如何将circleView进程添加到扩展到所有UIView的UIView？

import UIKit

extension UIView {
    func addCircleView() {
        let circleView = UIView(frame: CGRect(x: 0, y: 0, width: self.bounds.width, height: self.bounds.height))
        circleView.backgroundColor = UIColor.red
        circleView.layer.cornerRadius = min(self.bounds.width, self.bounds.height) / 2
        circleView.clipsToBounds = true
        self.addSubview(circleView)
    }
}

let myView = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
myView.backgroundColor = UIColor.white
myView.addCircleView()