MPMusicPlayerController systemMusicPlayer play skipToNextItemが遅く遅い

Question

私はMPMusicPlayerController systemMusicPlayerを使って の音楽を再生していますが、曲をスキップした後には大きな遅れがあります。ここで

は、時にはそれが高速です、私が測定している私の "遅れ" である。いくつかの曲を飛ばした後

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• 1.210124
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• 1.167739

あなたが音を聞く前に遅れはかなり増加する 。

---

-(void)viewDidLoad { 
    [[MPMusicPlayerController systemMusicPlayer] setQueueWithQuery:[MPMediaQuery songsQuery]]; 
    [[MPMusicPlayerController systemMusicPlayer] prepareToPlay]; 

    NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter]; 

    [notificationCenter addObserver:self selector:@selector(handlePlaybackStateChanged:) 
           name:MPMusicPlayerControllerPlaybackStateDidChangeNotification object:nil]; 


    [notificationCenter addObserver:self 
          selector:@selector(handleNowPlayingItemChanged:) 
           name:MPMusicPlayerControllerNowPlayingItemDidChangeNotification 
          object:[MPMusicPlayerController systemMusicPlayer]]; 

    [[MPMusicPlayerController systemMusicPlayer] beginGeneratingPlaybackNotifications]; 

} 

---

-(IBAction)playBtn:(id)sender {     
    if ([MPMusicPlayerController systemMusicPlayer].playbackState !=  MPMusicPlaybackStatePlaying) { 
      [[MPMusicPlayerController systemMusicPlayer] play]; 
     } else { 
      [[MPMusicPlayerController systemMusicPlayer] pause]; 
     } 
} 

-(void)skipTrack { 

    startTrackChange = [NSDate date];    
    [[MPMusicPlayerController systemMusicPlayer] skipToNextItem]; 
} 


-(void)handleNowPlayingItemChanged:(id)notification { 

    NSLog(@"%f",[startTrackChange timeIntervalSinceNow]); 
} 

Answer 1

これは私のために働くようだ：

MPMediaQuery *mediaQuery = [MPMediaQuery songsQuery]; 

    // filter out cloud items, cloud items cause delays 
    [mediaQuery addFilterPredicate:[MPMediaPropertyPredicate 
           predicateWithValue:@NO 
             forProperty:MPMediaItemPropertyIsCloudItem]];