后退按钮的调用方法

Question

I have a navigation controller that has a hidden navigation bar on the first view, and then appears for all children views. Problem is, I can't seem to hide it again if you go back to the first view.

I created a back button (so I could rename it) in the first view's init:

self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] 
  initWithTitle:@"Logout" style:nil target:self 
  action:@selector(hideNavigationBar:)];

But the method never gets called. Why?

Answer 1

在第一个控制器的-(void)viewWillAppear ，说：

  [self.navigationController setNavigationBarHidden:YES animated:NO];