How to access the previous UIViewController from a pushed UIViewController your about to close

MyViewController_excerpt.m

- (void)closeThisViewController {
  
  // Lets retain an instance of the current navigation controller
  UINavigationController *navController = [self.navigationController retain];
  
  // When this is called self.navigationController is no longer available
  [self.navigationController popViewControllerAnimated: YES];
  
  // To talk to that previous VC here's what you do
  [[navController topViewController] doSomethingHere:YES];
  
  // We retained it, lets release it!
  [navController release];

}