Effect of iOS 7 update on my app

Question

I have an app released on the app store and I am still working on my iOS 7 update. How will the upgrade to iOS 7 affect the version of my app that is already out there? Will the users who have upgraded still be able to use the existing version?

Answer 1

If your app was built with Xcode 4 and the iOS 6 SDK, it will look the same on iOS 7, except for UIAlertViews and UIActionSheets.

If you make an update to your app with Xcode 5 and the iOS 7 SDK, all UI elements will be updated.

Apple hasn't said how much longer you can submit apps using Xcode 4, but it won't be forever.