创建一个 MPMediaPickerController 以便您可以从 iPod 中选择一些音乐，然后在 mediaPicker:didPickMediaItems: 回调中你这样做:

Create a MPMediaPickerController so you can choose some music from the iPod, then in the mediaPicker:didPickMediaItems: call back you do this:

MPMusicPlayerController* playa;
playa = [MPMusicPlayerController applicationMusicPlayer];
[playa setQueueWithItemCollection:mediaItemCollection];
[playa play];