Re: Unobserved Changes
Re: Unobserved Changes
- Subject: Re: Unobserved Changes
- From: "Jason Barker" <email@hidden>
- Date: Fri, 22 Feb 2008 13:07:30 -0700
Keary,
You guessed it. I changed the observer to the arrangedObjects property of
the array controller and now I'm getting notified of changes.
Thanks!
Jason
On Fri, Feb 22, 2008 at 11:24 AM, Keary Suska <email@hidden> wrote:
> on 2/22/08 2:45 AM, email@hidden purportedly said:
>
> > [container addObserver: self forKeyPath: @"characteristics.myarray"
> options:
> > 0 context: NULL];
>
> AFAIK, you can't observe changes to the *contents* of an array using the
> above; you can only observe when the array object itself is replaced. If,
> however, you observe the arrangedObjects property of the array controller,
> you will get notified when objects are added or removed.
>
> > I have a NSArrayController object set up to manage changes by a user to
> the
> > NSMutableArray object through a table view. I also have a button that,
> when
> > clicked, adds a row to the table. Such a change to the array does not
> seem
> > to be sending a "changed" message to the observer (the
> ContainerController
> > object). I am pretty sure that I've followed the KVO criteria regarding
> this
> > array object. How should I set this up so that my ContainerController
> object
> > will be notified when an element is added to the array?
>
> You may have followed KVO, but did you follow KVC, and hence have indexed
> accessors? If so, then you can trap additional and deletions, and even
> replacements if you implemented the optional accessor.
>
> Best,
>
> Keary Suska
> Esoteritech, Inc.
> "Demystifying technology for your home or business"
>
>
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