ITMS-90809: Deprecated API Usage - Apple will no longer accept submissions of new apps that use UIWebView as of April 30, 2020 and app updates that use UIWebV
In Terminal, run this command in your iOS project folder:
grep -r "UIWebView" .
It will show all the files that uses UIWebview. Update whatever files to use WKWebView. If your pod libraries are showing that it has UIWebView. Update the pods files as well.
FYI it took me 6 hours to fix my project to use WKWebView since I had to update the pods files and had to fix a lot of code.