如何在WKWebview中创建按钮刷新页面

import UIKit
import WebKit

class ViewController: UIViewController {
    
    var webView: WKWebView!
    var refreshButton: UIButton!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 初始化WKWebView
        webView = WKWebView(frame: self.view.frame)
        self.view.addSubview(webView)
        
        // 加载网页
        if let url = URL(string: "https://www.example.com") {
            let request = URLRequest(url: url)
            webView.load(request)
        }
        
        // 创建刷新按钮
        refreshButton = UIButton(type: .system)
        refreshButton.setTitle("刷新", for: .normal)
        refreshButton.addTarget(self, action: #selector(refreshWebView), for: .touchUpInside)
        
        // 设置按钮位置
        refreshButton.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(refreshButton)
        NSLayoutConstraint.activate([
            refreshButton.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            refreshButton.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 20)
        ])
    }
    
    @objc func refreshWebView() {
        webView.reload()
    }
}