I have a thought. Do you have a binding somewhere on a property in NSUserDefaults? Maybe your document is getting synchronized to iCloud and/or getting autosaved very often? These are things I’ve seen that can cause uncharacteristically often updates. -- Gary L. Wade http://www.garywade.com/ <http://www.garywade.com/> > On Oct 18, 2016, at 7:32 PM, Gerriet M. Denkmann <g...@mdenkmann.de> wrote: > > >> On 19 Oct 2016, at 02:00,Jerome Krinock <je...@ieee.org>: >> >>> On 2016 Oct 14, at 23:08, Gerriet M. Denkmann <g...@mdenkmann.de> 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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