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KVO Setting a flag for any property change

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KVO Setting a flag for any property change

Subject: KVO Setting a flag for any property change
From: Andre Masse <email@hidden>
Date: Wed, 14 Dec 2011 08:29:54 -0500

Hi,

I have a superclass which has a "modified" BOOL property and a bunch of subclasses based on it. When any property is changed, I need to set this flag to YES. I can either write a setter for all properties and set this flag there, or observe all properties and set the flag in -observeValueForKeyPath. Both approach involve a lot of boilerplate coding (some subclasses have 20+ properties).

I thought about using -keyPathsForValuesAffectingModified: but I don't see how I can set a flag using this.

Any ideas?

Thanks,

Andre Masse
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