following pods are integrated into targets that do not have the same Swift version

Question

I am updating my project to Swift 3. When updating some of my cocoapods to swift 3, I receive the following message in terminal, after running pod install:

Answer 1

For CocoaPods App v.1.1.1 this problem was solved by setting Use legacy Swift Language Version to Unspecified in Build Settings section for all targets.

Probably it's an app bug - all targets had the same settings but CocoaPods app complaining only about one of them.

UPD: to be able to compile project I had to change it back from Unspecified to No

Answer 2

I just solved a recent issue when I updated my swift3 project to swift4 one with Xcode9, the problem said: [!] The following pods are integrated into targets that do not have the same Swift version:

Appsee required by MyApp (Swift 4.0), MyAppUnitTest (Swift 3.0) ...Allpods

My solution was: With my main target MyApp with the swift version at 4.0, I also updated my UnitTest version to 4.0 into Build Settings --> Swift Language Version

Answer 3

I have solved the problem like this:

1. I had two targets: the main project and the tests targets.
2. My main project's target had the 'Use legacy Swift Language version' (in Build Settings) to 'Unspecified (3.0)'.
3. I set the 'Use legacy Swift Language version' to 'No' and it worked fine.

Answer 4

This problem gets worse with Xcode 9 since it supports both 3.2 and 4.0 swift versions, but Cocoa Pods doesn't support this yet:

[!] The following pods are integrated into targets that do not have the same Swift version:
- XCGLogger required by target1 (Swift 4.0), target2 (Swift 3.0)

Workaround: switch target1 to swift 3.2 temporarily, install cocoa pods, then switch it back to swift 4.0.

Answer 5

I had the problem with one target with a difference from 3.0 to 3.0.1

I solved it by manually editing the project file (project.pbxproj) and change 3.0; with 3.0.1;

Answer 6

When I opened my xcodeproj file it displayed 3.2, but when I ran git diff, I noticed that the project.pbxproj had everything as Swift 3.0.

Manually updating the SWIFT_VERSION variables to 3.2 with a text editor solved the discrepancy.

I recommend this as a last resort only!