Key Value Observer Center

MLAKeyValueObserverCenter allows you to use K.V.O as you will do with NSNotificationCenter.

Its purpose is to make K.V.O notification more flexible :

• Selectors and blocks as callback
• Safe remove observer
• Allow retrieve observers for a given object’s keyPath

How to use it ?

[[MLAKeyValueObserverCenter defaultCenter] addObserver:self 
                                              selector:@selector(nameDidChange:) 
                                               keyPath:@"name" 
                                                object:self.person];

- (void)nameDidChange:(NSDictionary *)change
{
   // implementation go here
}

[[MLAKeyValueObserverCenter defaultCenter] removeObserver:self];

Using block

id observer = [[MLAKeyValueObserverCenter defaultCenter] addObserverForKeyPath:@"name" 
                                                                        object:self.person 
                                                                    usingBlock:^(NSDictionary *changes) {
        NSLog(@"Name has changed !");
    }];