UINavigation控制器后退和关闭按钮

Question

>我有一个导航控制器。控制器运行良好，并向我显示返回窗口的后退按钮。但是当我添加此代码以添加关闭按钮时：

- (void)viewDidLoad 
{
  [super viewDidLoad];
  UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:@"Chiudi" 
                                  style:UIBarButtonItemStylePlain target:self
                       action:@selector(dismissModalViewControllerAnimated:)];          
  
  self.navigationItem.rightBarButtonItem = doneButton;
  
  [doneButton release];
}

。然后后退按钮消失，我只能看到关闭按钮。为什么？

Answer 1

问题出在

 dismissModalViewControllerAnimated 

我不得不使用

 [self.navigationController dismissModalViewControllerAnimated:YES];     
 [self.navigationController popToRootViewControllerAnimated:NO];