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Re: Strange observer problem
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Re: Strange observer problem


  • Subject: Re: Strange observer problem
  • From: Ken Thomases <email@hidden>
  • Date: Sat, 01 Dec 2012 14:01:04 -0600

On Dec 1, 2012, at 12:48 PM, Gordon Apple wrote:

> On 12/1/12 10:29 AM, "Kyle Sluder" <email@hidden> wrote:
>
>> Sounds like NSButton is not KVO-compliant for `state`.
>
> Well, its bindings certainly work, and the observers works when its state is
> changed by the distant (also bound) button.

Nothing about NSButton's bindings workings imply that its "state" property is KVO-compliant.

If something calls -setState: on the button (including KVC, while carrying out -setValue:forKey:), then that will generate KVO change notifications.  That's because -setState: conforms to the accessor naming conventions, so KVO can hook it.  However, when the button changes its own state in response to mouse events, it may not go through -setState: or otherwise be KVO-compliant.  It could just set an instance variable.  That's invisible to KVO.

Regards,
Ken


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