base_localization.rb

# Compile localized nibs
require "tmpdir"

xib_dir = "#{ENV["PROJECT_DIR"]}/.../ja.lproj"
str_dir = "#{ENV["PROJECT_DIR"]}/.../en.lproj"
out_dir = "#{ENV["BUILT_PRODUCTS_DIR"]}/.../en.lproj"

Dir.mktmpdir do |tmpdir|
    Dir.foreach xib_dir do |xib_name|
        if File.extname(xib_name) == ".xib"
            tmp_path = "#{tmpdir}/#{xib_name}"
            nib_path = "#{out_dir}/#{File.basename(xib_name, ".*")}.nib"
            str_path = "#{str_dir}/#{File.basename(xib_name, ".*")}.strings"
            if File.exists?(str_path)
                system("ibtool #{xib_dir}/#{xib_name} --write #{tmp_path} --strings-file #{str_path}")
                system("ibtool #{tmp_path} --compile #{nib_path}")

            else
                system("ibtool #{xib_dir}/#{xib_name} --compile #{nib_path}")
            end
        end
    end
end