How does a custom accessor method implementation in Core Data look like?
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Published on 2010-06-11T12:20:55Z
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The documentation is pretty confusing on this one:
The implementation of accessor methods you write for subclasses of NSManagedObject is typically different from those you write for other classes.
If you do not provide custom instance variables, you retrieve property values from and save values into the internal store using primitive accessor methods. You must ensure that you invoke the relevant access and change notification methods (willAccessValueForKey:, didAccessValueForKey:, willChangeValueForKey:, didChangeValueForKey:, willChangeValueForKey:withSetMutation:usingObjects:, and didChangeValueForKey:withSetMutation:usingObjects:). NSManagedObject disables automatic key-value observing (KVO, see Key-Value Observing Programming Guide) change notifications, and the primitive accessor methods do not invoke the access and change notification methods.
In accessor methods for properties that are not defined in the entity model, you can either enable automatic change notifications or invoke the appropriate change notification methods.
Are there any examples that show how these look like?
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