core-data

Core Data persistence starts with initializing NSPersistentContainer to load your data model, configure the store, and manage the object context. This establishes the stack needed for storing and retrieving app data across launches.

Yes, SwiftData integrates with Core Data by providing modern @Model and @Query syntax while sharing the same persistent store. This lets you combine SwiftData's declarative approach with Core Data's robust migration and background-context capabilities.

Fetch requests retrieve filtered data from your store using NSFetchRequest, while background contexts run writes on separate threads to keep the UI responsive. Both operations work through the NSPersistentContainer to maintain data consistency.

Core Data migrations map old schema versions to new ones using lightweight or custom migration strategies. NSPersistentContainer manages version detection and applies migrations automatically during store initialization.

Use background contexts to perform persistence operations off the main thread while your UI remains interactive. This pattern is essential for offline-first apps that sync when connectivity returns without blocking user interactions.

Yes, NSPersistentContainer supports in-memory stores for testing, letting you verify persistence logic without file I/O. This enables fast, isolated unit tests for your data layer.