Question

我有一个UICollectionViewController，其中全屏单元格可以水平滚动。在每个单元格内是另一个垂直滚动的collectionView。 collectionView的标题单元格有一个AVPlayer从URL中提取视频。目前只播放音频，但视频不播放。

以下AVPlayer设置和观察者的代码与我在UICollectionViewCell之外的应用程序中使用过的许多其他代码没有问题。播放器帧大小检出，音频按预期播放和循环，因此观察者似乎正在触发。

相关代码：

var post: Post! {
    didSet {
        videoURL = URL(string: post.videoURL)
        setupVideoObservers()
    }
}

var videoURL: URL! {
    didSet {
        videoPlayer = AVPlayer(url: videoURL!)
    }
}

@objc dynamic var videoPlayer: AVPlayer!

var videoPlayerLayer: AVPlayerLayer!

let videoContainerView = UIView()


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

    setupCell()
}


func setupCell() {
    addSubview(videoContainerView)
    videoContainerView.anchor(top: topAnchor,
                              right: rightAnchor,
                              bottom: bottomAnchor,
                              left: leftAnchor)

    videoPlayerLayer = AVPlayerLayer(player: videoPlayer)
    videoPlayerLayer.frame = frame
    videoPlayerLayer.videoGravity = .resizeAspectFill

    videoContainerView.layer.addSublayer(videoPlayerLayer)
}

func setupVideoObservers() {
    addObserver(self, forKeyPath: "videoPlayer.currentItem.status", options: .new, context: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(playerReachedEndOfVideo(notification:)), name: .AVPlayerItemDidPlayToEndTime, object: videoPlayer.currentItem)
    NotificationCenter.default.addObserver(self, selector: #selector(appWillEnterForegroundNotification), name: .UIApplicationWillEnterForeground, object: videoPlayer.currentItem)
}

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey: Any]?, context: UnsafeMutableRawPointer?) {
    if keyPath == "videoPlayer.currentItem.status" {
        videoPlayer.play()
    }
}

@objc func playerReachedEndOfVideo(notification: NSNotification) {
    let seekTime = CMTime(seconds: 0, preferredTimescale: 1000)
    videoPlayer.seek(to: seekTime, toleranceBefore: kCMTimeZero, toleranceAfter: kCMTimeZero)
    videoPlayer.play()
}

@objc func appWillEnterForegroundNotification() {
    videoPlayer.play()
}

我遇到的没有视频的AVPlayer音频问题的所有其他SO解决方案都没有应用。如果有人有任何见解，我们将不胜感激。

提前致谢。

Answer 1

我有一个非常类似的问题。在填充内容后，尝试将AVPlayerLayer的框架设置为所需尺寸的CGRect()。您也可以为Dispatch.Queue进行didSet异步调用。

UICollectionViewCell中的AVPlayer播放声音但不显示视频

1 个答案: