連續播放多個音頻文件

Question

我在主StoryBoard上設置了4個UIButtons。

我想「Button4」實現連續的其他三個按鈕的方法。 （首先，播放音頻文件並設置選定的「Button1」，然後「Button2」，然後「Button3」）

然而，「Button2」和「Button3」同時播放。

  fileprivate var player1:AVAudioPlayer? 
      fileprivate var player2:AVAudioPlayer? 
      fileprivate var player3:AVAudioPlayer? 

      let url1 = Bundle.main.bundleURL.appendingPathComponent("music1.mp3") 
      let url2 = Bundle.main.bundleURL.appendingPathComponent("music2.mp3") 
      let url3 = Bundle.main.bundleURL.appendingPathComponent("music3.mp3") 

      @IBAction func pushButton1(sender: UIButton) { 
       Player(url: url1) 
      } 

      @IBAction func pushButton2(sender: UIButton) { 
       Player1(url: url2) 
      } 

      @IBAction func pushButton3(_ sender: UIButton) { 
       Player2(url: url1, url2: url2, url3: url3) 
      } 


      func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) { 
       if (player === player1) { 
        yourButton.isSelected = false 
       } else if (player === player2) { 
        yourButton2.isSelected = false 
       } else if (player === player3) { 
        yourButton.isSelected = false 
        player2!.play() 
        yourButton2.isSelected = true 
        player2!.play() 
        yourButton3.isSelected = true 
        player1!.play() 
       } 
      } 

      func Player(url: URL) { 
       do { 
        try player1 = AVAudioPlayer(contentsOf:url) 
        player1!.play() 
        yourButton.isSelected = true 
        player1!.delegate = self 
       } catch { 
        print(error) 
       } 
      } 

      func Player1(url: URL) { 
       do { 
        try player2 = AVAudioPlayer(contentsOf:url) 
        player2!.play() 
        yourButton2.isSelected = true 
        player2!.delegate = self 

       } catch { 
        print(error) 
       } 
      } 

      func Player2(url: URL, url2: URL, url3: URL) { 
       do { 
        try player3 = AVAudioPlayer(contentsOf:url) 
        try player2 = AVAudioPlayer(contentsOf: url2) 
        try player1 = AVAudioPlayer(contentsOf: url3) 
        player3!.play() 
        yourButton.isSelected = true 
        player3!.delegate = self 
        player2!.delegate = self 
        player1!.delegate = self 
       } catch { 
        print(error) 
       } 
      } 

Answer 1

我相信，當你按下按鈕4，播放器1，應首先播放時，該玩家2後該玩家3.對於此任務後，下面的代碼應該工作。

let url1 = Bundle.main.bundleURL.appendingPathComponent("music1.mp3") 
let url2 = Bundle.main.bundleURL.appendingPathComponent("music2.mp3") 
let url3 = Bundle.main.bundleURL.appendingPathComponent("music3.mp3") 

func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) { 
    if (player === player1) { 
     yourButton.isSelected = false 
     yourButton2.isSelected = true 
     do { 
      //initialise player 2 
      player2 = try AVAudioPlayer(contentsOf: url2) 
      player2!.delegate = self 
     }catch { 

     } 
     player2!.play() 
    } else if (player === player2) { 
     yourButton3.isSelected = true 
     yourButton2.isSelected = false 
     do { 
      //initialise player 3 
      player3 = try AVAudioPlayer(contentsOf: url3) 
      player3!.delegate = self 
     }catch { 

     } 
     player3!.play() 
    } else if (player === player3) { 
     yourButton3.isSelected = false 
    } 
}