I use WKWebView within swiftUI，may I please ask how can I communicate between Javascript in Html5 and webkit? I use userContentController, and also called userContentController.add(messageHandler, name: "messageHandler"), but I couldn't find the webkit property in window property in the Html5，it is undefined. I don't know how to adjust my code, and how to call the webkit to communicate with the webkit to WKWebkit in Javascript, below is my code

 func updateUIView(_ uiView:WKWebView,context:Context) {
        if let url = url, let requestURL=URL(string:url){
            let webConfiguration=WKWebViewConfiguration()
            let userContentController=WKUserContentController()
            webConfiguration.userContentController=userContentController
            
            uiView.load(URLRequest(url:requestURL))
            var cache=URLCache.init()
            URLCache.shared.removeAllCachedResponses()
            URLCache.shared.diskCapacity=0
            URLCache.shared.memoryCapacity=0;            
            userContentController.add(messageHandler, name: "messageHandler")

        }
        
    }