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<td width="20%">[[Joining the Apple iOS Developer Program|Previous]]<td align="center">[[iPhone iOS 5 Development Essentials|Table of Contents]]<td width="20%" align="right">[[Creating a Simple iPhone iOS 5 App|Next]]</td>
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<td width="20%">Joining the Apple iOS Developer Program<td align="center"><td width="20%" align="right">Creating a Simple iPhone iOS 5 App</td>
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<google>BUY_IOS5</google>
iPhone apps are developed using the iOS SDK in conjunction with Apple’s Xcode 4 development environment. The iOS SDK contains the development frameworks that were outlined in [[iPhone iOS 5 Architecture and SDK Frameworks]]. Xcode 4 is an integrated development environment (IDE) within which you will code, compile, test and debug your iOS iPhone applications. The Xcode 4 environment also includes a feature called Interface Builder which enables you to graphically design the user interface of your application using the components provided by the UIKit framework.
