How to filter MPMediaQuery using comparison predicates?

Question

I'd like to fetch all songs in a user's iPod library that are over 30 seconds long. I know I need to add a predicate to the query, but I'm not sure how to do so exactly when it's something more advanced than artist = blah.

NSPredicate *predicate = [MPMediaQuery songsQuery];
MPMediaPredicate *fPredicate = ???;
[query addFilterPredicate:fPredicate];

I also looked at:

[MPMediaPropertyPredicate predicateWithValue:<#(id)#> forProperty:<#(NSString *)#> comparisonType:<#(MPMediaPredicateComparison)#>]

But it seems MPMediaPredicateComparison just has "contains" and "equal to", not "greater than"/"less than"/etc.

Answer 1

The MPMediaPropertyPredicate only supports comparison types EqualTo and Contains as you mentioned. You will need to fetch all songs and loop over them.