锁屏显示正在播放的音乐

 Class playingInfoCenter = NSClassFromString(@"MPNowPlayingInfoCenter");    if (playingInfoCenter) {        NSMutableDictionary *songInfo = [ [NSMutableDictionary alloc] init];        MPMediaItemArtwork *albumArt = [ [MPMediaItemArtwork alloc] initWithImage: [UIImage imagedNamed:@"AlbumArt"] ];        [ songInfo setObject: @"Audio Title" forKey:MPMediaItemPropertyTitle ];        [ songInfo setObject: @"Audio Author" forKey:MPMediaItemPropertyArtist ];        [ songInfo setObject: @"Audio Album" forKey:MPMediaItemPropertyAlbumTitle ];        [ songInfo setObject: albumArt forKey:MPMediaItemPropertyArtwork ];        [ [MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:songInfo ];    }