Note: This tutorial was built for Xcode 10 and iOS 12. Undo made easy Nobody's perfect. And once you implement UndoManager, your users don't have to be either. UndoManager provides a simple way to add undo/redo functionality to your apps. You may also be able to prevent the occasional flaw in your reasoning by keeping things more "local". In this tutorial, you'll build an app called People Keeper to improve your local reasoning with Swift value types and learn how to use that improved local reasoning to achieve flawless undo/redo implementations. Note: This tutorial assumes that you have an intermediate knowledge of iOS and Swift development. If you're new to iOS development and/or Swift, check out our "Learn to Code iOS Apps with Swift Tutorial" series first. Getting Started Download the materials for this tutorial using the Download Materials link found at the top and bottom of this page. Build and run the starter app: The app is pre-populated with some folks you've supposedly encountered and wanted to remember.


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