It is well known in some circles that NSArrayController does not correctly
populate the KVO change dictionary.
If you manually observe an array controller’s arranged objects key path with
the old and new observation options, the change dictionary you will get when an
object is inserted will look like the following:
{
kind = 1;
new = "<null>";
old = "<null>";
}
http://ddeville.me/2013/10/nsarraycontroller-and-kvo-dependent-keys/
Thats fine, I get that. I do not want or need a populated change dicationary.
But what I do need is two notifications, one prior to the change and one after
the change.
If you manually observe an array controller's arranged objects key path with
the prior observation option, you still only get one notification, after the
change has been made. The documentation states the prior option should result
in a notification sent prior to the change and a notification sent after the
change.
Is there any way to receive a before and after notification for the
arrangedObjects property?
--Richard
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