Revert optimizations made on .png files for iOS and leave them on their corresponding directory (if all the png are in a single dir, use pngcrush -d instead).

uncrush.rb

require 'fileutils'
include FileUtils

$dir = ARGV.shift
if $dir.nil?
  puts "usage: #{$0} <dir>"
  exit 1
end

Dir.glob("#{$dir}/**/*.png").each do |path|
  tmp_path = path + '.tmp'
  out = `/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/pngcrush -revert-iphone-optimizations "#{path}" "#{tmp_path}" 2>&1`
  raise "error: #{out}" unless $?.success?

  mv(tmp_path, path)
end