Diffable Data Source
Diffable Data Source is a modern approach in iOS and macOS development for managing and updating collection views (like UITableView or UICollectionView) by automatically calculating differences between data snapshots. It uses the NSDiffableDataSourceSnapshot class to represent the current state of data and applies incremental updates to the UI without manual index path calculations. This simplifies data-driven UI updates, improves performance, and reduces bugs related to data synchronization.
Developers should learn Diffable Data Source when building iOS/macOS apps with complex, dynamic data in tables or collections, as it eliminates the need for error-prone manual updates like reloadData() or performBatchUpdates(). It's particularly useful for apps with real-time data changes, such as chat applications, social media feeds, or any UI that frequently updates based on backend data. This concept enhances maintainability and ensures smoother animations during data transitions.