如何在 tvOS 中将焦点从一个按钮移动到另一个按钮? [英] How to move the focus from a button to another in tvOS?

问题描述

我是 tvOS 的新手.我想要一个标准按钮，一旦按下，它就会将焦点移到另一个标准按钮上，我该怎么做(当然，如果可能的话)?

I'm new to tvOS. I would like to have a standard button that once is pressed, it moves the focus to another standard button, how can I do this (if it's possible of course)?

推荐答案

首先使用自定义属性覆盖 viewController 中的 preferredFocusedView:

Start by overriding the preferredFocusedView in your viewController with a custom property:

var myPreferredFocusedView:UIView?
override var preferredFocusedView: UIView? {
    return myPreferredFocusedView:UIView
}

然后，在您的按钮回调中，将 myPreferredFocusedView 设置为下一个应该获得焦点的首选按钮.之后，直接请求焦点更新:

Then, in your button callback, set the myPreferredFocusedView to your next preferred button which should get focus. After that, directly request a focus update:

func buttonCallback(){
    myPreferredFocusedView = button2 // button2 is an example 

    /*
        Trigger the focus system to re-query the view hierarchy for preferred
        focused views.
    */
    setNeedsFocusUpdate()
    updateFocusIfNeeded()
}

这应该会将焦点系统更新到您的另一个按钮.

This should update the focus system to your other button.

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