Xcode Auto-increment Build & Version Numbers

xcode-build-bump.sh

# xcode-build-bump.sh
# @desc Auto-increment the build number every time the project is run. 
# @usage
# 1. Select: your Target in Xcode
# 2. Select: Build Phases Tab
# 3. Select: Add Build Phase -> Add Run Script
# 4. Paste code below in to new "Run Script" section
# 5. Drag the "Run Script" below "Link Binaries With Libraries"
# 6. Insure that your starting build number is set to a whole integer and not a float (e.g. 1, not 1.0)

buildNumber=$(/usr/libexec/PlistBuddy -c "Print CFBundleVersion" "${PROJECT_DIR}/${INFOPLIST_FILE}")
buildNumber=$(($buildNumber + 1))
/usr/libexec/PlistBuddy -c "Set :CFBundleVersion $buildNumber" "${PROJECT_DIR}/${INFOPLIST_FILE}"

xcode-version-bump.sh

# xcode-version-bump.sh
# @desc Auto-increment the version number (only) when a project is archived for export. 
# @usage
# 1. Select: your Target in Xcode
# 2. Select: Build Phases Tab
# 3. Select: Add Build Phase -> Add Run Script
# 4. Paste code below in to new "Run Script" section
# 5. Check the checkbox "Run script only when installing"
# 6. Drag the "Run Script" below "Link Binaries With Libraries"
# 7. Insure your starting version number is in SemVer format (e.g. 1.0.0)

# This splits a two-decimal version string, such as "0.45.123", allowing us to increment the third position.
VERSIONNUM=$(/usr/libexec/PlistBuddy -c "Print CFBundleShortVersionString" "${PROJECT_DIR}/${INFOPLIST_FILE}")
NEWSUBVERSION=`echo $VERSIONNUM | awk -F "." '{print $3}'`
NEWSUBVERSION=$(($NEWSUBVERSION + 1))
NEWVERSIONSTRING=`echo $VERSIONNUM | awk -F "." '{print $1 "." $2 ".'$NEWSUBVERSION'" }'`
/usr/libexec/PlistBuddy -c "Set :CFBundleShortVersionString $NEWVERSIONSTRING" "${PROJECT_DIR}/${INFOPLIST_FILE}"

For us, the script don't update the build number but by changing the script the build number change (code for xcode 10):

buildNumber=$(/usr/libexec/PlistBuddy -c "Print CFBundleVersion" "$PRODUCT_SETTINGS_PATH")
buildNumber=$(cut -d'.' -f2 <<<$buildNumber)
buildNumber=$(date +"%y%m%d")"."$(($buildNumber + 1))
/usr/libexec/PlistBuddy -c "Set :CFBundleVersion $buildNumber" "$PRODUCT_SETTINGS_PATH"
#180925.1008 First is the current date and after the dot the build number

Thanks @jndefosse, I use the commit count as the build number.

buildNumber=$(git rev-list --count HEAD)
/usr/libexec/PlistBuddy -c "Set :CFBundleVersion $buildNumber" "$PRODUCT_SETTINGS_PATH"

I needed to compare buildNumber with the current value in the plist before updating the plist. If the plist is updated on every build, then the SwiftUI previewer will continually stop:

currentNumber=$(/usr/libexec/PlistBuddy -c "Print :CFBundleVersion" "$PRODUCT_SETTINGS_PATH")
if [ "$buildNumber" -ne "$currentNumber" ] ; then
  /usr/libexec/PlistBuddy -c "Set :CFBundleVersion $buildNumber" "$PRODUCT_SETTINGS_PATH"
fi

From Xcode 13, a new project will not generate an info.plist. Instead this is embedded in the project.

If you want a project to generate an Info.plist, set Generate Info.plist file to no and then open the Info tab and add a option (e.g. App Transport Security Settings). Xcode will then generate the Info.plist file and add all the values as well as update the build settings.

If you want to keep $(MARKETING_VERSION)
in Info.plist for CFBundleShortVersionString but
want to increase version after successful archive or build
then use following script
following script will increase like 1.0 to 2.0
but of-course that logic can be modified using above explained gist etc

Script to increase app version

Shows this error after setup