UIView animate not working on UIView's layers

Question

I simply want to flash a red border around a UIView then fade out to clear, repeatedly. However, the UIView animate method doesn't seem to work.

Is there something special about the layer that prevent UIView animate from working?

public class MyAlertView: UIView {

    convenience init(args: [String]) {
        self.init(frame: CGRect.zero)
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        commonInit()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        commonInit()
    }

    private func commonInit() {
        self.translatesAutoresizingMaskIntoConstraints = false
        
        self.layer.cornerRadius = 10
        
        self.layer.borderColor = UIColor.systemRed.cgColor
        self.layer.borderWidth = 2.5
        
        UIView.animate(withDuration: 0.5, delay: 0.0, options: [.curveEaseInOut, .repeat, .autoreverse], animations: {
            self.layer.borderColor = UIColor.clear.cgColor
        })

    }
}

Answer 1

To animate layers need to use CAAnimations u can use this extension

extension CALayer {
   func addLoopBorderAnimation(from startColor: UIColor, to endColor: UIColor, withDuration duration: Double) {
       let colorAnimation = CABasicAnimation(keyPath: "borderColor")
       colorAnimation.fromValue = startColor.cgColor
       colorAnimation.toValue = endColor.cgColor
       colorAnimation.duration = duration
       colorAnimation.repeatCount = .greatestFiniteMagnitude
       colorAnimation.autoreverses = true
       self.borderColor = endColor.cgColor
    self.add(colorAnimation, forKey: "borderColor")
  }
}

and call

     private func commonInit() {
        self.translatesAutoresizingMaskIntoConstraints = false
        
        self.layer.cornerRadius = 10
        
        self.layer.borderColor = UIColor.systemRed.cgColor
        self.layer.borderWidth = 2.5
        self.layer.addLoopBorderAnimation(from: UIColor.systemRed, to: UIColor.clear, withDuration: 0.5
    }