UISlider無法正常使用AVPlayer

Question

我使用AVPlayer播放音頻文件。我有問題。 UISlider不能正常工作時，滑塊應移動的進度視圖，當您單擊停止當您單擊停止音頻的音頻再次播放

@IBAction func play(_ sender: Any) { 

let url = URL(string: self.urlAudio[0]) 
let playerItem = AVPlayerItem(url: url!) 
player = AVPlayer(playerItem:playerItem) 
player.rate = 1.0; 
player.play() 


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

playbackSlider.maximumValue = Float(seconds) 
playbackSlider.isContinuous = true 
playbackSlider.tintColor = UIColor.green 

playbackSlider.addTarget(self, action: #selector(ViewControllerAudioDetail.playbackSliderValueChanged(_:)), for: .valueChanged) 

if soundChange == true{ 
    playChange.setImage(UIImage(named:"Pause.png"), for: UIControlState.normal) 
    soundChange = false 
    player.play() 
} else { 
    playChange.setImage(UIImage(named:"Play.png"), for: UIControlState.normal) 
    soundChange = true 
    player.pause() 
} 

} 

func playbackSliderValueChanged(_ playbackSlider:UISlider){ 

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

player.seek(to: targetTime) 

} 

Answer 1

再次發揮

爲了切換播放並暫停檢查avplayer是否已經播放。如果玩暫停播放它。

if player.rate == 0 { 
    player.play() 
    //change your button image 
} 
else { 
    player.pause() 
    //change your button image 
} 

滑塊應移動的進度視圖

您可以使用AVPlayer的PeriodicTime觀察員更新您的滑塊進步

let _ = player.addPeriodicTimeObserver(forInterval: CMTime(seconds: 1, preferredTimescale: CMTimeScale(NSEC_PER_SEC)), queue: DispatchQueue.main) { [weak self] (time) in 
     self?.audioPlayerSlider.value = Float(CMTimeGetSeconds(time))/Float(totalDuration) 
    } 

PS：

唐不會創造球員每次用戶點擊按鈕時都會觸發。僅在玩家爲零或您想要玩不同的軌道時創建。

@IBAction func play(_ sender: Any) { 
    if player == nil { 
     let url = URL(string: self.urlAudio[0]) 
     let playerItem = AVPlayerItem(url: url!) 
     player = AVPlayer(playerItem:playerItem) 
     player.rate = 1.0; 
    } 
    if player.rate == 0 { 
     player.play() 
     //change your button image 
    } 
    else { 
     player.pause() 
     //change your button image 
    } 
} 

編輯：

我相信你正在努力尋找一種方法來擦洗/尋求到AVPlayer播放音頻的具體時間。

您可以使用AVPlayer的seek方法來做到這一點。

@IBAction func audioSliderDragged(_ sender: AnyObject) { 
     let value = self.audioPlayerSlider.value 
     let durationToSeek = Float(totalDuration) * value 
     player.seek(to: CMTimeMakeWithSeconds(Float64(durationToSeek),player.currentItem!.duration.timescale)) { [weak self](state) in 
      //do what is relevant to your app on seeing to particular offset    
     } 
}