The iPhone SDK provides the tools and resources needed to create native iPhone applications that appear as icons on the user's Home screen. Unlike a web application, which runs in Safari, a native application runs directly as a standalone executable on an iPhone OS-based device. Native applications have access to all the features that make the iPhone and iPod touch interesting, such as the accelerometers, location service, and Multi-Touch interface. They can also save data to the local file system and even communicate with other installed applications through custom URL schemes.
The application life cycle constitutes the sequence of events that occurs between the launch and termination of your application. In iPhone OS, the user launches your application by tapping its icon on the Home screen. Shortly after the tap occurs, the system displays some transitional graphics and proceeds to launch your application by calling its main function. From this point on, the bulk of the initialization work is handed over to UIKit, which loads the application's user interface and readies its event loop. During the event loop, UIKit coordinates the delivery of events to your custom objects and responds to commands issued by your application. When the user performs an action that would cause your application to quit, UIKit notifies your application and begins the termination process.
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