hide and show left navigation bar button on demand in iOS-7

Question

I added my left navigation bar button using the storyboard. but I want it to hide when I first load the screen. And then in response to something else, I want it to show. The na

Answer 1

Here is what I did. On the initial screen I wanted to hide the navigation bar:

 self.navigationController.navigationBarHidden = YES;

On the second screen I wanted to show the navigation bar so I set:

 self.navigationController.navigationBarHidden = NO;