NSUserDefaultsDidChangeNotification with NSUserDefaultsController
NSUserDefaultsDidChangeNotification with NSUserDefaultsController
- Subject: NSUserDefaultsDidChangeNotification with NSUserDefaultsController
- From: "Sean McBride" <email@hidden>
- Date: Tue, 3 Aug 2004 01:00:32 -0400
Hi,
I'm trying to understand exactly when NSUserDefaultsDidChangeNotification
is posted. Or, more generally, when using NSUserDefaultsController, when
and how can I act on the changed preferences?
mmalc's "ControlledPreferences" example has been very useful, but I
notice what I consider a strange behaviour:
- if I change the textfield, NSUserDefaultsDidChangeNotification is
posted once
- the 1st time I click the colourwell (without changing colours), its
posted 4 times
- subsequent times, its not posted at all unless i change colours
- same thing with the 'fonts' button
- clicking the 'factory' button also gets me 4 postings
4 is the number of keys this app has in its defaults database.
In my app, the same happens. But in response to the changed prefs, I
need to do a lengthy operation, and so doing it 4 times is bad. :)
I may turn off the 'appliesImmediately' flag, but I'd still like to
understand when things are posted. Apple's docs say only "This
notification is posted the first time after a synchronize when a change
is made to defaults in a persistent domain" which doesn't mean much to me.
Thanks!
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