How to make UIImageView blink/flash animation infinite?

Use the following code to get image animation like a blink.

Image Blink (Using image view hide/show):-

override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(self.alarmAlertActivate), userInfo: nil, repeats: true)
    }

    @objc func alarmAlertActivate(){
        myImage.isHidden = !myImage.isHidden
    }

Image Blink (Using image view alpha):-

override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        Timer.scheduledTimer(timeInterval: 0.7, target: self, selector: #selector(self.alarmAlertActivate), userInfo: nil, repeats: true)
    }

@objc func alarmAlertActivate(){
        UIView.animate(withDuration: 0.7) {
            self.alarmImage.alpha = self.alarmImage.alpha == 1.0 ? 0.0 : 1.0
        }
    }

You could animate the opacity of the image view repeatedly. Something like:

UIView.animate(withDuration: 2.0,
                      delay: 0,
                    options: [.repeat, .autoreverse],
                 animations: { imageView.alpha = 0 }
              )