UI 中的 AVPlayer 播放声音但不显示视频

Question

我有一个UICollectionViewController，其中包含水平滚动的全屏单元格。每个单元格中是另一个垂直滚动的集合视图。集合视图的标题单元格具有从 URL 中提取视频的 AVPlayer 。目前仅播放音频，但视频不播放。

下面的AVPlayer设置和观察器与我在UICollectionViewCell之外的应用程序内多次使用的代码相同，没有问题。播放器帧大小会签出，音频会按预期播放和循环播放，因此观察器似乎正在正确触发。

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()
}

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

提前谢谢。

Answer 1

我遇到了非常相似的问题。填充内容后，尝试将AVPlayerLayer的框架设置为所需大小的CGRect()。此外，您可能还想为您的didSet进行Dispatch.Queue异步调用。