NSPredicate - filtering values based on a BOOLEAN stored value

Question

I have a core data model object called Entry. In this I have an attribute IsFavorite.

I would like to use an NSPredicate to filter the results of my NSFetchedResultsCont

Answer 1

on iOS 10, xcode 9.0, looking for a core data managedObject with Boolean NO attribute:

[NSPredicate predicateWithFormat:@"attributeName == nil"]