如何将CAshapeLayer放入按钮中？

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建CAShapeLayer对象，绘制一个圆形
        let shapeLayer = CAShapeLayer()
        let circlePath = UIBezierPath(ovalIn: CGRect(x: 0, y: 0, width: 100, height: 100))
        shapeLayer.path = circlePath.cgPath
        shapeLayer.fillColor = UIColor.red.cgColor
        
        // 创建UIButton对象，并设置其frame和其他属性
        let button = UIButton(type: .custom)
        button.frame = CGRect(x: 100, y: 100, width: 100, height: 100)
        button.setTitle("Button", for: .normal)
        button.setTitleColor(UIColor.white, for: .normal)
        button.backgroundColor = UIColor.blue
        
        // 将CAShapeLayer添加到UIButton的layer中
        button.layer.addSublayer(shapeLayer)
        
        // 为按钮添加点击事件的处理函数
        button.addTarget(self, action: #selector(buttonTapped), for: .touchUpInside)
        
        // 将按钮添加到视图中
        view.addSubview(button)
    }
    
    @objc func buttonTapped() {
        // 点击按钮后的处理逻辑
        print("Button tapped")
    }
}