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

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 https://stackoverflow.com/questions/4910963/how-to-create-a-pulse-effect-using-web-kit-animation-outward-rings but I was wondering if there was any way to do this only using native framework?

CABasicAnimation *theAnimation;
 
theAnimation=[CABasicAnimation animationWithKeyPath:@"opacity"];
theAnimation.duration=1.0;
theAnimation.repeatCount=HUGE_VALF;
theAnimation.autoreverses=YES;
theAnimation.fromValue=[NSNumber numberWithFloat:1.0];
theAnimation.toValue=[NSNumber numberWithFloat:0.0];
[theLayer addAnimation:theAnimation forKey:@"animateOpacity"]; //myButton.layer instead of

Swift

let pulseAnimation = CABasicAnimation(keyPath: #keyPath(CALayer.opacity))
pulseAnimation.duration = 1
pulseAnimation.fromValue = 0
pulseAnimation.toValue = 1
pulseAnimation.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)
pulseAnimation.autoreverses = true
pulseAnimation.repeatCount = .greatestFiniteMagnitude
view.layer.add(pulseAnimation, forKey: "animateOpacity")

[See the article "Animating Layer Content"][1] [1]: https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/CoreAnimation_guide/CreatingBasicAnimations/CreatingBasicAnimations.html#//apple_ref/doc/uid/TP40004514-CH3-SW1

Here is the swift code for it ;)

let pulseAnimation = CABasicAnimation(keyPath: "transform.scale")
pulseAnimation.duration = 1.0
pulseAnimation.fromValue = NSNumber(value: 0.0)
pulseAnimation.toValue = NSNumber(value: 1.0)
pulseAnimation.timingFunction = CAMediaTimingFunction(name: .easeInEaseOut)
pulseAnimation.autoreverses = true
pulseAnimation.repeatCount = .greatestFiniteMagnitude
self.view.layer.add(pulseAnimation, forKey: nil)

The swift code is missing a fromValue, I had to add it in order to get it working.

pulseAnimation.fromValue = NSNumber(value: 0.0)

Also forKey should be set, otherwise removeAnimation doesn't work.

self.view.layer.addAnimation(pulseAnimation, forKey: "layerAnimation")

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)
}