如何生成一个自定义的UIView，它位于UIImageView的上方，中间打了一个圆形的洞，可以看到UIImageView？

import UIKit

class CustomView: UIView {
    override init(frame: CGRect) {
        super.init(frame: frame)
        self.backgroundColor = UIColor.clear
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.backgroundColor = UIColor.clear
    }
    
    override func draw(_ rect: CGRect) {
        super.draw(rect)
        
        let path = UIBezierPath(roundedRect: rect, cornerRadius: 0)
        let circlePath = UIBezierPath(roundedRect: CGRect(x: rect.midX - 50, y: rect.midY - 50, width: 100, height: 100), cornerRadius: 50)
        path.append(circlePath)
        path.usesEvenOddFillRule = true
        
        let maskLayer = CAShapeLayer()
        maskLayer.path = path.cgPath
        maskLayer.fillRule = .evenOdd
        
        self.layer.mask = maskLayer
    }
}

// 在使用的地方添加以下代码
let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
imageView.image = UIImage(named: "your_image_name")

let customView = CustomView(frame: imageView.frame)
imageView.superview?.addSubview(customView)