使用 UIFocusGuide 在 tvOS 中进行对角线聚焦

Question

我认为有 4 个 UIButtons：

四个都是UIButtons，左边两个UIButtons，右边两个。当我 select 向下箭头时，焦点从顶部按钮移动到底部按钮。当我按下向下箭头和向上箭头时，我希望焦点从上到下浏览所有四个按钮，然后再从下到上浏览。我还想在突出显示时更改 UIBUtton 的背景颜色（当前默认为白色）。

我尝试了下面的代码来导航焦点，但我无法得到我想要的。

let focusGuide = UIFocusGuide()
view.addLayoutGuide(focusGuide!) 
focusGuide!.rightAnchor.constraintEqualToAnchor(self.btnPlay.rightAnchor).active = true
focusGuide!.topAnchor.constraintEqualToAnchor(self.switchFirst.topAnchor).active = true
focusGuide!.widthAnchor.constraintEqualToAnchor(self.btnPlay.widthAnchor).active = true
focusGuide!.heightAnchor.constraintEqualToAnchor(self.switchFirst.heightAnchor).active = true
focusGuide!.preferredFocusedView = self.switchFirst

在 viewdidLoad 和

didUpdateFocusInContext 中的以下代码

    guard let nextFocusedView = context.nextFocusedView else { return }

    switch nextFocusedView {
    case self.switchFirst:
        self.focusGuide!.preferredFocusedView = self.btnPlay

    case self.btnPlay:
        self.focusGuide!.preferredFocusedView = self.switchFirst

    case self.switchAudioType:
        self.focusGuide!.preferredFocusedView = self.btnAdd

    case self.btnAddToWishList:
        self.focusGuide!.preferredFocusedView = self.switchSecond

Answer 1

好吧，一种简单的方法是使用 4 种不同的焦点指南。我已经包含了一个非常的基本图像，说明它们将在哪里。焦点指南放置：

// [1] in viewDidLoad
let firstFocusGuide = UIFocusGuide()
view.addLayoutGuide(firstFocusGuide)
firstFocusGuide.leftAnchor.constraintEqualToAnchor(self.btnPlay.leftAnchor).active = true
firstFocusGuide.topAnchor.constraintEqualToAnchor(self.btnPlay.bottomAnchor).active = true
firstFocusGuide.heightAnchor.constraintEqualToAnchor(self.btnPlay.heightAnchor).active = true
firstFocusGuide.widthAnchor.constraintEqualToAnchor(self.switchFirst.widthAnchor).active = true

firstFocusGuide.preferredFocusedView = self.switchFirst

let secondFocusGuide = UIFocusGuide()
view.addLayoutGuide(secondFocusGuide)
secondFocusGuide.rightAnchor.constraintEqualToAnchor(self.switchFirst.rightAnchor).active = true
secondFocusGuide.bottomAnchor.constraintEqualToAnchor(self.switchFirst.topAnchor).active = true
secondFocusGuide.heightAnchor.constraintEqualToAnchor(self.switchFirst.heightAnchor).active = true
secondFocusGuide.widthAnchor.constraintEqualToAnchor(self.switchFirst.widthAnchor).active = true

secondFocusGuide.preferredFocusedView = self.btnPlay

let thirdFocusGuide = UIFocusGuide()
view.addLayoutGuide(thirdFocusGuide)
thirdFocusGuide.leftAnchor.constraintEqualToAnchor(self.btnAdd.leftAnchor).active = true
thirdFocusGuide.bottomAnchor.constraintEqualToAnchor(self.btnAdd.topAnchor).active = true
thirdFocusGuide.heightAnchor.constraintEqualToAnchor(self.btnAdd.heightAnchor).active = true
thirdFocusGuide.widthAnchor.constraintEqualToAnchor(self.switchSecond.widthAnchor).active = true

thirdFocusGuide.preferredFocusedView = self.switchSecond

let fourthFocusGuide = UIFocusGuide()
view.addLayoutGuide(fourthFocusGuide)
fourthFocusGuide.rightAnchor.constraintEqualToAnchor(self.switchSecond.rightAnchor).active = true
fourthFocusGuide.topAnchor.constraintEqualToAnchor(self.switchSecond.bottomAnchor).active = true
fourthFocusGuide.heightAnchor.constraintEqualToAnchor(self.switchSecond.heightAnchor).active = true
fourthFocusGuide.widthAnchor.constraintEqualToAnchor(self.switchSecond.widthAnchor).active = true

fourthFocusGuide.preferredFocusedView = self.btnAdd

请记住，这只允许在四个按钮之间进行 Up 和 Down 移动。更不用说它有点乏味了...希望对您有所帮助！

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