如何从uitabbarcontroller访问viewcontroller的任何代码示例? [英] any code example of how access viewcontroller from uitabbarcontroller?

问题描述

我是iPhone开发的新手

I'm new with iphone development

我使用其视图控制器的tabbar和tabbaritems创建了情节提要

I created my storyboard with tabbar and tabbaritems with their viewcontroller

但是现在我想从uitabbarcontroller.m中访问viewcontroller实例.

but now I would like to access viewcontroller instances from my uitabbarcontroller.m

有人有带有示例代码的网址吗?

anybody have any url with code example?

我发现的代码非常易于使用或使用标签栏，大部分只是情节提要，对任何事情都无济于事...

the codes I find are very simple use or tabbar, mostly just the storyboard which doesn't help in anything...

谢谢

-在穆勒的帮助下解决方案

---solution after help from Muller

在uitabbarcontroller上:(我放置了一个断点，并能够检索视图控制器的集合)

on the uitabbarcontroller:(I placed a breakpoint and was able to retrieve the collection of viewcontrollers)

    - (void)viewDidLoad
    {
       NSArray *arr = self.viewControllers;
    }

---

推荐答案

您可以使用类似

NSArray *array = [tabBarControllerName viewControllers];

这将返回tabBarController中所有视图的数组，因此，如果您的第一个视图属于类，那么假设TestView我们可以做类似

This returns an array of all the views within your tabBarController, so if your first view is of class, let's say TestView we could do something like

TestView *tv = (TestView *)[array objectAtIndex:0];

请注意，这不在我的脑海中，所以可能有点不对劲.确保检查出Apple提供的类参考资料:

Note that this is off the top of my head, so it may be a little off. Make sure you check out the class reference materials that apple provides: UITabBarController Class Reference

您真的可以像这样单行:

You could really just one-line it like this:

TestView *tv = (TestView *)[[tabBarControllerName viewControllers] objectAtIndex:0];

如果您通过以下方式在您的AppDelegate中声明了UITabBarController，则可以访问它:

You can access the UITabBarController if it is declared in your AppDelegate by:

AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
TestView *tv = (TestView *)[[[appDelegate tabBarController] viewControllers] objectAtIndex:0]; 

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