swift - Avplayer总是从头开始

Question

我试图让 Avplayer 从停止的地方恢复，通过创建 CMtime 类型的全局值并存储当前时间，然后使用它从停止的地方恢复

我的代码:

 override func viewDidLoad() {
      super.viewDidLoad()      

             url = URL(string: "https://s3.amazonaws.com/kargopolov/kukushka.mp3")!
            let playerItem:AVPlayerItem = AVPlayerItem(url: url as URL)
            player = AVPlayer(playerItem: playerItem)


            let duration : CMTime = playerItem.asset.duration
            let seconds : Float64 = CMTimeGetSeconds(duration)

            playbackSlider!.maximumValue = Float(seconds)

            playbackSlider?.addTarget(self, action: #selector(playbackSliderValueChanged(_:)), for: .valueChanged)
            self.view.addSubview(playbackSlider!)


            player!.addPeriodicTimeObserver(forInterval: CMTimeMakeWithSeconds(1, 1), queue: DispatchQueue.main) { (CMTime) -> Void in
                if player!.currentItem?.status == .readyToPlay {
                    let time : Float64 = CMTimeGetSeconds(player!.currentTime())

                    self.playbackSlider!.value = Float (time) }}


 @IBAction func playbackSliderValueChanged(_ sender: UISlider) {

        let seconds : Int64 = Int64(playbackSlider.value )
        let targetTime:CMTime = CMTimeMake(seconds, 1)

        player!.seek(to: targetTime)

        if player!.rate == 0
        {
            player?.play()
        }

    }

当我尝试使用seek(to:)一切都没有改变，一切都从头开始!

我尝试使用

更改当前时间

   if let currentTime = player?.currentTime() {
      player?.seek(to: times2!  )
   }

我不知道为什么总是从头开始我正在使用 AVAudioPlayer，它比 AVplayer 容易得多但因为我需要流音频，我将其更改为 AVplayer

Answer 1

我找到了解决方案，

1. 我使用此代码从 CMtime 获得了几秒钟，并将其添加到 Unwind segue 函数

    let t1 = Float((player?.currentTime().value)!)
   let t2 = Float((player?.currentTime().timescale)!)
   times2 = t1 / t2 
   // time2 is a global value of  type float
   
   nameOfTheAudioWasPlaying = Array[SelectedRow].Title!     // nameOfTheAudioWasPlaying is also a global value of type String
   

2.在viewdidload中我使用这段代码

    if Array[SelectedRow].Title! ==  nameOfTheAudioWasPlaying {
        player?.seek(to: CMTimeMakeWithSeconds(Float64(times2), 1) )
        player?.play()


    }else {
        player?.play()

    }

这是一个解决方案，但不是一个完美的解决方案，每次它重新下载音频文件以恢复它，这意味着如果我播放一个文件然后我返回到桌面 View 然后返回，它会钱包并等待几秒钟然后播放从它停止的地方开始。