tvOS按钮操作

Question

我通过Swift在tvOS中创建一个UIButton

let randomBtn = UIButton()
randomBtn.setTitle("Zufällig", forState: .Normal)
let RndNormal = UIImage(named: "RndNormal")
let RndHoover = UIImage(named: "RndHoover")
randomBtn.setImage(RndNormal, forState: .Normal)
randomBtn.setImage(RndHoover, forState: .Focused)
randomBtn.setTitleColor(UIColor.blackColor(), forState: .Normal)
randomBtn.setTitleColor(UIColor.whiteColor(), forState: .Focused)

randomBtn.addTarget(self, action: #selector(ViewController.click(_:)), forControlEvents: UIControlEvents.TouchUpInside)

let screenSize: CGRect = UIScreen.mainScreen().bounds
let screenWidth = screenSize.width
randomBtn.frame = CGRect(x: screenWidth - 150, y: 60 , width: 70 , height: 70)
self.view.addSubview(randomBtn)

但是如果我按下按钮，动作就不会被触发，tvOS有什么不同吗？

func click(sender: UIButton) {
    print("click")
}

Answer 1

在按钮操作的tvOS中，UIControlEvents TouchUpInside将不会调用。

你必须像下面这样使用UIControlEvents PrimaryActionTriggered。

randomBtn.addTarget(self, action: #selector(ViewController.click(_:)), forControlEvents: UIControlEvents. PrimaryActionTriggered)

如果您有任何困惑，也请参考此链接

https://forums.developer.apple.com/thread/17925

Answer 2

randomBtn.addTarget(self, action: #selector(ViewController.click(_:)), forControlEvents: UIControlEvents.PrimaryActionTriggered)

解决了它，这只是另一个UIControlEvents