SWIFT: BUTTTON CLICK CHANGE THE TOUCH EFFECT

func fadeButton(button:UIButton){

        UIView.animateWithDuration(3.0, delay: 0.0, options: UIViewAnimationOptions.CurveEaseOut, animations: {

            button.alpha = 0.3

            }, completion: {

                (finished: Bool) -> Void in

                // Fade in

                UIView.animateWithDuration(1.0, delay: 0.0, options: UIViewAnimationOptions.CurveEaseIn, animations: {

                    button.alpha = 1.0

                    }, completion: nil)

        })

    }