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Table Of Contents

Core Data iOS Essentials

2.8 (4)

Core Data iOS Essentials

2.8 (4)

Overview of this book

Core Data is the essential ingredient in data driven iOS apps. It's used for storing, retrieving, and manipulating application data in databases, XML, and binary formats. It's an essential component for iPhone, iPod Touch, and iPad apps.Core Data Essentials provides a clear, readable guide to the most useful aspects of Core Data. Built around a realistic example app, the book showcases the most important aspects of Core Data development in the context of a complete, functioning app written in Objective C.The book starts with a tour of how the app works. Then you'll see how to easily display data using the Table View. You'll learn how to develop an appropriate data model that fits the needs of your app, then implement that model as updatable data objects. You'll see how to update data and build relationships between objects and learn how Core Data can work with search, and how to provide your users with friendly data editing features.

Core Data iOS Essentials

Core Data iOS Essentials

Credits

Credits

About the Author

About the Author

Acknowledgement

Acknowledgement

About the Reviewers

About the Reviewers

www.PacktPub.com

www.PacktPub.com

Preface

Preface

Free Chapter

Overview

Overview

Prerequisite

A brief history

Source code

Shall we begin?

Understanding Core Data

Understanding Core Data

Core Data

Data Model

Model View Controller (MVC)

Core Data API

Overview of the application: Sales Record System for a Departmental Store

Entity Relationship Diagram

An application output sample

Automatic Master Product Update

Summary

Understanding Objective-C Protocol and Table View

Understanding Objective-C Protocol and Table View

Protocol

Creating a sample application using a protocol and a delegate

Introduction to Table View

Creating an application to display Table View cells

Adding names to the Table View

Summary

Designing a Data Model and Building Data Objects for Customers

Designing a Data Model and Building Data Objects for Customers

Creating a new project

Designing the data model

Building data objects for the Customer entity

Understanding code of autogenerated files

Summary

Creating, Listing, and Deleting Names of Customers

Creating, Listing, and Deleting Names of Customers

Splitting the task into two modules

Creating a module to save and delete a customer's name

Key value coding (KVC)

Implementing the methods of the NSFetchedResultsControllerDelegate protocol

Running the project

Summary

Creating, Listing, Displaying, and Deleting Records of Customers

Creating, Listing, Displaying, and Deleting Records of Customers

Understanding multiple managed object context

Applying the concept of multiple managed object context in our application

Enhancing our application to save, list, display, and delete customer information

viewDidLoad method

cell AtIndexPath method

didSelectRowAtIndexPath method

addCustomer method

addcustomerController method

Summary

Updating and Searching Records of Customers

Updating and Searching Records of Customers

Applying the update feature

Using KVO to know what has been updated

Running the project

Applying search facility

Understanding NSPredicate

Removing the keyboard after selecting a customer's name

Using Predicate Builder for creating a search criterion

Summary

Entering, Saving, Listing, and Deleting the Records of the Products Sold to the Customers

Entering, Saving, Listing, and Deleting the Records of the Products Sold to the Customers

Adding the product entity to the Data Model

Relationship

Establishing a relationship between the Customer and the Product entities

Building the data object for the Customer and the Product entities

Entering the information of the products sold to the customers

Creating a module to develop an interface to enter the product information

Developing a module to create a menu for manipulating the product information

Creating a module to connect the Product's menu to the rest of the project

Running the project

Summary

Entering, Displaying, and Deleting the Stock

Entering, Displaying, and Deleting the Stock

Adding the MasterProduct entity to the Data Model

Storing the image of the MasterProduct

Building the data object for the MasterProduct entity

Maintaining the MasterProduct information

Summary

Editing the Stock Information

Editing the Stock Information

Module to connect the MasterProduct's menu to the rest of the project

Running the application

Module to modify the information of the master product

Summary

Displaying the Products for Sale and Updating the Stock

Displaying the Products for Sale and Updating the Stock

Displaying the products available for sale

Updating the stock

Automatically updating the quantity of the product in the MasterProduct entity

Versioning

Migrations

Summary

Appendix

Appendix

Using KVO to know what has been updated

Key Value Observing (KVO) is the sister API to KVC and is used to inform us if a particular attribute of an object is changed. Consequently, we can take necessary action on getting notification of the change(s) that took place on any attribute of the object. To get the notification, we have to register our controller class (referred to as self) as an observer of the object for the keypath, where keypath is the name of the attribute of the object that we want to observe.

To register the observer, we use -addObserver:forKeyPath:options:context: method and to remove the observers, we use -removeObserver: forKeyPath: method.

Let us have a look at the syntax of the method that registers an observer:

[object addObserver:self
forKeyPath:@"attribute"
options:0
context:NULL];

Here, object is the name of object whose keypath (attribute) we want to observe. In order to observe the name attribute of the cust object (of the Customer class), we may add an observer...

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