CoreData addObserver NSKeyValueChangeInsertion

Question

Is there a way to get the object that has been added using addObserver:forKeyPath:options:context: with option NSKeyValueChangeInsertion on an NSManagedObject?

Answer 1

Yes. From the documentation for observeValueForKeyPath:ofObject:change:context::

change A dictionary that describes the changes that have been made to the value of the property at the key path keyPath relative to object. Entries are described in “Keys used by the change dictionary.”

And further down:

NSKeyValueChangeKindKey An NSNumber object that contains a value corresponding to one of the NSKeyValueChangeKindKey enumerations, indicating what sort of change has occurred.

NSKeyValueChangeIndexesKey If the value of the NSKeyValueChangeKindKey entry is NSKeyValueChangeInsertion, NSKeyValueChangeRemoval, or NSKeyValueChangeReplacement, the value of this key is an NSIndexSet object that contains the indexes of the inserted, removed, or replaced objects.