在 Swift 中以编程方式切换标签栏 [英] Switch tab bar programmatically in Swift

问题描述

我有一个标签栏应用程序，我的第一个视图上有一个按钮，我想在按下时以编程方式切换到标签栏中的第二个标签.

我似乎不太明白如何让索引等切换到它我已经尝试过这样的东西.

tababarController.selectedIndex = 1

没有成功.

解决方案

这很简单，tabBarController 被声明为可选类型

var tabBarController: UITabBarController?{ 得到 }

<块引用>

视图控制器层次结构中最近的祖先是标签栏控制器.如果视图控制器或其祖先之一是孩子标签栏控制器，此属性包含拥有的标签栏控制器.如果视图控制器不是，则此属性为零嵌入在标签栏控制器中.

所以你只需要添加?"最后:

@IBAction func goToSecond(_ sender: Any) {tabBarController?.selectedIndex = 1}

I have a tab bar application and i have a button on my first view which i want to when pressed switch to my second tab programmatically in the tab bar.

I can't quite seem to figure it out how to get the index etc to switch to it i've tried stuff like this.

tababarController.selectedIndex = 1

With no success.

解决方案

Thats pretty simple tabBarController is declared as an optional type

var tabBarController: UITabBarController? { get }

The nearest ancestor in the view controller hierarchy that is a tab bar controller. If the view controller or one of its ancestors is a child of a tab bar controller, this property contains the owning tab bar controller. This property is nil if the view controller is not embedded inside a tab bar controller.

So you just need to add "?" at the end of it:

@IBAction func goToSecond(_ sender: Any) {
    tabBarController?.selectedIndex = 1
}

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