Preface
Welcome to Learning Swift! This book will help you put the Swift
programming language into practice by walking you through the
development of a complete application for iOS that features a wide array of
features, including camera access, working with the filesystem, face
detection, and the iOS graphics system. Along the way, we’ll also introduce
you to new and advanced topics in the Swift programming language.
Swift is a pretty amazing modern language, taking the best from other newer
languages without reinventing the wheel. Swift is easy to write, easy to read,
and hard to make big mistakes in.
Our philosophy is that the best way to learn Swift is to build apps using it! To
build apps, though, you need a great framework, and Apple has one of the
best ones for building high-quality, featureful software: Cocoa Touch. This
book could quite easily be titled Learning Cocoa Touch with Swift, or
something similar, because the frameworks are just as important as the
language itself. At the time of writing, Swift is currently at version 4, and has
a bright future ahead of it.
Resources Used in This Book
We recommend following along with the book by writing code yourself as
you progress through each chapter. If you get stuck, or just want to archive a
copy of the code, you can find what you need via our website.
Audience and Approach
This book is solely focused on Swift 4 and does not cover the use of
Objective-C. We might mention it occasionally, but we don’t expect you to
know how to use it. We first cover the basics of the Swift 4 language, and
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