斯威夫特3：AVAudioPlayer沒有播放聲音

Question

我在它與我的音頻播放器的結構體：

struct MT_Audio { 

    func playAudio(_ fileName:String, _ fileExtension:String, _ atVolume:Float) { 
     var audioPlayer = AVAudioPlayer() 
     if let audioPath = Bundle.main.path(forResource: fileName, ofType: fileExtension) { 
      let audioURL = URL(string:audioPath) 
      do { 
       audioPlayer = try AVAudioPlayer(contentsOf: audioURL!) 
       audioPlayer.volume = atVolume 
       audioPlayer.prepareToPlay() 
       audioPlayer.play() 
      } catch { 
       print(error) 
      } 
     } 
    } 
} 

//I'm calling it in viewDidLoad like this: 

    guard let fileURL = Bundle.main.url(forResource:"heartbeat-01a", withExtension: "mp3") 
     else { 
       print("can't find file") 
       return 
      } 

     let myAudioPlayer = MT_Audio() //<--RESOLVED THE ISSUE BY MAKING THIS A PROPERTY OF THE VIEWCONTROLLER 
     myAudioPlayer.playAudio("heartbeat-01a", "mp3", 1.0) 

因爲它不和好如初的，我知道該文件的後衛是存在的。在嘗試之後，我也提出了一個突破點，並且我正在接觸音頻播放器。當我去實際的文件，並在Xcode中點擊它播放。這在模擬和設備上都會失敗。任何幫助，將不勝感激。

Answer 1

看起來像你的audioPlayer只存儲在你的playAudio功能。

儘量保持audioPlayer因爲這樣你的類內的變量：

struct MT_Audio { 

    var audioPlayer: AVAudioPlayer? 

    mutating func playAudio(_ fileName:String, _ fileExtension:String, _ atVolume:Float) { 

     // is now member of your struct -> var audioPlayer = AVAudioPlayer() 
     if let audioPath = Bundle.main.path(forResource: fileName, ofType: fileExtension) { 
      let audioURL = URL(string:audioPath) 
      do { 
       let audioPlayer = try AVAudioPlayer(contentsOf: audioURL!) 
       audioPlayer.volume = atVolume 
       audioPlayer.prepareToPlay() 
       audioPlayer.play() 
      } catch { 
       print(error) 
      } 
     } 
    } 
}