Using KVO to observe changes to a property on an object inside a collection in Objective-C

Question

I have a Core Data object (AGroup) with a to-many relationship to a collection of other Core Data objects (items, which are instances of ANItem). I\'m using the AGroup obje

Answer 1

Im pretty sure there's no way to directly observe the contents of a collection like that. I think the best bet is to define the KVC/KVO compliant set accessors/mutators, observe self.items, and use the change notifications to directly observe sortProperty on each of the objects as they are added to the collection.

Since this is Core Data, you may also/instead need to use the context save notifications to detect changes in items. I don't have enough experience with Core Data to say for sure though.