sprite-kit - 如何在 tvOS (AppleTV) 上运行的 View Controller 中设置按钮的初始焦点？

Question

我在 tvOS 的 Swift 游戏中添加了一些按钮。

override func didMoveToView(view: SKView) {

    let button1=UIButton(frame: CGRectMake(330, 800, 300, 100))
    button1(imageBuySelected, forState: UIControlState.Focused)
    button1(imageBuyNormal, forState: UIControlState.Normal
    button1 = UIColor.clearColor()
    button1(self, action: "buy1", forControlEvents: UIControlEvents.PrimaryActionTriggered)
    self.view!.addSubview(button1)

    let button2=UIButton(frame: CGRectMake(330, 800, 300, 100))
    button2(imageBuySelected, forState: UIControlState.Focused)
    button2(imageBuyNormal, forState: UIControlState.Normal
    button2 = UIColor.clearColor()
    button2(self, action: "buy2", forControlEvents: UIControlEvents.PrimaryActionTriggered)
    self.view!.addSubview(button2)

    let button3=UIButton(frame: CGRectMake(330, 800, 300, 100))
    button3(imageBuySelected, forState: UIControlState.Focused)
    button3(imageBuyNormal, forState: UIControlState.Normal
    button3 = UIColor.clearColor()
    button3(self, action: "playGame", forControlEvents: UIControlEvents.PrimaryActionTriggered)
    self.view!.addSubview(button3)
}

比赛开始时。初始焦点设置为 button1。我希望将焦点设置为 button3。我知道首选焦点是根据从屏幕左上角开始找到的第一个可聚焦对象自动选择的。有谁知道如何覆盖它以便我可以在游戏开始时使 button3 成为首选焦点 View ？

Answer 1

我希望这就是你要找的东西，祝你好运! :)

override var preferredFocusedView: UIView? {
    get {
        return self.button3
    }
}