Swift game development : learn iOS 12 game development using SpriteKit, SceneKit and ARKit 2.0

434 Pages·2018·8.739 MB·English

by  Siddharth Shekar, Stephen Haney

Swift Game Development
Third Edition
Learn iOS 12 game development using SpriteKit,
SceneKit and ARKit 2.0
Siddharth Shekar
Stephen Haney
BIRMINGHAM - MUMBAI
Swift Game Development
Third Edition
Copyright © 2018 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval
system, or transmitted in any form or by any means, without the prior written
permission of the publisher, except in the case of brief quotations embedded in
critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the accuracy
of the information presented. However, the information contained in this book is
sold without warranty, either express or implied. Neither the authors, nor Packt
Publishing or its dealers and distributors, will be held liable for any damages caused
or alleged to have been caused directly or indirectly by this book.
Packt Publishing has endeavored to provide trademark information about all of the
companies and products mentioned in this book by the appropriate use of capitals.
However, Packt Publishing cannot guarantee the accuracy of this information.
Commissioning Editor: Ashwin Nair
Acquisition Editor: Reshma Raman
Content Development Editors: Flavian Vaz
Technical Editor: Akhil Nair
Copy Editor: Safis Editing
Project Coordinator: Sheejal Shah
Proofreader: Safis Editing
Indexers: Tejal Daruwale Soni
Graphics: Jason Monteiro
Production Coordinator: Shantanu Zagade
First published: July 2015
Second published: February 2017
Third edition: September 2018
Production reference: 1260918
Published by Packt Publishing Ltd.
Livery Place
35 Livery Street
Birmingham B3 2PB, UK.
ISBN 978-1-78847-115-2
www.packtpub.com
mapt.io
Mapt is an online digital library that gives you full access to over 5,000 books and
videos, as well as industry leading tools to help you plan your personal development
and advance your career. For more information, please visit our website.
Why subscribe?
• Spend less time learning and more time coding with practical eBooks and
Videos from over 4,000 industry professionals
• Learn better with Skill Plans built especially for you
• Get a free eBook or video every month
• Mapt is fully searchable
• Copy and paste, print, and bookmark content
Packt.com
Did you know that Packt offers eBook versions of every book published,
with PDF and ePub files available? You can upgrade to the eBook version at
www.Packt.com and as a print book customer, you are entitled to a discount on the
eBook copy. Get in touch with us at [email protected] for more details.
At www.Packt.com, you can also read a collection of free technical articles, sign up
for a range of free newsletters, and receive exclusive discounts and offers on Packt
books and eBooks.
Contributors
About the authors
Siddharth Shekar is a game developer and teacher with over 5 years of industry
experience and 12 years of experience in C++ and other programming languages, and
is adept at graphics libraries such as OpenGL and Vulkan and game engines such as
Unity and Unreal. He has also published games on the iOS and Android App Stores.
Siddharth has also authored 4 books, including Mastering Android Game Development
with Unity and Learning iOS 8 Game Development Using Swift, all published by
Packt Publishing
He currently lives in New Zealand and is a lecturer in the Games Department at
Media Design School. He teaches graphics programming and PlayStation 4 native
game development, and mentors final year production students.
I would like to thank my parents for supporting me in everything
that I choose to do. I would also like to thank Media Design School
for encouraging me to continue working on this book. Finally, I
would like to thank Packt Publishing for putting this book together
and offering me the opportunity to write the book.
Stephen Haney has written two books on iOS game development. He began his
programming journey at the age of 8 years on a dusty, ancient laptop using BASIC.
He has been fascinated with building software and games ever since. Now well
versed in multiple languages, he enjoys programming as a creative outlet the most.
He believes that indie game development is an art form—an amazing combination
of visual, auditory, and psychological challenges—rewarding to both the player and
the creator.
He enjoyed writing this book and sincerely hopes that it directly furthers your career
or hobby.
About the reviewer
Rafał Sroka is a Software Engineer with extensive expertise in iOS development,
building-up mobile apps, QA and release process, API design, and complex software
projects. He has worked on various high-value projects in Poland, Germany, and
Switzerland. He prefers working in cross-functional start-up environments where
fast delivery of well-written and tested code is crucial. He holds a Master's degree in
Electronics and Telecommunications. In his free time, he's a dedicated rock climber
and mountaineer. He is a doer.
Packt is Searching for Authors Like You
If you're interested in becoming an author for Packt, please visit authors.packtpub.
com and apply today. We have worked with thousands of developers and tech
professionals, just like you, to help them share their insight with the global tech
community. You can make a general application, apply for a specific hot topic that
we are recruiting an author for, or submit your own idea.

Table of Contents
Preface ix
Chapter 1: Designing Games with Swift 1
Why you will love Swift 2
Prerequisites 3
What you will learn in this book 3
Embracing SpriteKit 4
Reacting to player input 4
Structuring your game code 5
Building UI/menus/levels 5
Integrating with Game Center 5
Maximizing fun 5
Crossing the finish line 5
Monetizing your work 6
New in Swift 4.2 6
Setting up your development environment 7
Introducing and installing Xcode 7
Creating our first Swift game 8
Navigating our project 13
Exploring the SpriteKit demo 13
Examining the demo code 16
Cleaning up 16
Summary 17
Chapter 2: Sprites, Camera, Action! 19
Preparing your project 20
Drawing your first sprite 23
Building a SKSpriteNode class 23
[ i ]
Table of Contents
Animation—movement, scaling, and rotation 25
Sequencing multiple animations 26
Recapping your first sprite 26
The story on positioning 27
Alignment with anchor points 27
Working with textures 29
Downloading the free assets 29
More exceptional art assets 29
Drawing your first textured sprite 29
Adding the bee image to your project 30
Loading images with SKSpriteNode 30
Designing for Retina 31
The ideal asset approach 32
Hands-on with retina in SpriteKit 32
Organizing art into texture atlases 33
Exploring Assets.xcassets 33
Collecting art into texture atlases 34
Updating our bee node to use the texture atlas 35
Iterating through texture atlas frames 35
Putting it all together 37
Centering the camera on a sprite 37
Summary 41
Chapter 3: Mix in the Physics 43
Laying the foundations 43
Adopting a protocol for consistency 44
Organizing game objects into classes 44
The icy tundra 46
Adding the player's character 50
Renovating the GameScene class 54
Physics bodies and gravity 55
Dropping like flies 55
Solidifying the ground 56
Exploring physics simulation mechanics 57
Bumping bees into bees 60
Movement with impulses and forces 61
Summary 62
Chapter 4: Adding Controls 63
Retrofitting the Player class for flight 64
The Beekeeper 64
Updating the Player class 64
[ ii ]
Table of Contents
Moving the ground 64
Assigning a physics body to the player 65
Creating a physics body shape from a texture 65
Polling for device movement with Core Motion 66
Implementing the Core Motion code 66
Wiring up the sprite onTap events 68
Implementing touchesBegan in the GameScene 68
Larger than life 69
Teaching our penguin to fly 70
Listening for touches in GameScene 71
Fine-tuning gravity 72
Spreading your wings 72
Improving the camera 73
Pushing Pierre forward 76
Tracking the player's progress 77
Looping the ground as player the moves forward 77
Summary 79
Chapter 5: Spawning Enemies, Coins, and Power-Ups 81
Introducing the cast 82
Locating and adding the art assets 82
Adding the Power-up Star 84
Adding the Star class 84
A new enemy - the Mad Fly 86
Adding the MadFly class 86
Another terror - Bats! 87
Adding the Bat class 87
Guarding the ground with the Blade 88
Adding the Blade class 89
Adding coins 90
Creating the coin classes 90
Organizing the project navigator 91
Testing the new game objects 92
Preparing for endless flight 94
Summary 95
Chapter 6: Generating a Never-Ending World 97
Designing levels with the SpriteKit scene editor 98
Separating level data from game logic 99
Using custom classes in the scene editor 99
Building encounters for Pierre Penguin 99
Creating our first encounter 100
[ iii ]