Xcode 8.3 can't support Swift 2.3 [closed]

Answer 1

It is said in release note clearly that Xcode 8.3 doesn't support swift 2.x any more. You can either choose to use wizard to update your code to swift 3.1, or go back to Xcode 8.2.1.

https://developer.apple.com/library/content/releasenotes/DeveloperTools/RN-Xcode/Chapters/Introduction.html

Answer 2

That's true. You have to convert your code to Swift 3. Or try to download a lower version of Xcode.