Core Data stack

Overview

Core Data provides a set of classes that collaboratively support your app’s model layer:

• An instance of NSManagedObjectModel describes your app’s types, including their properties and relationships.

• An instance of NSManagedObjectContext tracks changes to instances of your app’s types.

• An instance of NSPersistentStoreCoordinator saves and fetches instances of your app’s types from stores.

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You use an NSPersistentContainer instance to set up the model, context, and store coordinator simultaneously.

Topics

Stack Setup

• NSPersistentContainer

Object Modeling

• NSManagedObjectModel
• NSEntityDescription
• NSPropertyDescription
• NSAttributeDescription
• NSDerivedAttributeDescription
• NSRelationshipDescription

Object Management

• NSManagedObjectContext
• NSManagedObject
• NSManagedObjectID

Store Coordination

• NSPersistentStoreCoordinator
• NSPersistentStore
• NSPersistentStoreDescription
• NSPersistentStoreRequest
• NSPersistentStoreResult
• NSPersistentStoreAsynchronousResult
• NSSaveChangesRequest
• NSAtomicStore
• NSAtomicStoreCacheNode
• NSIncrementalStore
• NSIncrementalStoreNode

See Also

Essentials

• Creating a Core Data model
• Setting up a Core Data stack
• Handling Different Data Types in Core Data
• Linking Data Between Two Core Data Stores