How to cut a specific part from my CALayer - swift

Question

I have a UIView. My UIView has a layer. I added another layer to it. I need to cut a circle in this layer when the user moves his finger to create a drawing effect. I will leave my code, but it is not correct, as it creates a circle once.
class CustomImageView: UIImageView {
private var recognizer: UIPanGestureRecognizer!
private var maskLayer: CALayer!
override init(frame: CGRect) {
super.init(frame: frame)
setup()
}
private func setup() {
self.isUserInteractionEnabled = true
recognizer = UIPanGestureRecognizer(target: self, action: #selector(swipeGesture))
self.addGestureRecognizer(recognizer)
maskLayer = CALayer()
maskLayer.backgroundColor = UIColor.black.withAlphaComponent(0.6).cgColor
maskLayer.frame = self.bounds
self.layer.insertSublayer(maskLayer, at: 0)
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setup()
}
private func crateMask(location: CGPoint, layer: CALayer) {
let maskFrame = CGRect(origin: CGPoint(x: location.x - 25 , y: location.y - 25 ), size: CGSize(width: 50, height: 50))
layer.createMask(maskRect: maskFrame, invert: true)
}
#objc func swipeGesture(sender: UIPanGestureRecognizer) {
let location = sender.location(in: self)
print(location)
crateMask(location: location, layer: self.maskLayer )
}
}
extension CALayer {
func createMask(maskRect: CGRect, invert: Bool = false) {
print(maskRect)
let maskLayer = CAShapeLayer()
let path = CGMutablePath()
if (invert) {
path.addRect(self.bounds)
}
let cornerRadius = maskRect.height / 2
path.addRoundedRect(in: maskRect, cornerWidth: cornerRadius, cornerHeight: cornerRadius)
maskLayer.path = path
if (invert) {
maskLayer.fillRule = CAShapeLayerFillRule.evenOdd
}
self.mask = maskLayer
}
}
Here is the screen shot of the UI: https://prnt.sc/ozki6s
Any help will be appreciated! Thanks in advance.