Unable to Resolve Deprecation of UIWebView warning while uploading Xamarin application - xamarin

Question

I Have followed the blog https://devblogs.microsoft.com/xamarin/uiwebview-deprecation-xamarin-forms/ to remove the UIWebView dependency in my project.
According to the document
1)xamarin.forms version is 4.6
2)xamarin.ios version is 13.20
3)I added the command in mtouch Arguments and linker is link All
I still got warning while upoading build to test flight
I then followed this document https://learn.microsoft.com/en-us/xamarin/ios/release-notes/13/13.16#help-with-uiwebview-deprecation where we can find out whether UIWebView is still being used in our application.I am getting below in the build output.
MTOUCH : warning MT1502: One or more reference(s) to type 'UIKit.UIWebView' already exists inside 'Xamarin.Forms.Platform.iOS, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null' before linking
I am not sure why there is reference in Xamarin.Forms.Platform.iOS as xamarin package is updated to 4.6 as per the blog.
Can anyone please help me to get rid of this warning?

Answer 1

Please follow this link
simply go to your iOS project, open the project properties and add this flag in the
'additional mtouch arguments field: --optimize=experimental-xforms-product-type' in your

Answer 2

Use WKWebView instead of UIWebView. UIWebView has been deprecated and Now The App Store will no longer accept new apps using UIWebView as of April 2020.
using System.IO;
using CustomRenderer;
using CustomRenderer.iOS;
using Foundation;
using UIKit;
using WebKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;
[assembly: ExportRenderer(typeof(CustomWebView), typeof(WebViewRender_iOS))]
namespace CustomRenderer.iOS
{
public class WebViewRender_iOS : WkWebViewRenderer
{
WKUserContentController userController;
protected override void OnElementChanged(VisualElementChangedEventArgs e)
{
base.OnElementChanged(e);
if (e.OldElement != null)
{
userController.RemoveAllUserScripts();
userController.RemoveScriptMessageHandler("invokeAction");
CustomWebView hybridWebView = e.OldElement as CustomWebView;
hybridWebView.Cleanup();
}
if (e.NewElement != null)
{
CustomWebView hybridWebView = e.NewElement as CustomWebView;
LoadRequest(new NSUrlRequest(new NSUrl(hybridWebView._WebURI)));
}
}
}
}

Answer 3

There are a few different changes that need to be made for the deprecation warning to go away.
The build configuration used to upload to the store (Release|iPhone, App Store|iPhone, etc.) in iOS Build section needs the following additional mtouch arguments --optimize=experimental-xforms-product-type
The app needs to use Xamarin.Forms version >= 4.5 or >= 4.6 if using Material Visual
It also needs to be using Xamarin.iOS 13.10.0.17 or higher, which is included with Visual Studio for Mac 8.4.1 and Visual Studio 16.4.3.
Remove all references to UIWebView in the codebase
More info is included in the docs and if that doesn't resolve the issue the app may be using a third-party library with a reference to UIWebView that either needs updating to a version without it or removed altogether from the app.

Answer 4

Thank you all for your suggestions. Below is what worked for me.
Follow the 3 steps mentioned in
https://devblogs.microsoft.com/xamarin/uiwebview-deprecation-xamarin-forms/
Run grep -r UIWebview . on repository level. It will show the list of references in .sln and third party packages
Remove or update third party libraries. Igore bin and obj folders
For Me, I had to
1.Remove deprecated scanbot.xamarin.ios SDK and add scanbot.xamarin pkg
2.Remove hockey app SDK as it was deprecated and didn’t have any updates
3.Remove googleanalytics SDK as it wasn’t being used in the project