Summary

In this hour, you explored the layers that make up the iOS: Cocoa Touch, Media, Core Services, and Core OS. You learned the structure of a basic application: what objects it uses and how iOS manages the application life cycle. We also reviewed the common classes that you’ll encounter as you begin to work with Cocoa, including data types and UI controls.

To give you the tools you need to find class and method references on your own, this hour introduced you to two features in Xcode. The first, the Xcode Documentation window, offers a browser-like interface to the complete iOS documentation. The second, Quick Help, finds help for the class or method you are working with, automatically, as you type. Ultimately, it will be these tools that help you dive deeper into the Apple development environment.