Re: KVO Question: How to programmatically determine if one object is observing another on a keyPath and context?
Re: KVO Question: How to programmatically determine if one object is observing another on a keyPath and context?
- Subject: Re: KVO Question: How to programmatically determine if one object is observing another on a keyPath and context?
- From: Quincey Morris <email@hidden>
- Date: Sun, 09 Sep 2012 16:26:27 -0700
On Sep 9, 2012, at 13:50 , Motti Shneor <email@hidden> wrote:
> On 9 בספט 2012, at 22:04, Ken Thomases wrote:
>
>> Why is that a "however"? What's the problem? Since the representedObject is KVO-compliant, all observations _through_ that property will automatically follow it as it changes.
>
> Nope. When representedObject becomes nil, I DO NOT WANT to observe anything, and I need to remove the observance from the previous representedObject, BEFORE it is set to nil on my NSViewController.
I think, by using the word "through", Ken is suggesting you do this:
[self addObserver:self forKeyPath:@"representedObject.incomingNotes" ...];
rather than this:
[self.representedObject addObserver:self forKeyPath:@"incomingNotes" ...];
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