What you need for this book
The minimum requirement for this book is an Intel-based Macintosh computer running OS X El Capitan 10.11. We will be using Xcode 7.3, which is the Integrated Development Environment (IDE) that is used to create applications for iOS, watchOS, and tvOS. Almost all projects that you will create with the help of this book will work and run on the iOS Simulator. However, some projects will require an Apple Watch and an iPhone to work correctly.
You can download the latest version of Xcode from http://developer.apple.com/xcode/.