Contents

About the Authors

About the Technical Reviewers

Acknowledgments

Introduction

 Chapter 1: Touring Core Data

What Is Core Data?

Core Data Components

Creating a New Core Data Project

Creating the Project

Touring the Core Data Components

Initializing the Core Data Components

Creating a Managed Object Model

Adding Some Objects

Viewing the Data

Adding Core Data to an Existing Project

Creating a Core Data-less Application

Adding the Core Data Framework

Adding a Managed Object Model

Adding and Initializing the Core Data Stack

Creating the Object Model

Adding Objects to PersistenceApp

Wrapping Up

 Chapter 2: Building Data Models

Designing Your Database

Relational Database Normalization

Building a Simple Model

Entities

Attribues

Key-Value Coding

Generating Classes

Relationships

Storing and Retrieving Data

Inserting New Managed Objects

Retrieving Managed Objects

Predicates

Fetched Properties

Notifications

Notification upon Creation

Notification upon Fetch

Notification upon Change

Registering an Observer

Receiving the Notifications

Conclusion

 Chapter 3: Advanced Querying

Building WordList

Creating the Application

Building the Data Model

Creating the User Interface

Loading and Analyzing the Word List

Getting a Count

Displaying the Statistics

Querying Relationships

Understanding Predicates and Expressions

Viewing Your SQL Queries

Creating Single-Value Expressions

Creating Collection Expressions

Comparing Expressions Using Different Predicate Types

Using Different Comparison Modifiers

Using Different Options

Adding It Up: Using Compound Predicates

Aggregating

Using Subqueries

Sorting

Summary

 Chapter 4: Attending to Data Quality

Seeding Data

Using the Seed Store

Updating Seeded Data in Subsequent Releases

Undoing and Redoing

Undo Groups

Limiting the Undo Stack

Disabling Undo Tracking

Adding Undo to BookStore

Experimenting with the Undo Groups

Dealing with Errors

Handling Core Data Operational Errors

Handling Validation Errors

Handling Validation Errors in BookStore

Implementing the Validation Error-Handling Routine

Summary

 Chapter 5: Integrating with the User Interface

Displaying Table Data with NSFetchedResultController

Creating a Fetched Results Controller

Creating the Fetched Results Controller Delegate

Storing Images

Adding Screenshots to CoreDump

Verifying the External Storage

Searching the Fetched Results in the Table

Adding the Search Controller

Retrieving the Search Results

Displaying the Search Results

Conclusion

 Chapter 6: Versioning and Migrating Data

Versioning

Lightweight Migrations

Migrating a Simple Change

Renaming Entities and Properties

Using a Mapping Model

Understanding Entity Mappings

Understanding Property Mappings

Creating a New Model Version That Requires a Mapping Model

Creating a Mapping Model

Migrating Data

Running Your Migration

Custom Migrations

Making Sure Migration Is Needed

Setting Up the Migration Manager

Running the Migration

Summary

 Chapter 7: Transforming and Encrypting Data

Using Transformable

Creating the Project and Adding Core Data

Creating Taps

Creating the View and Displaying the Taps

Hey, Wait a Minute! How Did My Color Transform?

Encrypting Data

Creating the Project and Setting Up the Core Data Model

Performing the Encryption and Decryption

Setting Up the Detail View to Edit a Note

Prompting For and Verifying the Password

An Alternative to Transformable: Data Protection

Summary

 Chapter 8: Talking to Services: iCloud and Dropbox

Integrating with iCloud

Using iCloud’s Ubiquity Container

Synching Content

Integrating with Dropbox Datastore API

Setting Up the API Access

Creating a Blank App to Use with Dropbox

Configuring the Callback URL

Linking to Dropbox Using the Datastore API

Creating and Synching Data with the Dropbox API

Using Core Data with the Dropbox Datastore API: ParcelKit

Adding the Required Frameworks for Dropbox and ParcelKit

Integrating DropboxEvents with Dropbox

Conclusion

 Chapter 9: Tuning Performance, Memory Usage, and Multithreading

Tuning Performance

Building the Application for Testing

Running Your First Test

Faulting

Prefetching

Caching

Expiring the Cache

Uniquing

Improve Performance with Better Predicates

Analyzing Performance

Dealing with Multiple Threads

Thread Safety

Oh Come On, What Could Possibly Go Wrong?

Gratuitous User Interface

Initializing the Stack on a Different Thread

Summary

Index