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NSUserDefaults question
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NSUserDefaults question


  • Subject: NSUserDefaults question
  • From: Angela Brett <email@hidden>
  • Date: Tue, 5 Mar 2002 23:31:42 +1300

Hi,

I have several applications which share many of their settings. I know that with NSUserDefaults I can use addSuiteNamed:, persistentDomainForName: and setPersistentDomain:forName: in order to read and write defaults in a shared defaults file.

As I understand it, if I addSuiteNamed:@"My Main Defaults thingy" then when I use objectForKey: or one of those methods, it should return the object for that key in the @"My Main Defaults thingy" domain, or if there isn't one, the object for that key in the app-specific defaults. However, it seems the only way to write a default to @"My Main Defaults thingy" (using NSUserDefaults, anyway) is to do something like:

NSMutableDictionary *mainDefaults=[[[NSUserDefaults standardUserDefaults] persistentDomainForName: @"My Main Defaults thingy"] mutableCopy];
[mainDefaults setObject:myObject forKey:myKey];
[[NSUserDefaults standardUserDefaults] setPersistentDomain:mainDefaults forName: @"My Main Defaults thingy"];
[mainDefaults release];

which is quite a bit more complicated than just using [[NSUserDefaults standardUserDefaults] setObject:myObject forKey:myKey] which I would do to save a default to the specific defaults for that app.

I know that I could do it in one line with CFPreferencesSetAppValue((CFStringRef)myKey,myObject,CFSTR("My Main Defaults thingy"));

So, if there is a simple one-line way of changing a single default for the app name of my choice in CoreFoundation, how come there isn't a method like that in NSUserDefaults? Or is there one, and I just haven't see it?
--
Angela Brett email@hidden http://acronyms.co.nz/angela
A mathematician is a machine for turning coffee into theorems -- Paul Erdos
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