Update Objective-C app to a Swift app

Question

I have an app in App Store, that was written in Objective-C. Now I developed a Swift project app for the same purpose. Can I replace the Objective-C app to the latest Swift app as like giving an update? A new app is not in mind.

Answer 1

As long as the app is good enough to pass Apple's review guidelines, they don't care which language(s) Xcode compiled to get the result. You can even submit an update built with a mix of Objective C, C, and Swift.

But users might care if an update is buggier or has less features. So test. Also note that (currently) the Swift app bundle may be larger, if that makes any difference to you or your users.