iPhone上取消控制播放音乐时如何设置标题？

我正在开发一个广播应用程序，它支持在后台播放音乐。但我陷入了如何设置音乐标题以取消控制的困境。

The difference between my app and "Music" is as following:

我应该怎么做才能让我的应用程序显示像“音乐”这样的音乐标题？

Thanks!

这是示例代码：

#import <MediaPlayer/MPNowPlayingInfoCenter.h>
#import <MediaPlayer/MPMediaItem.h>

MPMediaItemArtwork *albumArt;


- (void)changeTrackTitles
{
  Class playingInfoCenter = NSClassFromString(@"MPNowPlayingInfoCenter");

    if (playingInfoCenter) 
    {
        albumArt = [[MPMediaItemArtwork alloc] initWithImage: [UIImage imageNamed:@"HexagonArtwork"]];
        NSMutableDictionary *songInfo = [[NSMutableDictionary alloc] init];
        [songInfo setObject:@"SongName" forKey:MPMediaItemPropertyTitle];
        [songInfo setObject:@"AlbumName" forKey:MPMediaItemPropertyAlbumTitle];
        [songInfo setObject:@"ArtistName" forKey:MPMediaItemPropertyArtist];
        [songInfo setObject:albumArt forKey:MPMediaItemPropertyArtwork];
        [[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:songInfo];
    }
}