On Mar 19, 2009, at 12:03, m...@sky4studios.be wrote:
In this narrowed down code of the bug it will log this on
removeObserver
(please ignore the Terminating app due to uncaught exception
'NSInternalInconsistencyException', reason) because I just created
simple
main sample code to narrow it down:
*** Terminating app due to uncaught exception
'NSInternalInconsistencyException', reason: 'Cannot remove an observer
<Observer 0x10ac00> for the key path "targetPhoto.name" from
<NSMyArrayController 0x1099d0>, most likely because the value for
the key
"targetPhoto" has changed without an appropriate KVO notification
being
sent. Check the KVO-compliance of the NSMyArrayController class.'
This is not a lot of help to you, but I vaguely remember a discussion
on this list a couple of months ago about problems with KVO on
subclassed NSArrayControllers. I can't find the thread, but I did find
that someone has been here before you:
http://www.cocoabuilder.com/archive/message/cocoa/2008/4/15/204196
Why it should fail is not clear, but it may be that the code that adds
observers does something special with NSArrayControllers (but doesn't
realize your class is a subclass, or can't work properly if it's a
subclass).
Alternatively, it may be a side effect of the well-known defect in
NSArrayController where its KVO notifications don't contain the proper
new/old values.
If I understand your workaround correctly, it bypasses (what we assume
to be) NSArrayController's own overrides of didChange.../
willChange... . That may get your custom property observer
notifications to work properly, but my guess is that this will break
(some) behavior of any objects using the NSArrayController's usual
notifications.
A better workaround strategy might be to avoid subclassing
NSArrayController, and find another way to achieve what subclassing
was going to get for you.
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