UINavigationController后退和关闭按钮

Question

大家好我有一个导航控制器， 控制器工作正常，并显示返回窗口的后退按钮 但是当我添加这个代码来添加关闭按钮时：

- (void)viewDidLoad 
{
  [super viewDidLoad];

  UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:@"Chiudi" 
                                  style:UIBarButtonItemStylePlain target:self
                       action:@selector(dismissModalViewControllerAnimated:)];          

  self.navigationItem.rightBarButtonItem = doneButton;

  [doneButton release];

}

后退按钮消失，我只能看到关闭按钮 为什么？

Answer 1

问题在于

 dismissModalViewControllerAnimated 

我必须使用

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