MPMusicPlayerControllerNotification

gistfile1.swift

  
  func initializePlayerNotification() {
    myMusicPlayer!.beginGeneratingPlaybackNotifications()
    
    /* Get notified when the state of the playback changes */
    NSNotificationCenter.defaultCenter().addObserver(self,
      selector: "musicPlayerStateChanged:",
      name: MPMusicPlayerControllerPlaybackStateDidChangeNotification,
      object: nil)
    
    /* Get notified when the playback moves from one item
    to the other. In this recipe, we are only going to allow
    our user to pick one music file */
    NSNotificationCenter.defaultCenter().addObserver(self,
      selector: "nowPlayingItemIsChanged:",
      name: MPMusicPlayerControllerNowPlayingItemDidChangeNotification,
      object: nil)
    
    /* And also get notified when the volume of the
    music player is changed */
    NSNotificationCenter.defaultCenter().addObserver(self,
      selector: "volumeIsChanged:",
      name: MPMusicPlayerControllerVolumeDidChangeNotification,
      object: nil)
  }
  
  func musicPlayerStateChanged(notification: NSNotification){
    
    println("Player State Changed")
    
    /* Let's get the state of the player */
    let stateAsObject =
    notification.userInfo!["MPMusicPlayerControllerPlaybackStateKey"]
      as? NSNumber
    
    if let state = stateAsObject{
      
      /* Make your decision based on the state of the player */
      switch MPMusicPlaybackState(rawValue: state.integerValue)!{
      case .Stopped:
        /* Here the media player has stopped playing the queue. */
        println("Stopped")
      case .Playing:
        /* The media player is playing the queue. Perhaps you
        can reduce some processing that your application
        that is using to give more processing power
        to the media player */
        println("Playing")
      case .Paused:
        /* The media playback is paused here. You might want
        to indicate by showing graphics to the user */
        println("Paused")
      case .Interrupted:
        /* An interruption stopped the playback of the media queue */
        println("Interrupted")
      case .SeekingForward:
        /* The user is seeking forward in the queue */
        println("Seeking Forward")
      case .SeekingBackward:
        /* The user is seeking backward in the queue */
        println("Seeking Backward")
      }
      
    }
  }
  
  func nowPlayingItemIsChanged(notification: NSNotification){
    
    println("Playing Item Is Changed")
    
    let key = "MPMusicPlayerControllerNowPlayingItemPersistentIDKey"
    
    let persistentID =
    notification.userInfo![key] as? NSNumber
    
    if let id = persistentID?.stringValue {
      /* Do something with Persistent ID */
      println("Persistent ID = \(id)")
    }
  }
  
  func volumeIsChanged(notification: NSNotification){
    println("Volume Is Changed")
    /* The userInfo dictionary of this notification is normally empty */
  }