Using same version number for multiple Xcode targets Info.plist

The following works with Xcode 12 and does not require User-Defined variables.

1. Select your project
2. Select Build Settings and find "Versioning"
3. Set "Marketing Version" to be your version
4. Set "Current Project Version" to be your build

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5. Next, select each of your targets
6. Delete/remove any version number and it will use the default "Marketing Version"
7. Delete/remove any build number and it will use the default "Current Project Version"
8. Do this for all of your targets

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Once you do this, you only need to update the "Marketing Version" and "Current Project Version" for the Project and all of your targets will be updated accordingly.

Add a new custom property to your project (Editor -> Add Build Setting -> Add User Defined Setting). Let's name it MY_VERSION and let's give it value 1.0.1.

Now go to the Info section of every target and set the version to ${MY_VERSION}.