NSUserDefaults and KVO issues

Question

I\'m using NSUserDefaults in my app and I would like to be notified when a particular value is changed. For that, I added the following lines in viewDidLoad:

Answer 1

NSUserDefaults is not KVO compliant, but NSUserDefaultsController is. So you'd use:

NSUserDefaultsController *defaultsc = [NSUserDefaultsController sharedUserDefaultsController];
[defaultsc addObserver:self forKeyPath:@"values.pref_server" 
               options:NSKeyValueObservingOptionNew 
               context:NULL];