How can I switch to Swift 4.0 in Xcode 9.3?
It seems like I have only options to go to 3.3, or unspecified:
Can I switch to 4.0 somehow?
Solution
Make sure you have updated xCode then under Build Settings, check the drop down options for Swift Compiler - Language.
Furthermore, You can download Xcode 8.x and 9.x from Apple Download Portal, if you've premium developer account (apple id). You can install & work with both Xcode 9 and Xcode 8.x in single (mac) system. (Make sure you've Command Line Tools supporting both version of Xcode, to work with terminal)
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