How to hide navigation bar in iPhone?

Question

Currently i am working in iPhone app, I have two screen like A and B, A has no navigation bar, but B has navigation bar. so i set like this.

Class A:

Answer 1

Try setting the navigationBarHidden: in viewWillDisAppear of class B

in class B

-(void)viewWillDisAppear:(BOOL)animated
{
    [self.navigationController setNavigationBarHidden:YES];
}