如何在swift中获取带URL的JS事件处理程序

import WebKit

class ViewController: UIViewController, WKNavigationDelegate {
    var webView: WKWebView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        webView = WKWebView(frame: view.bounds)
        webView.navigationDelegate = self
        view.addSubview(webView)
    }
}

override func viewDidLoad() {
    super.viewDidLoad()
    
    webView = WKWebView(frame: view.bounds)
    webView.navigationDelegate = self
    view.addSubview(webView)
    
    if let url = URL(string: "https://example.com") {
        let request = URLRequest(url: url)
        webView.load(request)
    }
}

func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
    webView.evaluateJavaScript("document.getElementById('button').onclick = function() { window.location.href = 'https://example.com/event' }") { (result, error) in
        if let error = error {
            print("Failed to set JS event handler: \(error)")
        }
    }
}

func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
    if let url = navigationAction.request.url, url.absoluteString == "https://example.com/event" {
        // 处理JS事件
        print("JS事件被触发")
        
        // 可以在这里执行相应的操作，如跳转到其他页面或执行其他逻辑
        
        decisionHandler(.cancel)
        return
    }
    
    decisionHandler(.allow)
}