Re: NSUserDefault controller bindings - observeValueForKeyPath called twice?
Re: NSUserDefault controller bindings - observeValueForKeyPath called twice?
- Subject: Re: NSUserDefault controller bindings - observeValueForKeyPath called twice?
- From: Alex Zavatone <email@hidden>
- Date: Fri, 18 Aug 2017 06:47:28 -0500
Check to see how many observers you have.
> On Aug 18, 2017, at 4:23 AM, Nick <email@hidden> wrote:
>
> Hello
> I am having a weird problem.
> I have a slider and a textfield with number formatter, both bound to a
> NSUserDefaultsController's "values" controller key and the "someVal"
> property.
>
> I am also registering for notifications in the -viewDidLoad of the view
> controller:
>
> [[NSUserDefaults standardUserDefaults] addObserver:self forKeyPath:
> @"someVal" options:0 context:nil];
>
>
> The problem is that observeValueForKeyPath is being called twice every time
> I move the slider or enter a new value in the edit.
>
>
> The viewDidLoad is executed only once (checked with an NSLog).
>
>
> It is easily reproducible.
>
> Why this might happen?
>
> macOS Sierra.
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