [self initWithCollectionViewLayout:layout];
  }

• (void)viewDidLoad {
  [super viewDidLoad];

  [self setUpCollectionView];

}

// 初始化CollectionView

• (void)setUpCollectionView
  {
  // 注册cell
  [self.collectionView registerNib:[UINib nibWithNibName:NSStringFromClass([GPNewFeatureCell class]) bundle:nil] forCellWithReuseIdentifier:reuseIdentifier];
  // 取消弹簧效果
  self.collectionView.bounces = NO;

  // 取消显示指示器
  self.collectionView.showsHorizontalScrollIndicator = NO;

  // 开启分页模式
  self.collectionView.pagingEnabled = YES;

}

pragma mark <UICollectionViewDataSource>

• (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
  return 5;
  }

• (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {

  GPNewFeatureCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];

  NSString *imageName = [NSString stringWithFormat:@"newfeature_0%ld_736",indexPath.item + 1];
  cell.image = [UIImage imageNamed:imageName];

  return cell;
  }

pragma mark <UICollectionViewDelegate>

• (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
  {
  if (indexPath.row == 4) {

    // 切换窗口的根控制器进行跳转
    
    [UIApplication sharedApplication].keyWindow.rootViewController = [[GPAdViewController alloc]init];
    
    CATransition *anim = [CATransition animation];
    anim.type = @"rippleEffect";
    anim.duration = 1;
    [[UIApplication sharedApplication].keyWindow.layer addAnimation:anim forKey:nil];
  

  }

}