Swift 4.0 modules were fine in Swift 3.2 apps with Xcode 9.0.
But now, with Xcode 9.1, I get:
Module compiled with Swift 4.0 cannot be imported in Swift 3.2.1
Or:
Module compiled with Swift 4.0 cannot be imported in Swift 4.0.1
- I had this error message, too, and it turned out to be caused various syntax errors in my code. Once I fixed the syntax errors, the error went away.piccy– piccy2017-11-06 17:00:24 +00:00Commented Nov 6, 2017 at 17:00
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3 Answers
Swift 4.0 is compatible with Swift 3.2 only.
Swift 4.0.1 is compatible with Swift 3.2.1 only.
So:
- you can't mix 4.0 and 3.2.1
- you can't mix 4.0.1 and 3.2
- you can't mix 4.0 and 4.0.1
- you can't mix 3.2.1 and 3.2
To formulate it differently:
- you can mix Xcode 9.0 supported Swift versions together
- you can mix Xcode 9.1 supported Swift versions together
- you can't mix Xcode 9.0 and Xcode 9.1 Swift versions
If the module was built by you, simply rebuild it with the same Xcode.
If the module was built by a third party, request an Xcode 9.1 compatible build.
Comments
It's possible to build using Swift 3.2 in Xcode 9.1 beta 2 by installing the Xcode 9.0 toolchain and using that to build your project.
Then choose the Swift 4.0 release under the Xcode -> Toolchains menu.
You should now be able to build with either Swift 3.2 or 4.0 in Xcode 9.1 b2.
2 Comments
Cœur
Oh, correct... but then at the time of stable Xcode 9.1, custom toolchain won't be accepted by iTunes Connect for release.
Hung Truong
That's true. I suppose you could always continue to submit using Xcode 9.0 while testing on Xcode 9.1 beta. Sort of annoying that some of the iPhone X functionality is not working in the current Xcode though.
Using the last Xcode version solved this issue