iOS標準キーボードの登録単語をMac経由でATOK for iOSへインポートする ref: http://qiita.com/doraTeX/items/3d2bfd2622286c0aca72

plist2atok.rb

#!/usr/bin/ruby
require 'rexml/document'

dict = REXML::Document.new(open("ユーザ辞書.plist"))

open("user_word.txt","w:UTF-16LE"){|f|
  f.print "\uFEFF!!ATOK_TANGO_TEXT_HEADER_1\r\n\r\n"
  dict.elements.each('plist/array/dict') do |element|
    phrase   = element.elements[2].text
    shortcut = element.elements[4].text 
    f.print sprintf("%s\t%s\t名詞*\r\n", shortcut, phrase).encode(Encoding::UTF_16)
  end
}