This is a static universal build of ICU 54.1.1 for armv7, armv7s, arm64, x86 64 and i386 suitable for using in iOS apps. The icu directory is taken from here.
I recommend putting this repo under a Vendor directory inside your project folder so it remains portable.
$ git submodule add git@github.com:zhm/icu-ios.git YourAppName/Vendor/icu-ios
$ cd YourAppName/Vendor/icu-ios
$ ./build.sh
Important : It seems it does not compile with the Command Line Tools of Xcode 6.1. -> Use the Xcode 5.1.1 command lines tools. (Xcode preferences, Locations, Command Line Tools)
Add all of the .a files from the build-universal directory to your project from the Link Binary With Libraries section under
the Build Phases tab in Xcode.
Under the Build Settings tab, add the path to the header files. Here are the header paths if you've placed this project inside a Vendor folder in your project:
$(SRCROOT)/YourAppName/Vendor/icu-ios/icu/source/i18n
$(SRCROOT)/YourAppName/Vendor/icu-ios/icu/source/common