How do I keep using Swift 2.3, instead of 3.0, Xcode updated and can't build anymore

Question

I am developing an app with 20+ framework dependencies and not all of them are on 3.0 yet. So I want to keep using Swift 2.3. However, after updating my Xcode to 8.0, I can no longer build my app. It fails with the following error:

“Use Legacy Swift Language Version” (SWIFT_VERSION) is required to be configured correctly for targets which use Swift. Use the [Edit > Convert > To Current Swift Syntax…] menu to choose a Swift version or use the Build Settings editor to configure the build setting directly.

I don't want to convert the whole project to 3.0 yet.

So my question is how do I keep everything same after Xcode 8.0 update?

Answer 1

In case you want to use Swift 2.3 you should go to Build Settings -> Use Legacy Swift Language Version -> YES this will help you to achieve it. after building the app, there will be minor syntax issues. After fixing (not so hard) it will go as usual