Ios – Module compiled with Swift 4.2.1 cannot be imported by the Swift 5.0 compiler

iospaytmswift

I am trying to implement integration of third party app into project as per instruciton https://github.com/Paytm-Payments/Paytm_iOS_App_Kit/tree/master/Swift/BitCodeDisabled/PaytmNativeSDK

I see the following error in build

Module compiled with Swift 4.2.1 cannot be imported by the Swift 5.0
compiler

I have tried toolchains https://medium.com/xcblog/switching-swift-versions-inside-xcode-using-toolchains-755b28831c43
The error changes to Reason: Incompatible library version: PaytmNativeSDK requires version 1.0.0 or later, but libswiftCore.dylib provides version 0.0.0

How do i setup XCode or the Library to make it work . There is no chance of the vendor updating the library for Swift 5.0 and make it available on POD.

Best Answer

For Carthage users: After upgrading to Xcode 10.2, I ran into this same issue with a framework that I had been importing using Carthage.

I resolved it by rebuilding the framework:

carthage update --no-use-binaries --platform iOS

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Ios – Module compiled with Swift 3.0 cannot be imported in Swift 2.3

You'll need to change the Use Legacy Swift Language Version to NO - this makes sure your project will use swift 3.

If you want to package your project as a POD (for cocoapods) you'll need to add a file named .swift-version (containing 1 single line, "3.0"). This will tell cocoapods to use the swift 3 compiler.

Everything should work after this changes.

Ios – Module compiled with Swift 5.1 cannot be imported by the Swift 5.1.2 compiler

OK, Turns out if you watch the WWDC video, they explain it: https://developer.apple.com/videos/play/wwdc2019/416/

You need to set the Build Settings > Build Options > Build Libraries for Distribution option to Yes in your framework's build settings, otherwise the swift compiler doesn't generate the neccessary .swiftinterface files which are the key to future compilers being able to load your old library.

This ends up in your project.pbxproj file as:

BUILD_LIBRARY_FOR_DISTRIBUTION = YES;

After setting this flag, a framework I compiled using Xcode 11.0 (swift 5.1) was able to be used by Xcode 11.2 (swift 5.1.2) and everything appears to be working correctly.

Hopefully this question/answer will serve as a useful reference for everyone who hasn't watched all the WWDC videos

If the error still persists go to Product > Clean Build Folder and Build again.

Best Answer

Related Solutions

Ios – Module compiled with Swift 3.0 cannot be imported in Swift 2.3

Ios – Module compiled with Swift 5.1 cannot be imported by the Swift 5.1.2 compiler

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