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Dealing with an Objective C iOS app (working fine); when I start to set some Core Data entities up, as soon as I compile I get this error message:

The “Swift Language Version” (SWIFT_VERSION) build setting must be set to a supported value for targets which use Swift. This setting can be set in the build settings editor.

I am using Xcode Version 9.4.1 and there is no SWIFT_VERSION in the build settings editor. And if I eliminate the Core Data entity I just set up, the problem goes away.

I'd be happy if someone had an explanation and told me what to do. I am somewhat surprised to see this message related to “Swift Language Version”, when my app is only in Objective C. But I presume some dependency may be using Swift.

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  • Please search Swift Language Version in Build Settings. or search only swift in Build Settings if you found any setting that related to version you can also manually write 4.1 in that. Commented Sep 10, 2018 at 5:17

2 Answers 2

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Can you please check into your build setting about Swift version. Because I too have a project which is in Objective C but still we need to set Swift version in build setting. Please check Attached image enter image description here

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I do not have what you have after User-Defined.
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Go to Targets

--> select Build setting

--> search swift language version (top right)

-->In Swift Language Version change version

See below screen shot.

enter image description here

See my updated screen shot

enter image description here

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6 Comments

I only can see SWIFT_ACTIVE_COMPILATION_CONDITIONS, I do not have any "Swift Language Version", we must have a somewhat different environment.
Try to search "swift compiler "
Actually I got in both my swift and objective c projects
Xcode Version 9.4.1. I basically can't find anything Swift.
@Michel are you sure you’re in target (not project) settings?
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