Changes

iPhone apps are developed using the iPhone SDK in conjunction with Apple’s Xcode development environment. The iPhone SDK contains the development frameworks that were outlined in The iPhone OS Architecture and Frameworks. Xcode is an integrated development environment within which you will code, compile, test and debug your iPhone applications. The Xcode environment also includes a tool called ''Interface Builder'' that enables you to graphically design the user interface of your application using the components provided by the UIKit framework.