To Mark a version number，git commit hash and branch name on a image, it can be your App's icons.

markversion.sh

commit=`git rev-parse --short HEAD`
branch=`git rev-parse --abbrev-ref HEAD`
version=`/usr/libexec/PlistBuddy -c "Print CFBundleVersion" "${INFOPLIST_FILE}"`

function processIcon() {
    export PATH=$PATH:/usr/local/bin
    base_file=$1
    base_path=`find ${SRCROOT} -name $base_file`
    
    if [[ ! -f ${base_path} || -z ${base_path} ]]; then
    return;
    fi
    
    target_file=`echo $base_file | sed "s/_base//"`
    target_path="${CONFIGURATION_BUILD_DIR}/${UNLOCALIZED_RESOURCES_FOLDER_PATH}/${target_file}"
    
    if [ $CONFIGURATION = "Release" ]; then
    cp ${base_file} $target_path
    return
    fi
    
    width=`identify -format %w ${base_path}`
    
    convert -background '#0008' -fill white -gravity center -size ${width}x40\
    caption:"${version} ${branch} ${commit}"\
    ${base_path} +swap -gravity south -composite ${target_path}
}

processIcon "icon-114.png"
processIcon "icon-57.png"