TypeformVC.swift

import UIKit
import WebKit

class TypeFormVC: UIViewController {
  
  override func viewDidLoad() {
        super.viewDidLoad()
        loadHtml()
  }

  func loadHtml() {
    // Load JS Script with onSubmit handler
    let scriptSource = TypeFormHelper.getTypeFormScript(urlString: urlString, messageHandlerName: formSubmissionHandler)
    let script = WKUserScript(source: scriptSource, injectionTime: WKUserScriptInjectionTime.atDocumentEnd, forMainFrameOnly: true)
        
     // Create content controller to append JS Script
     let contentController = WKUserContentController()
     contentController.addUserScript(script)
        
     // Create configuration and webView
     let config = WKWebViewConfiguration()
     contentController.add(self, name: formSubmissionHandler)
     config.userContentController = contentController
     let webView = WKWebView(frame: view.bounds, configuration: config)
     view = webView
     webView.navigationDelegate = self
        
     // Load embedded HTML typeform file
     if let embeddedHTML = TypeFormHelper.getTypeFormHtml() {
      webView.loadHTMLString(embeddedHTML, baseURL: nil)
     }
  }

}

extension TypeFormVC: WKNavigationDelegate, WKScriptMessageHandler {
    
    // Handle form submission
    
    func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
      if message.name == "formSubmitted" {
        print("Form Submitted")
      }
    }
    
}