Swift如何使用CollectionView如何实现广告栏滑动效果

//cell重用标识
private let reuseIdentifier = "reuseIdentifier"
class PlayCollectionViewController: UICollectionViewController {

 //页面个数
 private let pageCount = 6
 //布局对象(自定义布局)
 private var layout: UICollectionViewFlowLayout = PlayLayout()

 init() {
  super.init(collectionViewLayout: layout)
 }

 required init?(coder aDecoder: NSCoder) {
  fatalError("init(coder:) has not been implemented")
 }

 override func viewDidLoad() {
  super.viewDidLoad()

  //注册cell
  collectionView?.registerClass(NewfearureCell.self, forCellWithReuseIdentifier: reuseIdentifier)
 }

 //MARK: - UICollectionDataSource
 override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
  return pageCount
 }

 override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {

  let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! NewfearureCell
  cell.imageIndex = indexPath.item
  return cell
 }
}

//MARK: - 在这里我们依然在(PlayCollectionViewController.swift的文件中)自定义collectionViewCell
class NewfearureCell: UICollectionViewCell {

 //保存图片索引
 private var imageIndex:Int? {
  didSet {
   //根据页码创建图片名字(需要每张图片的名称只有最有最有一个数不同)
   iconView.image = UIImage(named: "image_\(imageIndex!)")
  }
 }

 override init(frame: CGRect) {
  super.init(frame: frame)

  //初始化UI
  setupUI()
 }
 required init?(coder aDecoder: NSCoder) {
  fatalError("init(coder:) has not been implemented")
 }

 private func setupUI() {

  //添加子控件到contentView
  contentView.addSubview(iconView)
  //布局子控件位置(填充屏幕)
  iconView.xmg_Fill(contentView)
 }

 //MARK: 懒加载
 private lazy var iconView = UIImageView()
}

private class PlayLayout: UICollectionViewFlowLayout {

 //重写系统准备布局的方法
 override func prepareLayout() {

  //设置layout布局
  itemSize = UIScreen.mainScreen().bounds.size
  minimumInteritemSpacing = 0
  minimumLineSpacing = 0
  scrollDirection = UICollectionViewScrollDirection.Horizontal

  //设置其他属性
  collectionView?.showsHorizontalScrollIndicator = false
  collectionView?.bounces = false
  collectionView?.pagingEnabled = true
 }
}