WKWebView script for full content loading

WKWebViewScriptHandler.swift

//Setting the script
extension WebViewCoordinator: WKNavigationDelegate {
    public func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        let script = """
            function isContentFullyRendered() {
                var imgElements = document.images;
                var imgComplete = true;
                for (var i = 0; i < imgElements.length; i++) {
                    if (!imgElements[i].complete) {
                        imgComplete = false;
                        break;
                    }
                }
                var fontComplete = document.fonts.status === 'loaded';
                if (imgComplete && fontComplete) {
                    window.webkit.messageHandlers.renderingFinished.postMessage('Rendering Complete');
                }
            }
            document.addEventListener('DOMContentLoaded', isContentFullyRendered);
            window.addEventListener('load', isContentFullyRendered);
            document.fonts.addEventListener('loadingdone', isContentFullyRendered);
            isContentFullyRendered();
        """
        let renderingCheckScript = """
            \(script)
            """
        webView.evaluateJavaScript(renderingCheckScript, completionHandler: nil)
    }
 }

//Tracking the message handler
extension WebViewCoordinator: WKScriptMessageHandler {
    // Message handler function
    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
        //This is our event!
        if message.name == "renderingFinished" {
            print("Content fully rendered!")
        }
    }
}

 //And just link all handlers on init
 let contentController = WKUserContentController()
 contentController.add(context.coordinator, name: "renderingFinished")
        
 let config = WKWebViewConfiguration()
 config.userContentController = contentController
        
 return WKWebView(frame:.zero, configuration: config)