iOS Models: Core Data

Boska Lee

Agenda

• Core Data Features

• Core Data Architecture

• Magical Record

Core Data

• Part of Cocoa API in Mac OSX

• From OSX 10.4 and iOS 3.0

• like Core Audio, Core Location ….etc.

Core Data Features• change tracking and undo support

• lazy loading

• automatic validation of property values

• migration

• ui integration

• KVC,KVO

Core Data Architecture

1. Managed Object Model

2. Managed Object Context

3. Persistent Store Coordinator

4. Managed Object

Database vs Core Data

Table Schema NSEntityDescription

Table Record NSMangedObject

Database Access NSPersistentStoreCoordinator

Database Transaction NSManagedObjectContext

Magical Record!

• Wrapper libraries provide some much needed syntactic sugar and convenience methods to Core Data's verbose and complicated APIs.

• Inspired by Active Record

• DRY

EZTABLE schema

Demo