Auto increment build number of Xcode project

gistfile1.txt

#
# Paste this into a new "Run Script" Build Phase (as described here: http://stackoverflow.com/a/15483906/974381)
#
# Tip: drag-and-drop your new Run Script to run before the "Compile Sources" Phase!
#
# Source: http://stackoverflow.com/a/15483906/974381
#
# How to get version numbers in code?
#  NSString *buildString = infoDictionary[(NSString*)kCFBundleVersionKey];
#  NSString *versionString = infoDictionary[@"CFBundleShortVersionString"];
#

#!/bin/bash    
buildNumber=$(/usr/libexec/PlistBuddy -c "Print CFBundleVersion" "$INFOPLIST_FILE")
buildNumber=$(($buildNumber + 1))
/usr/libexec/PlistBuddy -c "Set :CFBundleVersion $buildNumber" "$INFOPLIST_FILE"