如何使用 Loader 在 UICollectionViewcell 中显示 AVPlayer

Question

我需要在具有加载视图（活动指示器）的 CollectionviewCell 中显示 Avplayer。 下面是我尝试的代码

UIcollectionViewCell：-单元格内容视图包含视图和一些按钮（如，评论，分享）我需要显示 avplayer.Videodict 是字典数组。

每次滚动时，我都会调用 web 服务获取另一个字典并附加到 VideoDict

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
{
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! UICollectionViewCell
    
    let playerView = cell.contentView.viewWithTag(1)
    
    player = AVPlayer(url: URL(string: videodict[indexPath.item]["vid_url"] as! String)!)
    playerLayer = AVPlayerLayer(player: player)
    playerLayer?.frame = cell.contentView.frame
    playerLayer?.videoGravity = .resizeAspectFill
    playerView!.layer.addSublayer(playerLayer!)
    player?.currentItem!.addObserver(self, forKeyPath: "“timeControlStatus”", options: [.old, .new], context: nil)
    player?.play()
    return cell
 }

观察者法

override public func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?)
{
    if keyPath == "timeControlStatus", let change = change, let newValue = change[NSKeyValueChangeKey.newKey] as? Int,let oldValue = change[NSKeyValueChangeKey.oldKey] as? Int
    {
        let oldStatus = AVPlayer.TimeControlStatus(rawValue: oldValue)
        let newStatus = AVPlayer.TimeControlStatus(rawValue: newValue)
        if newStatus != oldStatus
        {
            DispatchQueue.main.async {[weak self] in
                if newStatus == .playing || newStatus == .paused
                {
                    LoaderView.show()
                }
                else
                {
                    LoaderView.hide()
                }
            }
        }
    }
}

视频正在 CollectionViewCell 中播放，但 ObserverValue Function 没有调用 & 是在收藏视图中播放视频的最佳方式。

Answer 1

尝试观察timeControlStatus如下：

    var timeControlStatusObserver: NSKeyValueObservation?
    timeControlStatusObserver = self.avPlayer.observe(\.timeControlStatus, options: [.new, .initial], changeHandler: {[weak self] (player, status) in
        if let self = self,let status = status.newValue {
            switch status {
            case .paused:
                print("status paused")
            case .waitingToPlayAtSpecifiedRate:
                print("status waitingToPlayAtSpecifiedRate")
            case .playing:
                print("status playing")
            @unknown default:
                print("status unknown")
            }
        }
    })

在 deinit 中deinit class 后，不要忘记调用timeControlStatusObserver.invalidate() 。