Question

我在player.status上使用KVO的实现很像记录here的建议。

以下是相关位：

var player: AVPlayer?
var url = URL(string: "some video url")!

override func viewDidLoad() {
    super.viewDidLoad()

    initializeVideoPlayer()
}

func initializeVideoPlayer() {
    let playerItem = AVPlayerItem(url: url)
    self.player = AVPlayer(playerItem: playerItem)
    let playerLayer = AVPlayerLayer(player: player)

    playerLayer.frame = self.view.layer.bounds
    videoView.layer.addSublayer(playerLayer)

    player?.addObserver(self, forKeyPath: "status", options: .new, context: nil)
}

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
    if keyPath == "status" {
        if player?.status == .readyToPlay {
            print(player?.currentItem?.duration)
            print(CMTimeGetSeconds((player?.currentItem?.duration)!))

//          let videoLength = CMTimeGetSeconds((player?.currentItem?.duration)!)
//          videoProgressSlider.maximumValue = Float(videoLength)
        }
    }
}

尽管状态如此，但返回的内容仍然是NaN。

解决方案：

因此，我注意到AVPlayer和AVPlayerItem都具有状态属性。通过KVO获取AVPlayerItem.status属性而不是像我所做的AVPlayer.status，持续时间将正确返回。

Answer 1

所以他注意到AVPlayer和AVPlayerItem都有状态属性。通过KVO'ing AVPlayerItem.status属性而不是像我所做的AVPlayer.status，持续时间将正确返回。

即使在player.status == .readyToPlay之后，AVPlayerItem.duration也会返回NaN

1 个答案: