Trevor Whittingham • 2/11/2025

Track SwiftData Changes With History

This article explains how to use SwiftData's history feature (available on iOS 18, macOS 15, and later) to track changes made to a persistent store across app sessions, widgets, or background syncs. It covers key concepts like history transactions, tokens, and changes (insert/update/delete), and provides practical examples using a task app model. The guide shows how to set author metadata, fetch transactions after a saved token, and avoid processing your own changes. This is useful for implementing badges, syncing, or detecting external modifications without manual diffing.

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#Maco #Io #Swiftdata