单击UITabBarController时的自定义操作 [英] Custom action when clicking on UITabBarController

问题描述

我有一个标签栏控制器，其中添加了四个导航控制器。导航控制器在选项卡栏控制器中显示为选项卡栏项目。现在我想在标签栏中添加第五个按钮，它不会打开另一个视图，但会触发一些自定义代码。我想在点击该标签栏项目时显示一个重叠的共享菜单，无论用户在哪四个页面中。我该怎么做？

I have a Tab Bar Controller with four navigation controllers added to it. The navigation controllers appear as Tab Bar Items in the Tab Bar Controller. Now I want to add a fifth button to the tab bar, that does not open another view, but triggers some custom code. I want to display an overlaying "share menu" when clicking that Tab Bar Item regardless on which of the four pages the user is. How can I do that?

推荐答案

我可以建议将虚拟UIViewController添加到最后一个索引并处理UITabBarControllerDelegate

I can suggest to add dummy UIViewController to the last index and handle UITabBarControllerDelegate

- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {

    if ([viewController == ...your dummy view controller...]) {

        //Your custom action

        return NO;
    }

    return YES;
}

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