wkwebview 监听js

import UIKit
import WebKit

class ViewController: UIViewController, WKScriptMessageHandler {
    var webView: WKWebView!

    override func viewDidLoad() {
        super.viewDidLoad()
        
        let config = WKWebViewConfiguration()
        config.userContentController.add(self, name: "callbackHandler")
        
        webView = WKWebView(frame: self.view.frame, configuration: config)
        self.view.addSubview(webView)
        
        if let url = URL(string: "https://example.com") {
            let request = URLRequest(url: url)
            webView.load(request)
        }
    }

    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
        if message.name == "callbackHandler", let messageBody = message.body as? String {
            print("Received message from JS: \(messageBody)")
        }
    }
}

window.webkit.messageHandlers.callbackHandler.postMessage("Hello from JavaScript!");

func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
    // 网页加载完成后的处理
}