从收藏视图切换视频时，Swift 播放器冻结但音频仍然在后台运行

Posted 2023-03-09

【中文标题】从收藏视图切换视频时，Swift 播放器冻结但音频仍然在后台运行

【英文标题】：Swift player freezes but audio still works in background when switching videos from collection view

【发布时间】：2018-03-05 02:05:18

【问题描述】：

这是我的意思的快速视频：https://youtu.be/Ld8apahZBIg

我有一个收藏视图，当我点击任何第一个视频播放时，它会完美显示。当我单击返回关闭播放器/视图以播放不同的视频时，音频在后台运行，但在播放视频时视频显示似乎冻结。

这是 UICollectionView 的相关代码：

class HomeController: UICollectionViewController, UICollectionViewDelegateFlowLayout 

       override func viewDidLoad() 
    super.viewDidLoad()
         collectionView?.register(HomePostCell.self, forCellWithReuseIdentifier: cellId)

    collectionView?.register(HomeControllerHeader.self, forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, withReuseIdentifier: "HomeControllerHeaderId")
   

override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int 
    return posts.count


func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat 
    return 1


func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat 
    return 1


override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell 
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! HomePostCell
    //        self.hpc = cell
    cell.post = posts[indexPath.item]
    return cell
 

var avPlayerViewController = VideoPlayerViewController()

var avPlayer = AVPlayer()
var playerLayer: AVPlayerLayer!

override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) 
    let links = posts[indexPath.row]
    guard let url = NSURL(string: links.videoUrl) else  return 
    var player = avPlayerViewController.player
    player = AVPlayer(url: url as URL)
    let playerItem = AVPlayerItem(url: url as URL)
    avPlayer.replaceCurrentItem(with: playerItem)
    let playerController = avPlayerViewController
    playerController.player = player

self.navigationController?.pushViewController(playerController, animated: true)
        playerController.player.play()

      

这是我的 avPlayer View Controller 类的相关代码：

class VideoPlayerViewController: UIViewController 
    var player: AVPlayer!
    var playerLayer: AVPlayerLayer!

    let videoView: UIView = 
       let vidView = UIView()
       return vidView
    ()

    override func viewDidLoad() 
        super.viewDidLoad()

        playerLayer = AVPlayerLayer(player: player)

        videoView.layer.addSublayer(playerLayer)

        view.addSubview(videoView)

        videoView.anchor(top: view.topAnchor, left: view.leftAnchor, bottom: view.bottomAnchor, right: view.rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 0)
    

    override func viewDidAppear(_ animated: Bool) 
        super.viewDidAppear(true)
        playerLayer.frame = view.bounds
        self.view.layer.addSublayer(playerLayer)
        player!.play()
    

    override func viewDidLayoutSubviews() 
        super.viewDidLayoutSubviews()
        playerLayer.frame = view.bounds
    

    override func viewDidDisappear(_ animated: Bool) 
        player!.pause()
        player = nil
        playerLayer.removeFromSuperlayer()
    

如果您还有其他问题，请告诉我。

【问题讨论】：

"我有一个集合视图" 你的代码中没有一行建议这样做。

@ElTomato 好的，我添加了集合视图类

【参考方案1】：

修复它。问题是我正在调用播放器来显示视频一次。每次我尝试删除子层并播放新视频时，视频播放器都会冻结，因为会发生这种情况，因为播放器层只会加载一次，然后当尝试播放新的播放器层时它不会因为它需要再次加载.每次显示视图控制器时，我都使用 viewDidAppear 加载内容。

class VideoPlayerViewController: UIViewController 


var hc: HomeController!
var player: AVPlayer!
var playerLayer: AVPlayerLayer!

let videoView: UIView = 
   let vidView = UIView()
   return vidView
()

override func viewDidLoad() 
    super.viewDidLoad()
    view.backgroundColor = .black


override func viewDidAppear(_ animated: Bool) 
    super.viewDidAppear(true)
    playerLayer = AVPlayerLayer(player: player)
    view.addSubview(videoView)
    videoView.anchor(top: view.topAnchor, left: view.leftAnchor, bottom: view.bottomAnchor, right: view.rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 0)
    self.view.layer.addSublayer(playerLayer)
    playerLayer.frame = view.bounds
    player!.play()


override func viewDidDisappear(_ animated: Bool) 
    player!.pause()
    player = nil
    playerLayer.removeFromSuperlayer()

【讨论】：

嗨，我正在使用collectionviewcell面临同样的问题有什么帮助吗？