添加的UIBarButtonItem来的UINavigationController在iPhone SDK的

Question

我要添加后退按钮上的UINavigationController，我想下面的代码：

EGOPhotoViewController *photoController = [[EGOPhotoViewController alloc] initWithPhotoSource:source]; 
    UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:photoController]; 
    navController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve; 
    navController.modalPresentationStyle = UIModalPresentationFullScreen; 
    // UINavigationBar *my_bar; 
    //UINavigationItem *my_item=[[UINavigationItem alloc] initWithTitle:@"test"]; 
    UIBarButtonItem* button = [[UIBarButtonItem alloc] initWithTitle: @"Back" 
                   style: UIBarButtonItemStyleBordered 
                   target: navController 
                   action: @selector(onBack)]; 
    //my_item.rightBarButtonItem = button; 
    [[navController navigationItem] setRightBarButtonItem:button]; 
    self.title=@"Gallery"; 
    [self presentModalViewController:navController animated:YES]; 

该代码输出如下：

代码不在UINavigationController中添加后退按钮。我在UINavigationController中添加了代码到后退按钮，我的代码有什么错误...！

请任何人帮助我......！

谢谢..！

Answer 1

尝试从rootviewcontroller类（photoController）viewDidLoad方法添加UIBarButtonItem。

self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle: @"Back" 
                  style: UIBarButtonItemStyleBordered 
                  target: navController 
                  action: @selector(onBack)];