ios - Stop navigation bar from reappearing after rotate -

i have app user can tap screen , navigation bar fade out (i setting alpha 0), when device rotated navigation bar reappears (i guess alpha reset 1?). how can prevent behaviour?

the navigation bar stays hidden if use [self.navigationcontroller setnavigationbarhidden:yes animated:yes] instead, doesn't give me fade effect want.

is there way fading effect?

thanks

i assume you're animating out navigation bar alpha? why not hide navigation bar once you're finished?

    [uiview animatewithduration:1.0                  animations:^{                      self.navigationcontroller.navigationbar.alpha = 0;                  } completion:^(bool finished) {                      [self.navigationcontroller setnavigationbarhidden:yes animated:no];                  }];