触摸时如何使UIButton边框闪烁

Question

到目前为止，边框在触摸时闪烁以匹配文本，但按下后边框不会恢复为白色。我不知道如何在按下时使边框闪烁（在@IBAction函数中启动）我相信它与按钮的触摸有关Up Inside发送的活动。

@IBAction func buttonSearchAction(sender: AnyObject) {

    let myColor : UIColor = UIColor(red: (255/255.0), green: (255/255.0), blue: (255/255.0), alpha: 0.5)
    buttonSearch.layer.borderColor = myColor.CGColor
}

Answer 1

:hi Identifier
Identifier     xxx term=underline ctermfg=208 guifg=#FD971F

Answer 2

与Swift中的上述解决方案相同：

myButton.addTarget(self, action: "unhighlightBorder", forControlEvents: UIControlEvents.TouchDown);

myButton.addTarget(self, action: "highlightBorder", forControlEvents: UIControlEvents.TouchUpInside);

func unhighlightBorder(){
    myButton.layer.borderColor = UIColor.greenColor().CGColor;
}

func highlightBorder(){
    myButton.layer.borderColor = UIColor.blueColor().CGColor;
}