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Re: observeValueForKeyPath:... called too often in macOS 12
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Re: observeValueForKeyPath:... called too often in macOS 12


  • Subject: Re: observeValueForKeyPath:... called too often in macOS 12
  • From: "Gerriet M. Denkmann" <email@hidden>
  • Date: Wed, 19 Oct 2016 09:32:27 +0700

> On 19 Oct 2016, at 02:00,Jerome Krinock <email@hidden>:
>
>> On 2016 Oct 14, at 23:08, Gerriet M. Denkmann <email@hidden> wrote:
>>
>> My app (macOS 12) observes a value in NSUserDefaults.  Starting with macOS 12 observeValueForKeyPath:… is called at the start of the program, although nothing has changed yet.  When the value actually changes, it is called twice.
>
> I just added some code to one of my apps, to test this.  It confirmed your observations, although I only tested in 10.12.
>
>> Also: NSKeyValueObservingOptionNew or NSKeyValueObservingOptionOld just return NSNull instead of old or new values.
>
> That only happens during that first spurious call, when the observer is added.

Happens for me all the time. Never seen anything other than NSNull.

Current work-around: just ignore every second notification (i.e. ginore 1., 3rd, 5th etc.).
Not a very good solution, rather bound to break sooner or later. But okay for the time being.

>
>>  If indeed this behavior is new in 10.12, it certainly warrants a Bug Report.

Ok, will do so.

Kind regards,

Gerriet.


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