Xcode 4 Cookbook by Steven F. Daniel

This is a Cookbook with easy-to-follow recipes containing practical and detailed examples which are all fully backed up with code, illustrations, and tips. If you ever wanted to build applications that integrate Facebook, iCloud, Core Location, and the Core Motion frameworks into your own applications then this book is for you. You should have a good knowledge and programming experience with Objective-C and have used Xcode 4 and iOS 5.