Book Image

Core Data iOS Essentials

By : Bintu Harwani, B. M. Harwani
Book Image

Core Data iOS Essentials

By: Bintu Harwani, B. M. Harwani

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.
Table of Contents (19 chapters)
Core Data iOS Essentials
About the Author
About the Reviewers


Relationship is established between two or more entities to explain how they are mutually associated to each other. In fact, the relationships allow the managed object of a particular entity to maintain references to the managed objects of another entity (destinations). In Core Data, the relationships are defined in the same way as the attributes are defined. The relationships are assigned a name, that serves as the key value to set and retrieve the object(s) represented by the relationship.


The relationships are added to the entities in the Xcode's data model editor in the same way attributes are added.

Types of relationships

The relationship can be of three types:

  • One to one relationship

  • One to many relationship

  • Many to many relationship

One to one relationship

This relationship means a row in one entity will be associated with exactly one row in the destination entity. In other words, a managed object can contain a pointer to a single managed object of a specific entity. For...