Update old app on itunes connect with Swift

Question

Didn't find any information on this while googling. So I'll ask it here myself.

I am currently working on rebuilding an app that is 4-5 years old, written in Objective-C. I am coding in swift for the updated version of the app.

How will I be able to update the current app on itunes connect? Is it enough to just change the Bundle identifier in the project to the same as the old one?

Or do I have to create the swift files within the old project?

Answer 1

The bundle identifier is the main thing. However, if you write settings to user defaults or files to the documents directory or other directories, you need to make sure that those settings work properly in the old version, or that it's ok to ignore them in the new version.

You should be able to test running the old app store version on a device, then installing the updated version (either from Xcode or from iTunes) and making sure the upgrade process works correctly.