As a courtesy, this is a full free rendering of my book, Programming iOS 6, by Matt Neuburg. Copyright 2013 Matt Neuburg. Please note that this edition is outdated; the current books are iOS 10 Programming Fundamentals with Swift and Programming iOS 10. If my work has been of help to you, please consider purchasing one or both of them. Thank you!
In addition to the basic UIKit and Foundation frameworks, which supply the fundamental interface and utility classes for all apps, Cocoa supplies numerous optional frameworks that you can use if your app has special needs. This part of the book introduces some of these frameworks and their related topics. At the same time, it necessarily exercises some restraint. To explore all of the additional iOS frameworks in full depth would more than double the size of this book! So this part of the book fully explains the basics, but then stops and leaves you to go further on your own if you need to; it teaches you what you need to know to get started, and it trains you to understand and explore these and related frameworks independently if your app requires a further level of depth and detail.