iphone - 将UIBarButtonItem添加到iPhone SDK上的UINavigationController

Question

我想在UINavigationController上添加后退按钮，我正在尝试以下代码:

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];

此代码输出如下:

代码未在UINavigationController中添加“后退按钮”。我正在将代码添加至UINavigationController上的“后退”按钮，我的代码有什么问题...!

请任何人帮我...!

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)];