導航控制器後退按鈕

Question

如何以編程方式創建導航控制器的後退按鈕？

Answer 1

在-(void)loadView或類似：

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. 
}