Re: observeValueForKeyPath:... called too often in macOS 12
Re: observeValueForKeyPath:... called too often in macOS 12
- Subject: Re: observeValueForKeyPath:... called too often in macOS 12
- From: Jerome Krinock <email@hidden>
- Date: Tue, 18 Oct 2016 19:59:03 -0700
> On 2016 Oct 18, at 19:32, Gerriet M. Denkmann <email@hidden> wrote:
>
>
>> On 19 Oct 2016, at 02:00,Jerome Krinock <email@hidden>:
>>
>>> On 2016 Oct 14, at 23:08, Gerriet M. Denkmann <email@hidden> wrote:
>>
>>> 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.
Well, then there is something weird in your app, or in mine. I would bet on yours, because if such change notifications were broken in 10.12, thousands of apps would not work. Create a small demo project and try to reproduce.
> 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.
“Not a very good solution”, indeed. If I understand you correctly, if you ran your app in 10.11 with this “solution”, it wouldn’t work. The workaround that I suggested (filtering for substantive changes), you know, at least it has a logical basis, and if Apple changes this undocument behavior back to the old undocumented behavior, it should still work.
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