UITabBarController - 如何访问视图控制器？

问题描述

我有一个uitabbarcontroller，它包含多个标签和viewControllers。
我试图遍历视图控制器以找到正确的方法并调用方法。
但是我得到的视图控制器的类型，每次循环都是UINavigationController。那么我怎样才能简单地访问我的tabBar中的视图控制器？

I have a uitabbarcontroller, which contains multiple tabs and viewControllers.I am trying to loop through the view controllers to find the right one and call a method.but the type of the view controller i get, each time i go through the loop is a UINavigationController. So how can i simply access a view controller in my tabBar?

for (UIViewController *v in self.tabBar.viewControllers)
{
     if ([v isKindOfClass:[MyViewController class]])
     {
          MyViewController *myViewController = v;
          [v doSomething];
     }
}

推荐答案

你很可能在Tabs的根目录下有UINavigationControllers，所以你要做的就是访问UINavigationController显示的ViewController。

You most likely have UINavigationControllers at the root of your Tabs, so what you will want to do is access the ViewController displayed by the UINavigationController.

尝试将代码更改为以下内容：

Try changing the code to the following:

for (UIViewController *v in self.tabBar.viewControllers) {

     UIViewController *vc = v;

     if ([v isKindOfClass:[UINavigationController class]]) {
         vc = [v visibleViewController];
     }

     if ([vc isKindOfClass:[MyViewController class]]) {
          MyViewController *myViewController = vc;
          [vc doSomething];
     }
}

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