UIWebView is Deprecated in iOS.

The Appstore started issuing warning mail that apps using UIWebView will be rejected from April-2020, I see in some PDFTron Documentation that UIWebView is being used in PDFTron as mentioned in the link https://www.pdftron.com/documentation/ios/changelog/v6-5-3/, If it is so Is there any plan for doing replacing UIWebview?

Old version of PDFTron use a UIWebView, but new versions (starting with, released in 2017) do not (they use a WKWebView). If you are using an old version of PDFTron, we recommend updating.