How to add MPMediaItem to MPMediaItemCollection

Question

I hope to play MPMediaItemcollection using MPMusicPlayerController.

musicPlayer = [MPMusicPlayerController applicationMusicPlayer];

I have got the handler of MPMediaItem *mediaItem.

How can I add MPMediaItem to MPMediaItemCollection? I try addObject, but no function.

Answer 1

You can't add items to an already created MPMediaItemCollection. Instead you have to add them when you create the collection, using initWithItems: or collectionWithItems:.

You could "fake" adding an item by creating a new collection based off of the old one. Something like this:

NSMutableArray *items = [NSMutableArray arrayWithArray:myMediaItemCollection.items];
[items addObject:myNewMediaItem];
MPMediaItemCollection *myNewMediaItemCollection = [MPMediaItemCollection collectionWithItems:items];

(If your collections are going to live beyond the scope of the current method, you'll need to assign them to properties or call retain as appropriate.)