Want to create your first iPhone application? We are here to help you. This tutorial shows how to create simple iPhone application. We are not giving full coverage of all the features available, but rather to introduce some of the technologies and give you the fundamentals of the development process.

This document can be of your use, if you are just planning to create your very first iPhone application, or you are a student trying to learn things yourself. You can use this document to get started even if you intend to develop application for the iPad.

We are expecting that, you already have some awareness with the basics of computer programming in general and the Objective-C language in particular. If you haven’t used Objective-C before, you should first try to understand Objective-C and learn a bit before you continue here.

Our aim is to illustrate iPhone Application Development and not to create a finely polished application

We are going to understand how to create and manage a project using Xcode?

Fundamental design patterns and techniques that underlie all iPhone OS development

The basics of using Interface Builder

How to make your application respond to user input using standard user interface controls

Another aim of this document is to point out documents that you must also read to fully understand the iPhone OS development tools and techniques.

You should have installed the iPhone SDK and developer tools available from the iPhone Dev Center. This document describes the tools that are available for iPhone SDK v3.2 – check that your version of Xcode is at least 3.2.2.

Overview

We are going to create first simple iPhone application. It has a text field, a label, and a button. You can type your name into the text field and press the button to say hello. And your iPhone application updates the label’s text to say “Hello, <Name>!”

Even though this is a very simple iPhone application, it introduces the basic design patterns, tools, and techniques that underlie all iPhone OS 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. In this document, little regard is given to the user interface. However presentation is a critical component of a successful iPhone OS application.

Design Patterns

You should make sure you read the design patterns chapter in Cocoa Fundamentals Guide; however the main patterns you’re going to use are:

Delegation

Model View Controller

Target-Action

Quick summary of these patterns and an indication of where they’ll be used in the application

Delegation

Delegation is a pattern where one object periodically sends messages to another object specified as its delegate to ask for input or to notify the delegate that an event is occurring. You use it as an alternative to class inheritance for extending the functionality of reusable objects.

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www.peachpit.com – Live from Macworld Conference & Expo, 2009, Terry White, author of ‘The iPhone Book,’ reveals which iPhone applications he can’t live without including one he thinks is even better than Apple’s own version.

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