背景音乐重叠的viewController

Question

当回制作者我有一个游戏，其包括3个视图控制器：

• 的viewController
• settingViewController
• GameViewController

我已经设置的背景音乐和在viewController类中播放它

var backgroundMusic : AVAudioPlayer! 
func setUpSounds(){ 
     //button sound 
     if let buttonSoundPath = NSBundle.mainBundle().pathForResource("buttonClick", ofType: "mp3") { 
      let buttonSoundURL = NSURL(fileURLWithPath: buttonSoundPath) 
      do { 
       try buttonSound = AVAudioPlayer(contentsOfURL: buttonSoundURL) 
      }catch { 
       print("could not setup button sound") 
      } 
      buttonSound.volume = 0.5 
     } 
     //background sound 
     if let backgroundMusicPath = NSBundle.mainBundle().pathForResource("BackgroundMusic", ofType: "mp3") { 
      let backgroundMusicURL = NSURL(fileURLWithPath: backgroundMusicPath) 
      do { 
       try backgroundMusic = AVAudioPlayer(contentsOfURL: backgroundMusicURL) 
      }catch { 
       print("could not setup background music") 
      } 
      backgroundMusic.volume = 0.2 
      /* 
      set any negative integer value to loop the sound 
      indefinitely until you call the stop method 
      */ 
      backgroundMusic.numberOfLoops = -1 
     } 
    } 


override func viewDidLoad() { 
     super.viewDidLoad() 
     self.setUpSounds() 
     self.playBackgroundSound() 
     // Do any additional setup after loading the view, typically from a nib. 
    } 

当我移动到settingViewController然后再回到viewController的声音重放和重叠旧的播放音乐。

这个问题的解决方案是什么？

Answer 1

您必须先检查AVAudioPlayer是否正在播放音乐，然后致电playBackgroundSound。

您还可以将SoundManager作为单件使用，以便从应用程序的其他部分操纵它。

class SoundManager{ 
     static var backgroundMusicSharedInstance = AVAudioPlayer? 
    } 

---

在查看

func setUpSounds(){ 
      //background sound 

     if SoundManager.backgroundMusicSharedInstance == nil { 
      if let backgroundMusicPath = NSBundle.mainBundle().pathForResource("BackgroundMusic", ofType: "mp3") { 
       let backgroundMusicURL = NSURL(fileURLWithPath: backgroundMusicPath) 
       do { 
        try SoundManager.backgroundMusicSharedInstance = AVAudioPlayer(contentsOfURL: backgroundMusicURL) 
       }catch { 
        print("could not setup background music") 
       } 
       SoundManager.backgroundMusicSharedInstance!.volume = 0.2 
       /* 
       set any negative integer value to loop the sound 
       indefinitely until you call the stop method 
       */ 
       SoundManager.backgroundMusicSharedInstance!.numberOfLoops = -1 
      } 
     } 
} 


    override func viewDidLoad() { 
      super.viewDidLoad() 
      self.setUpSounds() 
      if SoundManager.backgroundMusicSharedInstance!.playing == false{ 
        self.playBackgroundSound() 
       }  
    }