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This tutorial shows how to create a simple iPhone OS application. It is not intended to give complete coverage & 8230; This table describes the changes to Core Data Tutorial for iPhone OS. Notes. Date. Corrected links to sample applications. 2009-09-09 & 8230; Core Data is available on iPhone OS v3.0 and later. This document describes tools and techniques for

iPhone OS v3.0. You should read this document to learn how to use Core Data on iPhone, including: ? The fundamental design patterns and techniques that underlie Core Data ? The basics of using the Xcode data modeling tool ? How to create, update, and delete objects managed by Core Data, and how to commit changes to a data store

Core Data is not an entry-level technology. Before starting to use Core Data, you must understand the basics of iPhone application development, including: ? How to use Xcode and Interface Builder ? Fundamental design patterns such as model-view-controller and delegation ? How to use view controllers, navigation controllers, and table views None of these tools and techniques are explained in this tutorial, so that the content can focus on Core Data itself. Documents you should read to gain adequate experience include: ? Your First iPhone OS Application ? Xcode Workspace Guide ? Cocoa Fundamentals Guide ? View Controller Programming Guide for iPhone OS ? Table View Programming Guide for iPhone OS & 8230;. Create the Project The only steps in this chapter are to create the project itself and link against the Core Location framework. >> In Xcode, create a new project using the Window-Based Application template in the iPhone OS section. In the Options section, select the switch to use Core Data for storage. Call the project “Locations”.

It’s important that you call the project “Locations” so that you can copy and paste code required later in the

tutorial. >> Link the project against the Core Location framework. (Use the General pane of the Info window for the

application’s target.) Understanding a Core Data–Based Project Together with various other supporting files, the template provides you with: ? An application delegate class ? A MainWindow interface (.xib) file ? A Core Data model (.xcdatamodel) file—typically referred to as the managed object model The application also links against the Core Data framework. Of the resources, the first two should be familiar, although the details of the delegate class will be new. The model file is described later in “Managed Object and Model” (page 21). For now, examine the header file of the application delegate class. In addition to the standard window and view controller, it provides four other properties and a new method: @property (nonatomic, readonly) NSString *application Documents Directory; As its name implies, the application Documents Directory property simply returns the path to the application’s documents directory, which is where the file containing the application’s data will be located. Similarly, the save action method saves the application’s data to disk. Saving is discussed in greater detail throughout this document. The remaining properties provide access to what’s called the Core Data stack

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