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Re: objectInXXXAtIndex: exception

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Re: objectInXXXAtIndex: exception

Subject: Re: objectInXXXAtIndex: exception
From: mmalcolm crawford <email@hidden>
Date: Mon, 9 May 2005 18:00:28 -0700


On May 9, 2005, at 3:45 PM, Bertrand Landry-Hetu wrote:

What happens is that the application starts up, the GUI connects to
the model, everything works. Something triggers an update of our model
and ends up calling removeAllObjects on the NSMutableArray that
represents Bar. So to keep the bindings updated we wrapped that call
in willChangeValueForKey:@"bar", didChangeValueForKey:@"bar", so it
does trigger the NSArrayControllers that is bound to Foo.Bar.

Umm, this is wrong. You're telling observers that something has happened that hasn't...

See:
    <http://homepage.mac.com/mmalc/CocoaExamples/controllers.html>
    "Batch import into an array, and other mass changes"

You want to do the inverse of adding (so you'll use NSKeyValueChangeRemoval etc.)...

mmalc


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  >objectInXXXAtIndex: exception (From: Bertrand Landry-Hetu <email@hidden>)




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