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UINavigationControoller - setNavigationBarHidden:animated: How to sync other animations
[self.navigationController setNavigationBarHidden:YES animated:YES];
 [UIView transitionWithView:self.view
                   duration:UINavigationControllerHideShowBarDuration
                    options:UIViewAnimationOptionCurveLinear
                 animations:^
  {
   /* Put other animation code here ;) */
  }
                 completion:^(BOOL finished)
  {
  }];