diff --git a/demos/mobile/ios/Blockly WebView/ViewController.swift b/demos/mobile/ios/Blockly WebView/ViewController.swift
index 6a8f2418d..dee718c07 100644
--- a/demos/mobile/ios/Blockly WebView/ViewController.swift	
+++ b/demos/mobile/ios/Blockly WebView/ViewController.swift	
@@ -9,7 +9,7 @@
 import UIKit
 import WebKit
 
-class ViewController: UIViewController {
+class ViewController: UIViewController, WKUIDelegate {
     /// The name used to reference this iOS object when executing callbacks from the JS code.
     /// If this value is changed, it should also be changed in the `CODE_GENERATOR_BRIDGE_JS` file.
     fileprivate static let HOST_HTML = "Blockly/webview.html"
@@ -18,21 +18,60 @@ class ViewController: UIViewController {
     
     override func viewDidLoad() {
         super.viewDidLoad()
+        webView.uiDelegate = self
         // Do any additional setup after loading the view, typically from a nib.
-        loadWebView()
+        loadWebContent()
     }
     
-    func loadWebView() {
+    func loadWebContent() {
         if let htmlUrl = Bundle.main.url(forResource: "webview", withExtension: "html", subdirectory: "Blockly") {
             webView.load(URLRequest.init(url: htmlUrl))
         }
     }
 
+    func webView(_ webView: WKWebView,
+                 runJavaScriptAlertPanelWithMessage message: String,
+                 initiatedByFrame frame: WKFrameInfo,
+                 completionHandler: @escaping () -> Void) {
+        
+        let alert = UIAlertController(title: nil, message: message, preferredStyle: .alert)
+        let title = NSLocalizedString("OK", comment: "OK Button")
+        let ok = UIAlertAction(title: title, style: .default) { (action: UIAlertAction) -> Void in
+            alert.dismiss(animated: true, completion: nil)
+        }
+        alert.addAction(ok)
+        present(alert, animated: true)
+        completionHandler()
+    }
+    
+    func webView(_ webView: WKWebView,
+                 runJavaScriptConfirmPanelWithMessage message: String,
+                 initiatedByFrame frame: WKFrameInfo,
+                 completionHandler: @escaping (Bool) -> Void) {
+        
+        let alert = UIAlertController(title: nil, message: message, preferredStyle: .alert)
+        let closeAndHandle = { (okayed: Bool) in
+            alert.dismiss(animated: true, completion: nil)
+            completionHandler(okayed)
+        }
+        
+        let okTitle = NSLocalizedString("OK", comment: "OK button title")
+        let ok = UIAlertAction(title: okTitle, style: .default) { (action: UIAlertAction) -> Void in
+            closeAndHandle(true)
+        }
+        alert.addAction(ok)
+        
+        let cancelTitle = NSLocalizedString("Cancel", comment: "Cancel button title")
+        let cancel = UIAlertAction(title: cancelTitle, style: .default) { (action: UIAlertAction) -> Void in
+            closeAndHandle(false)
+        }
+        alert.addAction(cancel)
+        present(alert, animated: true)
+    }
+    
     override func didReceiveMemoryWarning() {
         super.didReceiveMemoryWarning()
         // Dispose of any resources that can be recreated.
     }
-
-
 }