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Jun 10, 2020

Wikipedia iOS

The official Wikipedia iOS app.

MIT license

Building and Running

In the directory, run ./scripts/setup. Note: going to scripts directory and running setup will not work due to relative paths.

Running scripts/setup will setup your computer to build and run the app. The script assumes you have Xcode installed already. It will install homebrew, Carthage, and ClangFormat. It will also create a pre-commit hook that uses ClangFormat for linting.

After running scripts/setup, you should be able to open Wikipedia.xcodeproj and run the app on the iOS Simulator (using the Wikipedia scheme and target). If you encounter any issues, please don't hesitate to let us know via a bug report or messaging us on IRC in #wikimedia-mobile on Freenode.

Required dependencies

If you'd rather install the development prerequisites yourself without our script:

  • Xcode - The easiest way to get Xcode is from the App Store, but you can also download it from if you have an AppleID registered with an Apple Developer account.
  • Carthage - We check in prebuilt dependencies to simplify the initial build and run experience but you'll still need Carthage installed to allow Xcode to properly copy the frameworks into the built app. After you add, remove, or upgrade a dependency, you should run scripts/carthage_update to update the built dependencies.
  • ClangFormat - We use this for linting


Covered in the contributing document.

Development Guidelines

These are general guidelines rather than hard rules.




We use Xcode's default 4 space indentation and our .clang-format file with the pre-commit hook setup by scripts/setup. Currently, this does not enforce Swift formatting.

Process and code review norms

Covered in the process document.


The Wikipedia scheme is configured to execute the project's iOS unit tests, which can be run using the Cmd+U hotkey or the Product->Test menu bar action. Screenshot tests will fail unless you are running on one of the configurations defined by configurations_to_test_on_pull in fastlane/Fastfile.



Points to production servers.


Points to the Apps team's staging environment for page content and production for everything else. Has additional debugging menus and is pushed to TestFlight as a separate app bundle.

Local Page Content Service and Announcements

Points to the mobileapps and wikifeeds repos running locally.

MediaWiki Beta Cluster

Points to the MediaWiki beta cluster for MediaWiki API calls and production for everything else.


Launches the app in an RTL locale using the -AppleLocale argument.


For one off builds, can point to whatever is needed for the given experiment.

User Testing

For user testing. Has an alternate configuration so that it can be delivered ad hoc.

Event Logging Dev Debug

For testing the events that the app sends to Event Logging. Points to the Event Logging staging environment.

Beta Cluster tests

Tests that run against the MediaWiki beta cluster, checking for upstream changes to MediaWiki that might break any assumptions we have.


Runs automated screenshot tests.


Bundles up the app logic shared between the main app and the extensions (widgets, notifications).


Covered in the localization document.

{{name}}Widget, {{name}}Notification, {{name}}Stickers

Extensions for widgets, notifications, and stickers.


Generates the CodeMirror configuration files. CodeMirror is used in the section editor.

Continuous integration

Covered in the ci document.

Event logging

Covered in the event logging document.

Web development

The article view and several other components of the app rely on web components. Instructions for working on these components is covered in the web development document.

Contact us

If you have any questions or comments, you can join the #wikimedia-mobile channel on the Freenode IRC server. We'll also gladly accept any bug reports.

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