00_Blog - App wrapping a website with Xamarin

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01_ViewDidLoad_LoadWebsite.cs

public override async void ViewDidLoad ()
{
  base.ViewDidLoad();

  // Set to background color of website to load, so you don't get a white flash while loading the page
  WebView.BackgroundColor = new UIColor(0, 0.635f, 0.925f, 1.0f); // equals #e3ebf3
  
  // Prevent bounces so it feels more like an actual app
  WebView.ScrollView.Bounces = false;
  
  // Load the actual page
  WebView.LoadRequest (new NSUrlRequest (new NSUrl ("https://example.com")));
}

02_ShouldStartLoad.cs

public override void ViewDidLoad ()
{
  WebView.ShouldStartLoad = (webView, request, navigationType) => 
  {
    // ...
    return true; // Notify the WebView that it can handle the request
  };
}

03_ShouldStartLoad.cs

public override void ViewDidLoad ()
{
  WebView.ShouldStartLoad = (webView, request, navigationType) => 
  {
    if (this.OpenInMDMBrowser(request))
    {
      // Naive implementation to change the URL scheme
      UIApplication.SharedApplication.OpenUrl(
        new NSUrl(
          request.Url.AbsoluteString.Replace("http://", "mdmbrowser://").Replace("https://", "mdmbrowser://")
        )
      );
      
      return false; // Notify the WebView that we handled the action ourselves
    }
    return true; // Notify the WebView that it can handle the request
  };
}

04_PreventLinks.cs

WebView.ShouldStartLoad = (webView, request, navigationType) => 
{
  if (this.IsPasswordChange(request))
  {
    var alertController = UIAlertController.Create("Change password",
        "You can't change your password through this app.", UIAlertControllerStyle.Alert);

    // Add action
    alertController.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));

    // Present alert
    PresentViewController(alertController, true, null);

    return false; // Notify the WebView that we handled the action ourselves
  }
  return true;
};