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Re: -observeValueForKeyPath:ofObject:change:context: only, > defined for abstract class.

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Re: -observeValueForKeyPath:ofObject:change:context: only, > defined for abstract class.

Subject: Re: -observeValueForKeyPath:ofObject:change:context: only, > defined for abstract class.
From: Scott Anguish <email@hidden>
Date: Sun, 8 Jan 2006 17:50:52 -0500


On Jan 8, 2006, at 11:43 AM, Todd Ransom wrote:

There is a good example of how to implement undo using KVO in Aaron Hillegass' book:
http://www.bignerdranch.com/products/cocoa1.shtml
I think it is based on NSDocument but it should be easy to adapt. Maybe one of the Apple folks can explain why the example calls super. It sounds like a documentation bug.

it calls super because the superclass may want to have a chance at acting upon the same change notification.

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References:  
  >Re: -observeValueForKeyPath:ofObject:change:context: only,>      defined	for abstract class. (From: David Burnett <email@hidden>)
  >Re: -observeValueForKeyPath:ofObject:change:context: only,	> defined for abstract class. (From: Todd Ransom <email@hidden>)




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