Until this point, we were concentrating almost exclusively on learning Swift without learning much about the platforms it was designed for. This is because learning a new platform is entirely different from learning a language. Learning a programming language is like learning the basic grammar of a spoken language. The grammar in spoken languages generally express similar concepts, but the specific words of the languages are often more varied, even if they are sometimes recognizable. Learning a programming language is about learning how to connect to the specific vocabulary of your desired platform. This chapter will be about learning some of the vocabulary of the iOS framework.

We will do this by going through the process of developing a simple camera app. Along the way, you will learn some of the most critical vocabulary to get started with any other kind of iOS app and many of the concepts will also be transferable to OS X development....