swift 代码添加按钮

   var btn = UIButton(frame: CGRect(x: 200, y: 200, width: 100, height: 100))

  btn.setTitle("jicheng", forState: UIControlState.Normal)

  //btn.setTitleColor(UIColor.blackColor(), forState: UIControlState.Normal)

 // btn.setTitleColor(UIColor.blueColor(), forState: UIControlState.Highlighted)

        

       // btn.setTitleShadowColor(UIColor.greenColor(), forState: UIControlState.Normal)

        //btn.backgroundColor = UIColor.blackColor()

        view.addSubview(btn)