Hello, I'm puzzled by a problem that I am seeing with key value observing an arraycontroller and I'm hoping that someone here could shed some light. Here's the situation:
I have a nib with a panel that contains a collectionview and an arraycontroller. It's like some Tool panel in a drawing app. The arraycontroller content binding is bound to a method in the windowcontroller (file's owner) that returns an array of custom objects. The collectionview content and selectionIndexes bindings are bound to the arraycontroller. This all seems to play nicely together. Next, the windowcontroller's document is observing the 'selection' property of the arraycontroller. The purpose is to get hold of whatever object is selected in the collectionview and link that to a 'tool' property of the document. Now, when I change the selection in the collectionview, the document is indeed notified, but what's puzzling me is that the value for the 'new' key in the change dictionary is 'null'. I've tried observing other arraycontroller properties, such as 'selectionIndexes' or 'selectedObjects', and the document gets all the notifications, but 'new' as well as 'old' value in the change dictionary are always 'null', even though I can get a hold of the selected object using '[object selectedObjects]'. So why is this object not in the change dictionary? Thanks for any help. -- Luc Van Bogaert
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