swift - Button.isHighlighted 时如何更改边框颜色

Question

我想知道如何在我的 UIButton 周围设置边框，以便在单击或突出显示时更改不透明度及其中的文本。

我的逻辑告诉我，它应该是这样的......但它似乎不起作用:

    //BTN STYLING

    btnstd.layer.cornerRadius = 5
    btnstd.layer.borderWidth = 1.5
    btnstd.layer.borderColor = UIColor.white.cgColor

    //Change bordercolor when highlighted
    if(btnstd.isHighlighted) {
    btnstd.layer.borderColor = UIColor(white:1,alpha:0.3).cgColor
    }

顺便说一句，这是放在我的 ViewDidLoad() 函数中的

Answer 1

您正在寻找的操作是 .touchDown 和任何 .touchUp:

override func viewDidLoad() {
    super.viewDidLoad()
    theButton.setTitle("Normal", for: .normal)
    theButton.setTitle("Highlighted", for: .highlighted)
    theButton.layer.borderColor = UIColor.red.cgColor
    theButton.layer.borderWidth = 1
    theButton.addTarget(self, action: #selector(startHighlight), for: .touchDown)
    theButton.addTarget(self, action: #selector(stopHighlight), for: .touchUpInside)
    theButton.addTarget(self, action: #selector(stopHighlight), for: .touchUpOutside)
}
func startHighlight(sender: UIButton) {
    theButton.layer.borderColor = UIColor.green.cgColor
    theButton.layer.borderWidth = 1
}
func stopHighlight(sender: UIButton) {
    theButton.layer.borderColor = UIColor.red.cgColor
    theButton.layer.borderWidth = 1
}