Detect changes on NSUserDefaults

Question

I\'m developing an iOS application with latest SDK.

I want to know when a property on NSUserDefaults changes it value.

I have found this, but it

Answer 1

Use NSUserDefaultsDidChangeNotification for notification about change in User defaults:

[[NSNotificationCenter defaultCenter] addObserver:self
    selector:@selector(defaultsDidChange:) name:NSUserDefaultsDidChangeNotification
    object:nil];

// notification
- (void)defaultsDidChange:(NSNotification *)aNotification
{
     //
}

Use KVO for notification about specific change in User defaults:

[[NSUserDefaults standardUserDefaults] addObserver:self 
    forKeyPath:@"APXMyPropertyIamInterestedInKey" options:NSKeyValueObservingOptionNew
    context:NULL];

// KVO handler
-(void)observeValueForKeyPath:(NSString *)aKeyPath ofObject:(id)anObject
    change:(NSDictionary *)aChange context:(void *)aContext 
{
    // 
}