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我正在尝试以编程方式构建UIViews .如何在Swift中使用动作功能？UIButton

以下代码不会执行任何操作:

let btn: UIButton = UIButton(frame: CGRectMake(100, 400, 100, 50))
btn.backgroundColor = UIColor.greenColor()
btn.setTitle("Click Me", forState: UIControlState.Normal)
btn.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)
self.view.addSubview(buttonPuzzle)

以下选择器功能是:

func buttonAction(sender: UIButton!) {
    var btnsendtag: UIButton = sender
}