I have the source code for an app that works on iOS 6. Can an app or tool convert the source code to work on modern iOS? I am not a coder, so I won't be able to convert it manually. Any help will be appreciated.
How to Convert an iOS 6 xcode source files to work on iOS 16 for a non-coder?
There is no automatic conversion. You will have to convert API calls that changed (there are probably a lot) manually.
The first issue you will face will be to open the project in a recent Xcode, as Xcode will require you update using older versions of Xcode that may not run on your Mac.
However, I found a workaround described here that may help: https://developer.apple.com/forums/thread/685565?answerId=682858022#682858022