如何在SwiftUI中观察WKWebView的加载进度？

import SwiftUI
import WebKit

class WebViewObserver: NSObject, ObservableObject, WKNavigationDelegate {
    @Published var loadingProgress: Double = 0.0
    
    func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!) {
        // 页面开始加载时调用
        loadingProgress = 0.0
    }
    
    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        // 页面加载完成时调用
        loadingProgress = 1.0
    }
    
    func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) {
        // 页面加载失败时调用
        loadingProgress = 0.0
    }
    
    func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) {
        // 页面加载失败时调用（包括网络问题）
        loadingProgress = 0.0
    }
    
    func webView(_ webView: WKWebView, didReceiveServerRedirectForProvisionalNavigation navigation: WKNavigation!) {
        // 页面重定向时调用
        loadingProgress = 0.5
    }
    
    func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
        // 页面开始加载时调用（包括重定向）
        loadingProgress = 0.1
    }
}

import SwiftUI
import WebKit

struct ContentView: View {
    @StateObject private var webViewObserver = WebViewObserver()
    
    var body: some View {
        VStack {
            Text("Loading Progress: \(webViewObserver.loadingProgress * 100, specifier: "%.0f")%")
            
            WebView()
                .navigationDelegate(webViewObserver)
        }
    }
}

struct WebView: UIViewRepresentable {
    func makeUIView(context: Context) -> WKWebView {
        let webView = WKWebView()
        return webView
    }
    
    func updateUIView(_ uiView: WKWebView, context: Context) {
        let url = URL(string: "https://www.example.com")!
        let request = URLRequest(url: url)
        uiView.load(request)
    }
}