ios - 播放音乐中的所有歌曲

Question

我有这段代码可以播放音乐库中的所有歌曲（通过 iTunes 添加并从 Apple Music 下载到库中）。我不能只有歌曲。我究竟做错了什么？

-(IBAction)playAllSongs:(id)sender {

  MPMediaQuery *songsQuery = [MPMediaQuery songsQuery];
  NSArray *songsArray = [songsQuery collections];

  MPMediaItemCollection *items =  [MPMediaItemCollection collectionWithItems:songsArray];
  MPMusicPlayerController *musicPlayer = [MPMusicPlayerController systemMusicPlayer];
  [musicPlayer setQueueWithItemCollection:items]; 
}

Answer 1

上面的答案有效，但这是一种迂回的方式。更简单的方法：

MPMediaQuery *songs = [MPMediaQuery songsQuery];
MPMusicPlayerController *musicPlayer = [MPMusicPlayerController systemMusicPlayer];
[musicPlayer setQueueWithQuery:songs]

Answer 2

我解决了自己

MPMediaQuery *songsQuery = [MPMediaQuery songsQuery];
NSArray *songsArray = [songsQuery items];

MPMediaItemCollection *items =  [MPMediaItemCollection collectionWithItems:songsArray];
MPMusicPlayerController *musicPlayer = [MPMusicPlayerController systemMusicPlayer];

//[songsQuery addFilterPredicate:[MPMediaPropertyPredicate predicateWithValue:[NSNumber numberWithBool:NO] forProperty:MPMediaItemPropertyIsCloudItem]]; // for iTunes Match or Apple music to exclude or not songs not in the device

[musicPlayer setQueueWithItemCollection:items];