MPMusicPlayerController systemMusicPlayer播放skipToNextItem速度慢，滞后

我使用MPMusicPlayerController systemMusicPlayer播放音乐，但跳过歌曲后，我注意到显着的滞后。

这是我测量的“滞后”，有时更快：

• 1.280796
• 1.210124
• 1.019931
• 1.167739

在跳过几首歌之后，听到声音之前的延迟时间增加了很多。

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-(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]; } 

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 -(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

这似乎为我工作：

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