NSScreencast Episode #16 Key Value Observing

Key Value Observing - NSScreencast

• KVO - key value observing
• backgroundColor -> labelColor
  • viewDidLoad
    • [self.view addObserver:self forKeyPath options
  • observeValueForKeyPath
    • if keyPath isEqualToString
  • viewDidUnload
    • removeObserver
• static char * kBackgoundColorObservationContext
  • static void *... = &kBackground...
• custom setters (setName)
  • willChangeValueForKey
  • didChangeValueForKey