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Key Value Observer

/ Published in: Objective C
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Communication between objects..

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  1. - (void)applicationDidFinishLaunching:(UIApplication *)application {    
  2.  
  3.     // Override point for customization after app launch    
  4.     [window addSubview:viewController.view];
  5. [viewController addObserver:self forKeyPath:@"iVar" options:(NSKeyValueObservingOptionNew) context:NULL]; 
  6.     [window makeKeyAndVisible];
  7. }
  8.  
  9. - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object 
  10. 						change:(NSDictionary *)change context:(void *)context { 
  11.     NSLog(@"Value %@ changed in %@", keyPath, [object description]); 
  12. }

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