Re: Calling -addObserver:forKeyPath:… more than once
Re: Calling -addObserver:forKeyPath:… more than once
- Subject: Re: Calling -addObserver:forKeyPath:… more than once
- From: Rick Mann <email@hidden>
- Date: Fri, 26 Aug 2011 12:44:12 -0700
Thanks for verifying.
On Aug 26, 2011, at 7:09 , Heath Borders wrote:
> You must call remove as many times as you call add. Otherwise,
> subclasses and superclasses would interfere with each other's
> observations.
>
> -Heath Borders
> email@hidden
> Twitter: heathborders
> http://heath-tech.blogspot.com
>
>
>
> On Fri, Aug 26, 2011 at 4:34 AM, Rick Mann <email@hidden> wrote:
>> Is -addObserver:forKeyPath:… idempotent? I called it multiple times with the same parameters, but called -removeObserver:forKeyPath: only once, and the object continued to receive KVO notifications.
>>
>> After adding code to ensure -addObserver:forKeyPath:… was only called once, -removeObserver:forKeyPath: seemed to work as expected.
>>
>> I couldn't find any clear indication in the docs or searching online, although I did find some things that indicate these APIs rather do suck.
>>
>> --
>> Rick
>>
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