ios - IOS::如何检测MPMediaSongs中下载的歌曲

Question

我需要实现这个功能。帮助我。我不想在我的应用程序中显示下载的歌曲。我得到了一些歌曲名称，比如“url格式”。如何检测那个。谢谢。

playlistsQuery = [MPMediaQuery playlistsQuery];
    playlists = [playlistsQuery collections];
    NSArray *playlistsss = [myPlaylistsQuery collections];
    for (MPMediaPlaylist *playlist in playlistsss) {
        NSLog (@"%@", [playlist valueForProperty: MPMediaPlaylistPropertyName]);
        NSArray *songs = [playlist items];

        for (MPMediaItem *song in songs) {

            NSString *songTitle =[song valueForProperty: MPMediaItemPropertyTitle];
            NSString *str_artistName =[song valueForProperty: MPMediaItemPropertyArtist];
            NSLog(@"teh artist name is --->%@",str_artistName);
            playlists=[song valueForProperty: MPMediaItemPropertyTitle];
            NSLog(@"the songs titles---->%@",array_playList);

        }
    }