Navigation Controller back button

Question

如何以编程方式创建导航控制器的后退按钮？

Answer 1

In -(void)loadView or similar:

UIBarButtonItem *btn = [[UIBarButtonItem alloc] initWithTitle:@"back" style:UIBarButtonItemStyleBordered target:self action:@selector(backPressed:)];
self.navigationItem.leftBarButtonItem = btn;
[btn release];

-(void)backPressed: (id)sender
{
    [self.navigationController popViewControllerAnimated: YES]; // or popToRoot... if required.
}