swift创建第一个UIButton 并增加点击事件

var button1 = UIButton(frame: CGRectMake(100, 200, 100, 40))

        button1 .setTitle("first button", forState:UIControlState.Normal)

        button1.addTarget(self, action: "firstSwift:", forControlEvents: UIControlEvents.TouchUpInside)

        self.view.addSubview(button1)

        button1.backgroundColor=UIColor.yellowColor()

        button1.setTitleColor(UIColor.blackColor(), forState: UIControlState.Normal)

func firstSwift(sender:UIButton)

    {

       println("第一个button的点击事件")

    }