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KVO bug?

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KVO bug?

Subject: KVO bug?
From: Matteo Manferdini <email@hidden>
Date: Sat, 3 Jun 2006 20:18:36 +0200

Hi everyone. I'm trying to get arrays for removed and added items in a KVO observed array. But, when I look into the change dictionary (using NSKeyValueChangeOldKey and NSKeyValueChangeNewKeys) i get a NSNull object instead of the arrays. I noticed in mmalc'c GraphicsBinding sample (on http:// homepage.mac.com/mmalc/CocoaExamples/controllers.html) the following comment:

/*
Should be able to use
NSArray *oldGraphics = [change objectForKey:NSKeyValueChangeOldKey];
 etc. but the dictionary doesn't contain old and new arrays...??
*/

So is this a bug in Cocoa KVO? Do I have to do it manually or there is a way to make it work? Thank you very much.

---
Matteo Manferdini
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