ios js交互

webView.navigationDelegate = self
...

func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
    let jsCode = "alert('Hello, World!');"
    webView.evaluateJavaScript(jsCode) { (result, error) in
        if let error = error {
            print("JavaScript execution error: \(error)")
        }
    }
}

class ViewController: UIViewController, WKScriptMessageHandler {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let contentController = WKUserContentController()
        contentController.add(self, name: "nativeHandler")
        
        let config = WKWebViewConfiguration()
        config.userContentController = contentController
        
        let webView = WKWebView(frame: .zero, configuration: config)
        view.addSubview(webView)
        
        if let url = URL(string: "https://example.com") {
            webView.load(URLRequest(url: url))
        }
    }
    
    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
        if message.name == "nativeHandler", let messageBody = message.body as? String {
            print("Received message from JavaScript: \(messageBody)")
        }
    }
}

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