Xcode 9 Swift Language Version SWIFT VERSION

Question

I ve recently updated xcode to version 9  Before that in Xcode 8 x whenever I use to do pod update it shows me an update code to convert the code to Swift 3 and doing that solve the errors  But now it is giving me this error      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    For this error I ve tried Build Settings  gt  Swift Language Version and it was Swift 3 2 But as the update call has re-installed some of the pods like Alamofire and it says to install Xcode 8 x to convert the code to Swift 3 so do I need to install an additional version with the latest Xcode  If yes  then how can I install Xcode 8 with Xcode 9

User · Answer

This can happen when you added Core Data to an existing project.
Check the:
<Name>/<Name>.xcdatamodeld/<Name>.xcdatamodel/contents
file.
This file contains an entry "sourceLanguage" that (by default) might have been set to "Swift". Change it to "Objective-C".

User · Answer

This Solution works when nothing else works   I spent more than a week to convert the whole project and came to a solution below   First  de-integrate the cocopods dependency from the project and then start converting the project to the latest swift version   Go to Project Directory in the Terminal and Type   pod deintegrate   This will de-integrate cocopods from the project and No traces of CocoaPods will be left in the project  But at the same time  it won t delete the xcworkspace and podfiles  It s ok if they are present   Now you have to open xcodeproj not xcworkspace  and you will get lots of errors because you have called cocoapods dependency methods in your main projects   So to remove those errors you have two options    Comment down all the code you have used from cocoapods library  Create a wrapper class which has dummy methods similar to cocopods library  and then call it    Once all the errors get removed you can convert the code to the latest swift version   Sometimes if you are getting weird errors then try cleaning derived data and try again

User · Answer

For Objective C Projects created using Xcode 8 and now opening in Xcode 9   it is showing the same error as mentioned in the question   To fix that  Press the   button in Build Settings and select Add User-Defined Setting as shown in the image below      Then in the new row created add SWIFT VERSION as key and 3 2 as value like below      It will fix the error for objective c projects

User · Answer

Answer to your question  You can download Xcode 8 x from Apple Download Portal or Download Xcode 8 3 3  or see  Where to download older version of Xcode   if you ve premium developer account  apple id   You can install  amp  work with both Xcode 9 and Xcode 8 x in single  mac  system   Make sure you ve Command Line Tools supporting both version of Xcode  to work with terminal  see  How to install  Command Line Tool       Hint  How to migrate your code Xcode 9 compatible Swift versions  Swift 3 2 or 4  Xcode 9 allows conversion migration from Swift 3 0 to Swift 3 2 4 0 only  So if current version of Swift language of your project is below 3 0 then you must migrate your code in Swift 3 compatible version Using Xcode 8 x    This is common error message that Xcode 9 shows if it identifies Swift language below 3 0  during migration     Swift 3 2 is supported by Xcode 9  amp  Xcode 8 both      Project    Select Your Project Target    Build Settings    Type  swift  in Searchbar  Swift Compiler Language   Swift Language Version   Click on Language list to open it      Convert your source code from Swift 2 0 to 3 2 using Xcode 8 and then continue with Xcode 9  Swift 3 2 or 4       For easier migration of your code  follow these steps   it will help you to convert into latest version of swift supported by your Xcode Tool      Xcode  Menus  Edit    Covert    To Current Swift Syntax

User · Answer

In my case  all warn disappeared after I directly changed swift version from 2 x to 4 0 in build settings except two warn    These warning related to myprojectnameTests and myprojectnameUITests folder  I didn t notice and I thought its relate to direct immigration from Xcode 7 to Xcode 9 and I thought I couldn t solve this problem and I should install missed Xcode 8 version    In my case  I deleted these folders and all warns disappeared  but you can recreate this folder and contains using this   file  gt  new  gt  target  gt   uitest or unittest extensions   and use this article for create test cases   https   developer apple com library content documentation DeveloperTools Conceptual testing with xcode chapters 04-writing tests html

User · Answer

I just got this after creating a new Objective-C project in  Xcode 10  after I added a Core Data model file to the project   I found two ways to fix this    The Easy Way  Open the Core Data model s File Inspector    -1  and change the language from Swift to Objective-C      Longer and more dangerous method   The model contains a  contents  file with this line    lt model type  com apple IDECoreDataModeler DataModel  documentVersion  1 0  lastSavedToolsVersion  14460 32  systemVersion  17G5019  minimumToolsVersion  Automatic  sourceLanguage  Swift  userDefinedModelVersionIdentifier    gt    In there is a sourceLanguage  Swift  entry  Change it to sourceLanguage  Objective-C  and the error goes away   To find the  contents  file  right click on the  xcdatamodeld in Xcode and do  Show in Finder   Right-click on the actual  Finder  file and do  Show Package Contents   Also  Changing the model s language will stop Xcode from generating managed object subclass files in Swift

User · Answer

maybe you need to download toolchain  This error occurs when you don t have right version of swift compiler

User · Answer

I just click on latest swift convert button and set App target build setting-  Swift language version  swift 4 0   Hope this will help

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