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Re: KVO Question: How to programmatically determine if one object is observing another on a keyPath and context?
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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: Lee Ann Rucker <email@hidden>
  • Date: Sun, 09 Sep 2012 20:12:36 -0700 (PDT)

Yes, that approach is *so* much safer. When we switched over to doing it that way so many "dealloc called while object was being observed" problems went away.

----- Original Message -----
From: "Quincey Morris" <email@hidden>
To: "Motti Shneor" <email@hidden>
Cc: "Cocoa-Dev List" <email@hidden>
Sent: Sunday, September 9, 2012 4:26:27 PM
Subject: Re: KVO Question: How to programmatically determine if one object is	observing another on a keyPath and context?

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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 >Re: KVO Question: How to programmatically determine if one object is observing another on a keyPath and context? (From: Quincey Morris <email@hidden>)

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