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

I don't think a behavior when you are hiding and showing the navigation bar dynamically as you are pushing controllers is supported.

Simple solution - hide the animation bar of the UINavigationController and if you want to show it on some controller, just add a UINavigationBar to it.