Unsupported swift version (SWIFT 5)

Question

before you mark this question as a duplicate, I checked this question

and it didn't work for me.

how to fix this error:

error: SWIFT_VERSION '5.0' is unsupported, supported versions are: 3.0, 4.0, 4.2. (in target 'DropDown')

First Update Xcode after that Change language version Target->build setting -> Swift compiler language -> select 5, 4.2 etc. it will Work. — Ravindra_Bhati, Apr 01 '19 at 09:59
I have many reasons, not to update Xcode to the new version, anyway I found an alternative solution, I updated my Podfile to downgrade the 'DropDown' Library. — MhmdRizk, Apr 04 '19 at 08:12

score 11 · Accepted Answer · answered Apr 12 '19 at 11:12

11

For XCode 10.1, select your Pods File

-> Go to Build Settings -> Choose your Pod -> Search "Swift" -> Navigate to "Swift Language version" -> Set to desired language version.

answered Apr 12 '19 at 11:12

Deepak Chaudhary

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What if his pod was updated to contain Swift 5 code? – Rakesha Shastri Apr 12 '19 at 12:59
@RakeshaShastri If pod is supporting prior language then it will help. Otherwise, Logically there are two options either find another pod or update your Xcode :D. – Deepak Chaudhary Apr 12 '19 at 13:09
Exactly. So you agree that your answer will not work for him. :) – Rakesha Shastri Apr 12 '19 at 13:10
how do you know, that which pod he is using has supported only swift 5. You must check the pod first. Particularly only, in this case, it will not work. I found a similar problem while using SwiftyJson in Xcode 10.1. I resolved it. – Deepak Chaudhary Apr 12 '19 at 13:13
i know because he says that in the question. – Rakesha Shastri Apr 12 '19 at 13:21
I think u must check this line in question as well "supported versions are: 3.0, 4.0, 4.2. (in target 'DropDown')" – Deepak Chaudhary Apr 12 '19 at 13:22
That line is not relevant. His pod contains code in Swift 5. What do you think Xcode that doesn't know Swift 5 will do? – Rakesha Shastri Apr 12 '19 at 13:56

score 7 · Answer 2 · answered Apr 01 '19 at 09:51

7

You have code which was compiled on the new Xcode 10.2 or the beta version which supports Swift 5. Update your Xcode to the latest version.

answered Apr 01 '19 at 09:51

Rakesha Shastri

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I have many reasons, not to update Xcode to the new version, anyway I found an alternative solution, I updated my Podfile to downgrade the 'DropDown' Library. – MhmdRizk Apr 04 '19 at 08:12
@MhmdRizk you are not supposed to have any. It is fine if you do not update to the beta versions, but definitely not recommended for the stable builds. – Rakesha Shastri Apr 04 '19 at 08:14
I work in many projects at the same time, and right now I don’t have the time to update the build settings for each project, but as soon as I have time to, I will. – MhmdRizk Apr 04 '19 at 08:16
@MhmdRizk You can do it, without updating your xcode. – Deepak Chaudhary Apr 12 '19 at 12:57
@DeepakChaudhary no he can't unless he downgrades his pod version. – Rakesha Shastri Apr 12 '19 at 12:59
@RakeshaShastri In his case, he can. – Deepak Chaudhary Apr 12 '19 at 13:26

score 0 · Answer 3 · answered May 18 '19 at 11:31

0

After upgrading to Xcode 10.2 release make sure you reboot MacOS. I had the exact same problem and reboot helped.

answered May 18 '19 at 11:31

Dan Korkelia

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score 0 · Answer 4 · answered Jul 08 '20 at 07:47

In addition to the correct answer, I added this to my podfile.

post_install do |installer|
  installer.pods_project.targets.each do |target|
    target.build_configurations.each do |config|
      config.build_settings['SWIFT_VERSION'] = '5.0'
      end
  end
end

Unsupported swift version (SWIFT 5)

4 Answers4