ANIMATION BLOCK

gistfile1.txt

    [UIView animateWithDuration:HIDE_CONTROLS_ANIMATION
                     animations:^{
                         // and other controls
                         
                         self.navigationController.navigationBar.hidden = ControlsHidden;
                         self.tabbar.hidden = ControlsHidden;
                         
                     }
                     completion:^(BOOL finished){

                     }];