Minification of localized strings

Related tags

Localization SmallStrings
Overview

SmallStrings

Reducing localized .strings file sizes by 80%

How it works

The library consists of two main components:

  • A tool that converts the .strings files (of the form App.app/*.lproj/Localizable.strings) into a minified form as a build step. First, this tool eliminates key duplication by following the strategy from https://eisel.me/localization. This reduces the size by roughly 50%. Then, it keeps all these small files in a compressed form on disk, using LZFSE, reducing the size further. It also replaces the original language.lproj/Localizable.strings with placeholders that have one key-value pair each. This shows Apple that the same languages are still supported, so that it can pick the correct one based on the user's settings.
  • An iOS library that replaces NSLocalizedString with a new version, SSTStringForKey that fetches values for keys from this minified format.

Usage

Cocoapods

Add this to your Podfile:

pod 'SmallStrings'

Then add a Run Script build phase after the "Copy bundle resources" phase:

cd ${PODS_ROOT}/SmallStrings && ./localize.sh ${CODESIGNING_FOLDER_PATH} ${DERIVED_FILES_DIR}/SmallStrings.cache

Lastly, replace all usages of NSLocalizedString(key, comment) with SSTStringForKey(key).

Manual

Add Source/SSTSmallStrings.{h,m} to your project. Create a compress binary via clang -O3 compress.m -framework Foundation -lcompression -o compress and put the executable in the same directory as localize.{rb,sh}. Add a build step with cd /path/to/SmallStrings && ./localize.sh ${CODESIGNING_FOLDER_PATH} ${DERIVED_FILES_DIR}/SmallStrings.cache. Lastly, replace all usages of NSLocalizedString(key, comment) with SSTStringForKey(key).

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Comments
  • Upgrade to a more modern language - lol

    Upgrade to a more modern language - lol

    I challenge you to find whether translating to Swift brings a performance cost.

    Seriously, I appreciate your work on optimizing Apple stuff, but I thought I'd do this just for kicks. It's a (hopefully) zero-cost literal translation from Objective-C to Swift, which I have a ton of experience with. I didn't mess with the compiled executable or podspec file.

    Please tell me what you think about it!

    opened by philipturner 9
  • SPM Support

    SPM Support

    I wonder if you'd be up for considering support for Swift Package Manager support, with the ability to create it as a plugin allowing for it to be easily run from within Xcode or the CLI.

    opened by Sherlouk 0
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