All MPMediaItem
s and some other MediaPlayer.framework
classes have a unique identifier called a persistent ID. It is a uint64_t
wrapped in an NSNumber
. Here are the persistent IDs you can retrieve from an MPMediaItem
using valueForProperty:
NSString *const MPMediaItemPropertyPersistentID; // filterable
NSString *const MPMediaItemPropertyAlbumPersistentID; // filterable
NSString *const MPMediaItemPropertyArtistPersistentID; // filterable
NSString *const MPMediaItemPropertyAlbumArtistPersistentID; // filterable
NSString *const MPMediaItemPropertyGenrePersistentID; // filterable
NSString *const MPMediaItemPropertyComposerPersistentID; // filterable
NSString *const MPMediaItemPropertyPodcastPersistentID; // filterable