A script that automatically updates the version number when a build is performed. It sets $(CURRENT_PROJECT_VERSION) and $(MARKETING_VERSION).
The two files (Config.xcconfig and version.sh) should be dropped in $SRCROOT/$PROJECT_NAME.
The build might not work if ENABLE_USER_SCRIPT_SANDBOXING is set to YES in Build Settings -> Build Options Set this value to NO.
In Build Phases -> Run Script, add the following to the text box under Shell:
cd "$SRCROOT/$PRODUCT_NAME"
source version.sh
Note: Script is from an article at https://medium.com/@mateuszsiatrak/automating-build-number-increments-in-xcode-with-custom-format-a-practical-guide-bcc90a19f716