objective-c - AVPlayer 显示缓存数据

Question

如何从 AVPlayer 在 UISlider 中显示缓存的数据？我用 AVPlayer 从网络播放音频，我想显示下载的数据。

Answer 1

如评论中所述 - 有一种方法可以从 avplayer 获取时间范围，显示从远程 URL 下载了多少数据。

AVPlayer 串流进度

Answer 2

您应该观察播放器的 currentItem 的属性 loadedTimeRanges。像这样：

guard let currentItem = self.player?.currentItem else {return}
currentItem.addObserver(self, forKeyPath: "loadedTimeRanges", options: NSKeyValueObservingOptions.New, context: nil)

然后实现功能：

observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>)  {
    guard object is AVPlayerItem else {return}
    let item = object as! AVPlayerItem
    if keyPath == "loadedTimeRanges" {
        let array = item.loadedTimeRanges
        guard let timeRange = array.first?.CMTimeRangeValue else {return}
        let totalBuffer = CMTimeGetSeconds(timeRange.start) + CMTimeGetSeconds(timeRange.duration)
        tmpTime = CGFloat(tmpTime)
        print("totalBuffer - \(totalBuffer)")
        let tmpProgress = tmpTime / playDuration
        progressCallBack?(tmpProgress: Float(tmpProgress), playProgress: nil)
    }
}