Chapter 9: What Are Frameworks and How Do I Use Them?
You can use frameworks to add related objects from the iOS kit of parts to your app, such as video and audio features, map support, enhanced graphics, and so on. You can also use frameworks to include objects and other features created by other developers. iOS frameworks are easy to find and easy to add, but they aren’t always easy to use. Third-party frameworks are harder to find, but they often include a sample project that you can customize and copy into your own apps.