Book Image

Mastering iOS 12 Programming - Third Edition

By : Donny Wals
Book Image

Mastering iOS 12 Programming - Third Edition

By: Donny Wals

Overview of this book

The iOS development environment has significantly matured, and with Apple users spending more money in the App Store, there are plenty of development opportunities for professional iOS developers. However, the journey to mastering iOS development and the new features of iOS 12 is not straightforward. This book will help you make that transition smoothly and easily. With the help of Swift 4.2, you’ll not only learn how to program for iOS 12, but also how to write efficient, readable, and maintainable Swift code that maintains industry best practices. Mastering iOS 12 Programming will help you build real-world applications and reflect the real-world development flow. You will also find a mix of thorough background information and practical examples, teaching you how to start implementing your newly gained knowledge. By the end of this book, you will have got to grips with building iOS applications that harness advanced techniques and make best use of the latest and greatest features available in iOS 12.
Table of Contents (35 chapters)
Title Page
Copyright and Credits
Dedication
Packt Upsell
Contributors
Preface
Index

Knowing what types are available


To write great code, you need to learn what tools are available in your toolbox. This applies to building apps and understanding the features UIKit has to offer, but it also applies to the language you use to write software in. Different languages come with various features, best practices, pros, and cons. The deeper your understanding of the language you work with, the better the decisions you can make about the code you write. As mentioned before, Swift's type system is one of the features that makes Swift such an excellent language for both experts and beginners to develop in.

 

Before you dive into the details of Swift's types and how they compare to each other, it's essential that you know what types Swift has to offer you. On a high level, you can argue that Swift has two types:

  • Reference types
  • Value types

Let's have a closer look at each type to see what they mean, how they work, and how you can use them.

Reference types

The types you have seen so far in...