如何检测 AVPlayer 实际上开始在 swift 中播放 [英] How to detect AVPlayer actually started to play in swift

问题描述

您好，我已将 UISlider 最小值设置为 0.00.然后我以这种方式设置它的最大值.

Hello I have set my UISliderminimum value to 0.00. Then I set it's max value in this way.

self.viewPlayer.layer.addSublayer(playerLayer)
    let duration : CMTime = avPlayer.avPlayer.currentItem!.asset.duration
    let seconds : Float64 = CMTimeGetSeconds(duration)

    sliderBar.maximumValue=Float(seconds)
    sliderBar!.isContinuous = false
    sliderBar!.tintColor = UIColor.green

但我收到此异常

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Attempting to set a slider's minimumValue (0.000000) to be larger than the maximumValue (nan)'
enter code here

我知道在 prepareForPlay() 到实际播放之后，真正播放视频需要一些时间.那么如何检测播放器何时真正开始播放视频呢?请帮我.谢谢

I know after prepareForPlay() to actual playing it takes some time to really play the video. So how can I detect when the player really started to play the video? Please help me. Thanks

推荐答案

从 iOS 10 开始，您可以观察 AVPlayer 的 timeControlStatus 属性.它可以是 .playing.

Since iOS 10 you can observe timeControlStatus property of AVPlayer. It can be .playing.

检查代码:

private func setupAVPlayer() {
    avPlayer.addObserver(self, forKeyPath: "status", options: [.old, .new], context: nil)
    if #available(iOS 10.0, *) {
        avPlayer.addObserver(self, forKeyPath: "timeControlStatus", options: [.old, .new], context: nil)
    } else {
        avPlayer.addObserver(self, forKeyPath: "rate", options: [.old, .new], context: nil)
    }
}

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
    if object as AnyObject? === avPlayer {
        if keyPath == "status" {
            if avPlayer.status == .readyToPlay {
                avPlayer.play()
            }
        } else if keyPath == "timeControlStatus" {
            if #available(iOS 10.0, *) {
                if avPlayer.timeControlStatus == .playing {
                    videoCell?.muteButton.isHidden = false
                } else {
                    videoCell?.muteButton.isHidden = true
                }
            }
        } else if keyPath == "rate" {
            if avPlayer.rate > 0 {
                videoCell?.muteButton.isHidden = false
            } else {
                videoCell?.muteButton.isHidden = true
            }
        }
    }
}

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