MPMediaQuery *query = [MPMediaQuery playlistsQuery]; 
NSArray *playlists = [query collections];
for(int i = 0; i < [playlists count]; i++) {
NSLog(@"%@", [[playlists objectAtIndex:i] valueForProperty: MPMediaPlaylistPropertyName]);
}

First you need to create an MPMediaQuery using the playListsQuery.
Then, you loop through each playlist and retrieve the valueForProperty.

Retrieve all Playlists iOS SDK

ios

iPhone