如何在 UINavigationController 中为所有 viewController 添加 UiBarButtonItem

发布于 2024-10-10 00:01:53 字数 586 浏览 2 评论 0原文

我想知道是否可以直接将按钮添加到导航控制器中，或者我必须从推入导航控制器的所有 viewController 添加按钮？

示例：我有 3 个 UIViewController（VC1、VC2 和 VC3），我可以将这些元素推送到 NavigationController (NC) 中。如果我需要为 VC1 添加一个按钮作为右侧导航项，我可以在 VC1 的 viewDidLoad 中编写：

UIBarButtonItem *settingsBtn = [[UIBarButtonItem alloc]initWithTitle:@"Settings" style:UIBarButtonItemStyleBordered target:self action:@selector(settings)];
self.navigationItem.rightBarButtonItem = settingsBtn;

如果我也需要在 NC 上为 VC2 和 VC3 添加此按钮，我必须在 VC2 和 VC3 中添加此代码也并在 VC1、VC2 和 VC3 中指定方法“设置”

是否可以以共享方式添加此按钮？如何将设置方法定义为共享方法？

原文

I wonder if it's possible to add a button directly into a navigation controller, or I have to add button from all viewController pushed into navigation Controller?

Example: I have 3 UIViewController (VC1, VC2 and VC3) and I can push this elements in a NavigationController (NC). If I need to add a button as right navigation item for VC1 I can write in viewDidLoad of VC1 :

UIBarButtonItem *settingsBtn = [[UIBarButtonItem alloc]initWithTitle:@"Settings" style:UIBarButtonItemStyleBordered target:self action:@selector(settings)];
self.navigationItem.rightBarButtonItem = settingsBtn;

If I need this button on NC also for VC2 and VC3 I have to add this code in VC2 and VC3 too and specify method "settings" in VC1,VC2 and VC3

Is it possible to add this button in a shared way? And how can I define settings method as shared method ?

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往昔成烟 2024-10-17 00:01:54

成为 UINavigationController 的委托。

- (void)navigationController:(UINavigationController *)navigationController
      willShowViewController:(UIViewController *)viewController
                    animated:(BOOL)animated {
UIBarButtonItem *settingsBtn = [[UIBarButtonItem alloc]initWithTitle:@"Settings"
                                                               style:UIBarButtonItemStyleBordered
                                                              target:self
                                                              action:@selector(settings)];
viewController.navigationItem.rightBarButtonItem = settingsBtn;
}

Become a delegate of the UINavigationController.

- (void)navigationController:(UINavigationController *)navigationController
      willShowViewController:(UIViewController *)viewController
                    animated:(BOOL)animated {
UIBarButtonItem *settingsBtn = [[UIBarButtonItem alloc]initWithTitle:@"Settings"
                                                               style:UIBarButtonItemStyleBordered
                                                              target:self
                                                              action:@selector(settings)];
viewController.navigationItem.rightBarButtonItem = settingsBtn;
}

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