How to do a native “Pulse effect” animation on a UIButton - iOS

Question

I would like to have some kind of pulse animation (infinite loop \"scale in - scale out\") on a UIButton so it gets users\' attention immediately.

I saw this link Ho

Answer 1

func animationScaleEffect(view:UIView,animationTime:Float)
{
    UIView.animateWithDuration(NSTimeInterval(animationTime), animations: {

        view.transform = CGAffineTransformMakeScale(0.6, 0.6)

        },completion:{completion in
            UIView.animateWithDuration(NSTimeInterval(animationTime), animations: { () -> Void in

                view.transform = CGAffineTransformMakeScale(1, 1)
            })
    })

}


@IBOutlet weak var perform: UIButton!

@IBAction func prefo(sender: AnyObject) {
    self.animationScaleEffect(perform, animationTime: 0.7)
}