ios 调取js

webView.evaluateJavaScript("document.title") { (result, error) in
    if let title = result as? String {
        print("网页标题: \(title)")
    }
    if let error = error {
        print("执行JavaScript时出错: \(error)")
    }
}

window.webkit.messageHandlers.myHandler.postMessage('Hello from JavaScript!');

import WebKit

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