Hello all:
I have 2 apps on the app store written in XCode 6. If I install XCode 7 and Swift 2 wil I need to upgrade the codebase of the existing apps, or will XCode be backward compatible?
John.
XCode 7
Retesting existing projects is advisable.
Presumably you used more than one version os Xcode 6, in which case think of Xcode 7 as just another bump up when it comes to your existing projects. There may be changes, of course, so be ready and as noted/as always, test, test, test.
You did say Swift. I believe Xcode 7 will make non backwards compatible changes to your Swift code when it opens / upgrades your project. So I would recommend keeping the Xcode 7 changes on a branch for now if there's any possibility you will need to submit using Xcode 6 before Xcode 7 is out of beta.
You will need to upgrade the Swift code to Swift 2. Xcode 7 has *NO* support for Swift 1 at all.