Value for Swift_Version Cannot Be Empty

Value for SWIFT_VERSION cannot be empty

Select your app target then goto build setting, search for swift set the swift language version from the dropdown.

How to fix SWIFT_VERSION error on PhoneGap Build

I use Cordova in my Ionic project and set the swift version in the following way. I hope this helps you as well.

By default, the Swift 4 support is added but the legacy version (2.3) can still be configured as a preference, inside the project's config.xml, within the <platform name="ios"> section:

<preference name="UseLegacySwiftLanguageVersion" value="true" />

Or it is possible to specify the version as following, inside the project's config.xml, within the <platform name="ios"> section:

<preference name="UseSwiftLanguageVersion" value="5" />

Your plugin is using this swift dependency, you can check this link for more info: https://www.npmjs.com/package/cordova-plugin-add-swift-support

Xcode 9 Swift Language Version (SWIFT_VERSION)

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 & 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'))

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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 & 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).

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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

The “Swift Language Version” (SWIFT_VERSION) build setting error with project in Objective C

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.

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.

“Swift Language Version” (SWIFT_VERSION) is required to be configured correctly for targets which use Swift

In the navigator selection bar, click the magnifying glass, then search for "SWIFT_VERSION" You will find the places in the project where you can adjust the swift version accordingly.

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