[英]Best way to prevent AVPlayer playing more than one track at a time
我正在使用AVPlayer播放流音频,并希望防止它一次播放多个音频轨道。 最好的方法是什么? 我的方法完全是编程的-我不使用情节提要。 将网址发送到ViewController(VC,委托)时,它会设置播放器的新实例-我认为这是问题所在,但我不确定。 谢谢。
//this routine returns the url from control to the VC (delegate)
func selectedAudio(_ audioUrl:String?) {
if let urlString = audioUrl {
setupPlayer(urlString)
}
}
//single button which toggles between play/pause
func playOrPauseTouched() {
if isPlaying {
pausePlayer()
} else {
playPlayer()
}
}
func playPlayer() {
if player == nil || selectedTrackName != currentTrackLabel.text{
if let urlString = selectedAudioUrl {
setupPlayer(urlString)
currentTrackLabel.text = "Playing: \(selectedTrackName ?? "")"
}
}
player?.play()
isPlaying = true
playPauseButton.setImage(UIImage(named: "pause"), for: .normal)
activityIndicatorView.startAnimating()
}
func pausePlayer() {
player?.pause()
isPlaying = false
playPauseButton.setImage(UIImage(named: "play"), for: .normal)
}
func setupPlayer(_ urlString:String) {
if let url = URL(string:urlString) {
player = AVPlayer(url: url)
let playerLayer = AVPlayerLayer(player: player)
player?.addObserver(self, forKeyPath: "currentItem.loadedTimeRanges", options: .new, context: nil)
let interval = CMTime(value: 1, timescale: 5) //gives smooth thumb movement w/short clips
player?.addPeriodicTimeObserver(forInterval: interval, queue: DispatchQueue.main, using: { (progressTime) in
let seconds = CMTimeGetSeconds(progressTime)
let secondsString = String(format: "%02d", Int(seconds.truncatingRemainder(dividingBy: 60)))
let minutesString = String(format: "%02d", Int(seconds / 60))
self.currentTimeLabel.text = "\(minutesString):\(secondsString)"
if let duration = self.player?.currentItem?.duration {
let durationSeconds = CMTimeGetSeconds(duration)
self.audioSlider.value = Float(seconds / durationSeconds)
}
})
}
}
我的意见是使用KVO
,它将通知您AVPlayerItem
当前状态。
意味着你会得到state
,这将帮助您识别当前项目正在播放,推,缓冲或完成打。
因此,您应该选择一个可以处理当前项目state
flag
。
防爆。
if flag == false
然后开始播放另一个项目,否则不播放。 第二种方式:
如下所示使用NotificationCenter
NotificationCenter.default.addObserver(self, selector: Selector(("playerDidFinishPlaying:")),
name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: player.currentItem)
项目播放完毕后,以下自动呼叫
func playerDidFinishPlaying(note: NSNotification) {
print("Item finished playing ")
// Set flag here
}
与托管标志相同。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.