On Nov 2, 2011, at 1:47 PM, Travis Griggs wrote:
> I'm trying to create a language binding into the Cocoa environment. And my
> current problem is how to be able to determine when NSUserDefaults values
> have changed.
> [...] I just want to know when a user changes a value found in the
> NSGlobalDomain. In particular at the moment, the result I read with the
> command line expression
>
> defaults read NSGlobalDomain AppleShowScrollBars
You can't. There's no general means to know when other processes change
defaults, especially in domains other than your app's.
However, there's a very good chance that System Preferences sends out a
distributed notification when it changes that setting. The exact name of that
notification is an implementation detail which could change at any time and
relying on it in a shipping application is inviting trouble. I don't know for
sure that there is such a notification nor what its name might, but you can
write a program which monitors _all_ distributed notifications and find out for
yourself. Just watch what happens when you toggle that System Preferences
setting.
NSDistributedNotificationCenter* center =
[NSDistributedNotificationCenter defaultCenter];
[center addObserver:self selector:@selector(observeDistributed:)
name:nil object:nil];
- (void)observeDistributed:(NSNotification*)notification
{
NSLog(@"NSDistributedNotificationCenter: %@\n%@", [notification name],
notification);
}
Regards,
Ken
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