Re: KVO for NSArrayController subclass

FROM : Scott Stevenson
DATE : Tue Nov 30 21:47:47 2004

On Nov 29, 2004, at 6:16 PM, Alex v.Below wrote:

> The question I am about to ask seems to have been asked in the past,
> but I can not find an answer. I am registering as an observer to my
> custom NSArrayController by:
>
>             [_listController addObserver:self
>                       forKeyPath:@"arrangedObjects"
>                          options: (NSKeyValueObservingOptionNew |
>                                   NSKeyValueObservingOptionOld)
>                          context:NULL];
>
> Now, observeValueForKeyPath is called, but the change dictionary
> contains nil for both old and new. Also, passing the change up to
> super crashes the app.


Can you give a broader description of what you're trying to do? In most
cases, it makes more sense to observe the source array for changes.


    - Scott


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