如何检测WKWebview更改amp页面的url

import WebKit

class ViewController: UIViewController, WKNavigationDelegate {
    var webView: WKWebView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let configuration = WKWebViewConfiguration()
        webView = WKWebView(frame: view.bounds, configuration: configuration)
        webView.navigationDelegate = self
        view.addSubview(webView)
        
        let url = URL(string: "https://example.com/amp-page")!
        let request = URLRequest(url: url)
        webView.load(request)
    }
    
    // 页面开始加载时调用
    func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!) {
        // 获取当前加载的URL
        if let url = webView.url {
            print("Current URL: \(url)")
        }
    }
    
    // 检测到页面URL变化时调用
    func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
        // 获取新的URL
        if let newURL = navigationAction.request.url {
            // 获取之前的URL
            if let oldURL = webView.url {
                // 比较新旧URL是否相同
                if newURL != oldURL {
                    print("URL changed: \(oldURL) -> \(newURL)")
                    // 进行相应的处理操作
                    // ...
                }
            }
        }
        
        decisionHandler(.allow)
    }
}