后退按钮不出现在UINavigationController上 [英] Back button not appearing on UINavigationController

问题描述

我在我的AppDelegate中设置了UINavigationController：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {          
    // Add the navigation controller's view to the window and display.
    [self.window addSubview:navigationController.view];
    [self.window makeKeyAndVisible];

    return YES;
}

在我的RootViewController中我将另一个视图推入堆栈： / strong>

In my RootViewController I am pushing another view onto the stack:

//Show the deals
    DealViewController *dvc = [[DealViewController alloc] initWithNibName:@"DealViewController" bundle:nil];
    [self.navigationController.navigationBar setHidden:NO];
    [self.navigationController pushViewController:dvc animated:YES];

视图显示，但没有后退按钮添加到我的导航栏。为什么这是我如何解决它？

The view shows up, but there is no back button that is added to my navigation bar. Why is this and how can I resolve it?

推荐答案

您必须将导航控制器视为一堆导航控制器，一屏充满信息。
使用

You must think of the navigation controller as a stack of navigation controllers each controlling one screen full of information. You instantiate the navigation controller with the

-(id)initWithRootViewController:(UIViewController *)rootViewController

方法。在此调用中指定根视图控制器。

method. You specify the root view controller in this call. Then you add the navigation controller's view as a subview to the window, like you did before.

如果你想显示你的第二个屏幕你推动另一个视图控制器在堆栈使用

If you want to show your second screen you push another view controller on the stack by using

-(void)pushViewController:detailViewController animated:YES

方法。

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