斯威夫特3：AVAudioPlayer没有播放声音

Question

我在它与我的音频播放器的结构体：

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) 

因为它不和好如初的，我知道该文件的后卫是存在的。在尝试之后，我也提出了一个突破点，并且我正在接触音频播放器。当我去实际的文件，并在Xcode中点击它播放。这在模拟和设备上都会失败。任何帮助，将不胜感激。

Answer 1

看起来像你的audioPlayer只存储在你的playAudio功能。

尽量保持audioPlayer因为这样你的类内的变量：

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) 
      } 
     } 
    } 
}