architecture of an iPhone application. Design Patterns. If you haven’t already, you should make sure you read the design patterns chapter in … iPhone Application Tutorial Even though this is a very simple application, it introduces the fundamental design patterns, tools,
and techniques that underlie all iPhone development using Cocoa Touch…

Cocoa Touch comprises the UIKit and Foundation frameworks which provide the basic tools and infrastructure you need to
implement graphical, event-driven applications in iPhone OS. It also includes several other frameworks that provide key services for accessing device features, such as the user’s contacts. To learn more
about Cocoa Touch and where it fits into the iPhone OS, read iPhone OS Programming Guide. The main patterns you’re going to use are described in “Design Patterns” (page 10). In this tutorial, little regard is given to the user interface. Presentation is, however, a critical component of a successful iPhone application. You should read the iPhone Human Interface Guidelines and explore the sample code based on this tutorial (HelloWorldClassic) to understand how the user interface might be improved for a full-fledged application.
You’ll also start to gain an understanding of how view controllers work and how they fit into the architecture of an iPhone application

Adding a View Controller In this application you’ll need two classes. Xcode’s application template provided an application
delegate class and an instance is created in the nib file. You need to implement a view controller class and create an instance of it. Adding a View Controller Class View controller objects play a central role in most iPhone applications. As the name implies, they’re responsible for managing a view, but on iPhone they also help with navigation and memory management. You’re not going to use the latter features here, but it’s important to be aware of them for future development. UIKit provides a special class—UIViewController—that encapsulates most of the default behavior you want from a view controller. You have to create a subclass to customize the behavior for your application. >> In Xcode, in the project organizer select either the project (HelloWorld at the top of the Groups and Files list) or the Classes group folder—the new files will be added to the current selection. >> Choose File > New File and in the New File window. Select the Cocoa Touch Classes group, then select UIViewController subclass.

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