swiftxcodeswift4xcode9.2swift4.1

Xcode 9.2 is not showing Swift 4.1

Apple compatibility documentation is mentioning that:

Swift 4.1, the default version of Swift that’s included in Xcode 9.2.

Yet, using Xcode Version 9.2 (9C40b), the choice of Swift Language Version that I have are 3.2 and 4.0:
Swift Language Version dropdown

Is it a mistake in the documentation or a problem in Xcode? Can I use Swift 4.1 with Xcode 9.2? Will I be able to submit to AppStore using it?

Solution

  • Apple documentation was incorrect, Swift documentation is correct.

    Well, to be double sure of which version is supported, we'll test it:

    1. Set your command-line tools to xcode 9.2 (9C40b). It will switch to Xcode default swift version.

      sudo xcode-select --switch /Applications/Xcode.app

    2. Test your swift version.

      swift --version

    Result is:

    Apple Swift version 4.0.3 (swiftlang-900.0.74.1 clang-900.0.39.2)

    In conclusion, it's really an Apple documentation issue:
    Swift 4.1 is only natively available using Xcode 9.3+

    Update: 3 months later

    With the release of Xcode 10 on June 4th 2018, Apple documentation was finally correctly updated, stating that Swift 4.2 is available using Xcode 10.0+.