> On Apr 3, 2021, at 12:00, Gabriel Zachmann via Cocoa-dev 
> <cocoa-dev@lists.apple.com> wrote:
> 
> Oh, and BTW: what happens if I do this:
> 
>    NSDictionary * monitor_user_defaults = [ [NSUserDefaults standardDefaults] 
> dictionaryForKey: displayName_];
>    [monitor_user_defaults setObject: anArray forKey: @"Pref1"];
> 
> Will that make NSUserDefaults automagically write the new 
> preferences/defaults to disk?
> Will it notice that one of the dictionaries has changed?

No, get the dict, mutate it, and set it back into prefs. That’s why I suggested 
writing extensions on NSUserDefaults, which would do all this for you.

Steve via iPad

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