AVPlayer 向后搜索时不更新 currentPlaybackTime

AVPlayer does not update currentPlaybackTime when seeking backwards

我有一个 NSTimer 设置,每 0.1 秒触发一次,在回调中我获取 currentTime() 并使用它来更新带有视频持续时间的标签。

当我向前搜索时,通过将rate设置为3,此计时器保持同步,但是当我将速率设置为-3时,视频保持同步,但currentTime()仍然returns 与我开始搜索时相同的值。这种情况会发生,直到我停止寻找然后 currentTime() returns 正确的时间

如何获取视频的当前时间,这在向后搜索时有效?

编辑: 这是我使用的代码(从 Xamarin C# 翻译而来):

class VideoPlayer: UIView {

    var player: AVPlayer!
    var wasPaused: Bool!

    func play(url: String) {
        // set the URL to the Video Player
        let streamingURL: NSURL = NSURL(string: url)!
        player = AVPlayer(URL: streamingURL)
        let playerLayer = AVPlayerLayer(layer: player)
        layer.insertSublayer(playerLayer, atIndex: 0)

        // Reset the state
        player.seekToTime(CMTime(seconds: 0, preferredTimescale: 600))

        // Start a timer to move the scrub label
        NSTimer(timeInterval: 0.1, target: self, selector: #selector(playbackTimeUpdated), userInfo: nil, repeats: true)
    }

    func playbackTimeUpdated() {
        // This one is not correct when seeking backwards
        let time = player.currentTime().seconds;

        // Use the time to adjust a UIProgressView
    }

    // Gets called when the reverse button is released
    func reverseTouchUp() {
        player.rate = 1
    }

    // Gets called when the reverse button is pressed
    func reverseTouchDown()
    {
        player.rate = -3;
    }
}

尝试 CMTimeGetSeconds(player.currentTime()) 而不是 player.currentTime().seconds。它对我有用。

还要检查你的计时器是否真的 运行(例如向它添加 NSLog 调用),也许你只是阻塞了它的线程。