extension UIView {
    func addDashedCircle() {
        let circleLayer = CAShapeLayer()
        circleLayer.path = UIBezierPath(ovalIn: bounds).cgPath
        circleLayer.lineWidth = 2.0
        circleLayer.strokeColor =  UIColor.red.cgColor//border of circle
        circleLayer.fillColor = UIColor.white.cgColor//inside the circle
        circleLayer.lineJoin = .round
        circleLayer.lineDashPattern = [6,3]
        layer.addSublayer(circleLayer)
    }
}