MPMediaItemCollection to NSUserDefaults save

[Pavel Volobuev]

Hello everyone,

I need to save my MediaCollection when my app is shutting down.

I found in the Internet this couple of code

PHP Code:

//it's how to know persistentId of the song after you got mediaItemCollection from your mediaPickerViewController
//then you can sav it in userDefaults.
- (NSNumber *)getPersistentId :(MPMediaItemCollection *)collection atIndex:(int)index {
 MPMediaItem *mediaItem = [collection.items objectAtIndex:index];
 NSNumber *anId = [mediaItem valueForProperty:MPMediaItemPropertyPersistentID];
 return anId;
}

//when your application will be launched next time you can get required song:
- (void)obtainSongWitId:(NSNumber *)persistentId {
 MPMediaQuery *query = [MPMediaQuery songsQuery];
 MPMediaPropertyPredicate *predicate = [MPMediaPropertyPredicate predicateWithValue:persistentId forProperty:MPMediaItemPropertyPersistentID];
 [query addFilterPredicate:predicate];
 NSArray *mediaItems = [query items];
 //this array will consist of song with given persistentId. add it to collection and play it
 MPMediaItemCollection *col = [[MPMediaItemCollection alloc] initWithItems:mediaItems];
 ///....
 [col release];
} 


BUT with this method i can save just one song from my Collection, I need to save all collection, meybe all 500 songs or more

Could you help?

[Pavel Volobuev]

Nobody knows how can i save my MediaCollection? (MPMediaItemCollection) Really? Please, strain your brain!

[alyanm]

Originally Posted by Pavel Volobuev

Nobody knows how can i save my MediaCollection? (MPMediaItemCollection) Really? Please, strain your brain!

Did you figure this out? Seems like you could just save as an array of persistent IDs and then reconstruct your media library from those ids.