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Home > Game Development > Mobile Game Development > Getting Started with SpriteKit
Getting Started with SpriteKit
Getting Started with SpriteKit

Getting Started with SpriteKit:

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Getting Started with SpriteKit

Chapter 2. What Makes a Game a Game?

In Chapter 1, The First Step toward SpriteKit, we set the basis of our game by adding a background and the first sprite to our project. In the following pages, I will show you the key elements that take part in every game, such as the movement of sprites in a scene, the detection of touches, and the handling of collisions. You will also learn how to add labels to a scene and play music and sound effects.

The things that you will learn in this chapter are as follows:

  • How to detect touch interaction
  • How to execute actions on sprites
  • How to handle collisions
  • Creating and updating labels
  • Playing music and sound effects

Handling touch events

Our beloved main character is supposed to run though several doors, but some of them are closed and others are open, so it will need to move laterally to choose the right ones. We will need to handle the players' interaction to help the rabbit properly select a door.

By default, SpriteKit listens to touch events, and we can manage them by implementing some of the methods provided by the UIResponder class, which is the parent class of SKNode.

The following four methods are available if you wish to detect and handle touches:

  • The touchesBegan method: This method is triggered as soon as the user touches the screen, and it can detect one or more touches. That's why it receives a set of UITouch instances. We can use this method to select the place where we want the rabbit to be moved in the game.
  • The touchesMoved method: This method will be triggered when one or more fingers that are touching the screen begin to move. We can take advantage of this method to update...

1-star challenge: an easier way to reset position

I chose the solution of running two actions in order to recover the initial position because I wanted to introduce you to sequences, but there is an easier and fancier way of achieving the same result. With the knowledge that you have so far, try to get the same results that you got when using a sequence.

Solution

The key to this challenge is to use the runAction(_:, completion:) method so that we can execute the same block of code as that of resetPositionAction. Go to the initializeWallMovement method and replace moveWallAction with the following code:

wall.runAction(moveWallAction, completion: {
    self.wall.position = CGPoint(x:(self.view!.bounds.size.width/2), y: self.view!.bounds.size.height + self.wall.frame.size.height/2)
})

There you are. With this change, you will just execute one action with a completion block associated with it, thus obtaining the same behavior as the one that you got before.

Creating loops

Now that we have the wall...

Collision management

In the previous section of this chapter, we learned the most important techniques to perform actions on nodes, namely movements. Now that everything is moving, we need a way to detect when the main character tries to cross a closed door (a wrong door) or an open one (a correct door).

Detecting and handling collisions is one of the main techniques in game development, as a vast percentage of games is founded upon enemies trying to hit our character in many different ways or the player trying to kill the enemies by shooting them, jumping at them, and so on. But, what is a collision?

Understanding collisions

In game development, a collision is an intersection between two or more elements in a scene. There are different ways to detect them, from the most basic's such as checking whether the area of the frame of each node intersects other nodes' frames, to the advanced ones such as making use of the physics engines that most of the games' engines (including SpriteKit...

1-star challenge: check collisions accurately

We learned how to detect collisions thanks to the intersects method provided by CGRect, but in this way, the collision will be triggered as soon as the rabbit's ears touch the doors. Let's add another condition to the if statement in detectCollisions in order to take into account the rabbit's and door's frame position. Thus, the collision will only happen when the door reaches half the rabbit's frame. As shown in the following screenshot:

1-star challenge: check collisions accurately

Solution

This challenge is very easy and I hope you were able to solve it. To perform this check, you just need to add the following condition to the if statement:

&& (node.position.y - node.frame.height/2) <= self.rabbit.position.y

Keep this line in the code as we are going to use this condition in order to make the collisions more realistic.

Creating labels

In almost every game, there are different elements (scores or text labels) to provide visual information to the player and give them an incentive to keep playing in order to beat its score record. In this section, we are going to learn how to add these informative elements to a scene.

In SpriteKit, we have a class named SKLabelNode that inherits from SKNode and provides all the methods and attributes to load fonts and manage every label that we want to show on the screen. We are going to use this class to add a score label at the top-right side of the screen and update it, as the rabbit avoids wrong doors.

Let's start by creating our first label. Then, we will learn how to update it programmatically. For this purpose, we are going to need a new variable. So, add the following line to GameScene just after the declaration of isCollisionDetected:

private var labelScore: SKLabelNode!

Next, we need to call a method to initialize it. So, add the following line at the end of didMoveToView...

Handling touch events

Our beloved main character is supposed to run though several doors, but some of them are closed and others are open, so it will need to move laterally to choose the right ones. We will need to handle the players' interaction to help the rabbit properly select a door.

By default, SpriteKit listens to touch events, and we can manage them by implementing some of the methods provided by the UIResponder class, which is the parent class of SKNode.

The following four methods are available if you wish to detect and handle touches:

  • The touchesBegan method: This method is triggered as soon as the user touches the screen, and it can detect one or more touches. That's why it receives a set of UITouch instances. We can use this method to select the place where we want the rabbit to be moved in the game.

  • The touchesMoved method: This method will be triggered when one or more fingers that are touching the screen begin to move. We can take advantage of this method to update a node's position...

1-star challenge: an easier way to reset position

I chose the solution of running two actions in order to recover the initial position because I wanted to introduce you to sequences, but there is an easier and fancier way of achieving the same result. With the knowledge that you have so far, try to get the same results that you got when using a sequence.

Solution

The key to this challenge is to use the runAction(_:, completion:) method so that we can execute the same block of code as that of resetPositionAction. Go to the initializeWallMovement method and replace moveWallAction with the following code:

wall.runAction(moveWallAction, completion: {
    self.wall.position = CGPoint(x:(self.view!.bounds.size.width/2), y: self.view!.bounds.size.height + self.wall.frame.size.height/2)
})

There you are. With this change, you will just execute one action with a completion block associated with it, thus obtaining the same behavior as the one that you got before.

Creating loops

Now that we have the wall...

Collision management

In the previous section of this chapter, we learned the most important techniques to perform actions on nodes, namely movements. Now that everything is moving, we need a way to detect when the main character tries to cross a closed door (a wrong door) or an open one (a correct door).

Detecting and handling collisions is one of the main techniques in game development, as a vast percentage of games is founded upon enemies trying to hit our character in many different ways or the player trying to kill the enemies by shooting them, jumping at them, and so on. But, what is a collision?

Understanding collisions

In game development, a collision is an intersection between two or more elements in a scene. There are different ways to detect them, from the most basic's such as checking whether the area of the frame of each node intersects other nodes' frames, to the advanced ones such as making use of the physics engines that most of the games' engines (including SpriteKit) provide...

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Page 1 of 9

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Key benefits

  • Learn the key concepts of game development in iOS
  • Take advantage of SpriteKit to create your own games and improve your apps
  • Follow the step-by-step chapters to create a complete product ready to submit to the App Store

Description

SpriteKit is Apple’s game engine to develop native iOS games. Strongly boosted by the Apple Inc., Cupertino, it has increased in popularity since its first release. This book shows you the solutions provided by SpriteKit to help you create any 2D game you can imagine and apply them to create animations that will highlight your existing apps. This book will give you the knowledge you need to apply SpriteKit to your existing apps or create your own games from scratch. Throughout the book, you will develop a complete game. The beautiful designs implemented in the game in this book will easily lead you to learn the basis of 2D game development, including creating and moving sprites, and adding them to a game scene. You will also discover how to apply advanced techniques such as collision detection, action execution, playing music, or running animations to give a more professional aspect to the game. You will finish your first game by learning how to add a main menu and a tutorial, as well as saving and loading data from and to the player’s device. Finally, you will find out how to apply some mobile games techniques such as accelerometer use or touch detection.

Who is this book for?

Getting Started with SpriteKit is for beginner-level iOS developers who want to add an extra edge to their apps and create amazing games using SpriteKit. It doesn’t matter whether you have experience in iOS development or not as this book will show you the swift tricks you can use to create games.

What you will learn

  • Create and configure a SpriteKit project from scratch
  • Load and manage the basic elements of games such as sprites, labels, and geometrical primitives
  • Handle touch events, detect collisions, and play sound audio files
  • Create complex elements, animate sprites, and run the parallax effect
  • Complete your games with key components such as a main menu, transitions between scenes, a tutorial, and the ability to load and save data
  • Increase the efficiency of your device using the accelerometer or by adding shaders, lights, and shadows
  • Gain complementary techniques such as creating or finding audio resources, applying SpriteKit to apps, or using third-party tools

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Jan 25, 2016
Length: 226 pages
Edition : 1st
Language : English
ISBN-13 : 9781785885280
Category :
Game Development
Concepts :
Mobile Game Development
Tools :
SpriteKit

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Product feature icon Download this book in EPUB and PDF formats
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Product Details

Publication date : Jan 25, 2016
Length: 226 pages
Edition : 1st
Language : English
ISBN-13 : 9781785885280
Category :
Game Development
Concepts :
Mobile Game Development
Tools :
SpriteKit

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Table of Contents

7 Chapters
1. The First Step toward SpriteKit Chevron down icon Chevron up icon
1. The First Step toward SpriteKit
Game engines
Creating a new SpriteKit project
Running the project for first time
The SKNode class
SKScene
Your first game – InsideTheHat
Our first SKSpriteNode class
Adding a background
Working with screen resolutions
Summary
2. What Makes a Game a Game? Chevron down icon Chevron up icon
2. What Makes a Game a Game?
Handling touch events
1-star challenge: an easier way to reset position
Collision management
1-star challenge: check collisions accurately
Creating labels
Playing some music
2-star challenge: reproducing sound effects
Summary
3. Taking Games One Step Further Chevron down icon Chevron up icon
3. Taking Games One Step Further
Extending the SKNode class
2-star challenge: colliding puppets
The parallax effect
Creating animations in SpriteKit
2-star challenge: animate collisions
Geometrical primitives
Summary
4. From Basic to Professional Games Chevron down icon Chevron up icon
4. From Basic to Professional Games
Ending the game
3-star challenge: restarting a game
Creating a main menu
Transitions and scenes
Creating a tutorial
Loading and saving data
2-star challenge: completing the tutorial
Summary
5. Utilizing the Hardware and Graphics Processor Chevron down icon Chevron up icon
5. Utilizing the Hardware and Graphics Processor
Using the accelerometer
Adding shaders to our game
Turning on the lights
2-star challenge: moving lights
Summary
6. Auxiliary Techniques Chevron down icon Chevron up icon
6. Auxiliary Techniques
Creating particle systems
Combining SpriteKit and UIKit
Using third-party tools
How to find audio files
How to find images
Summary
Index Chevron down icon Chevron up icon
Index

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Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.2
(5 Ratings)
5 star 60%
4 star 0%
3 star 40%
2 star 0%
1 star 0%
The_Gamebook_Nook Jul 23, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
You will make a simple game, and will have knowledge / intuition to tweak it or make your own version. As a tutor and a student, i found this book to be effective.
Amazon Verified review Amazon
SuJo Feb 27, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Excellent resource on learning SpriteKit, much easier than the older methods for creating iOS games. It's easy to follow along with, the project created in the book covers all the basics and even get's you up to submitting your application to Apple which is really helpful. I don't really enjoy following along in a book and getting to the end just to see I'll need to pickup another book to continue onward, this book didn't do that and I highly recommend it.
Amazon Verified review Amazon
pauland Feb 25, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I've seen a few books on SpriteKit and I think this is probably the easiest to assimilate. The book is mostly built around a single game project that expands in completeness/complexity as the book progresses. The author takes you from a very simplistic app to one that has simple gameplay but covers all of the basic operation of SpriteKit to a complete app that includes sound, hardware interaction and particle emitters.At first I did wonder if this concentration on a single game would be limiting, but it is not. The author takes the time to explain just about everything and the one game really is an ideal vehicle to understand what you need to build just about any game with SpriteKit. I particularly liked the section about adding shadows.A great intro to Spritekit, clearly explained and with some very practical information about handling Audio.
Amazon Verified review Amazon
Dave Aug 15, 2019
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
The book presents, in a pretty straightforward way, how to get a project up and running. However, I was unable to make progress past the beginning of the overall project, since the download files are impossible to obtain from the PacktPub site. To their credit, the publishing company responded in a timely fashion to my plight, and provided links to all of the necessary materials. So, I have upgraded my assessment.
Amazon Verified review Amazon
Vince Nov 13, 2017
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
Um. Not sure. One the one hand this book covers the subject I am interested in - SpriteKit - on the other hand it seems to be very superficial in its coverage of details; by which I mean it falls back frequently on the standard documentation. It reads very much written to order rather than written from self motivation.
Amazon Verified review Amazon

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About the author

Profile icon Jorge Jordán
Jorge Jordán
Jorge Jordán is an iOS indie developer who's passionate about how things work since his childhood. This is the reason why he graduated in computer science and became a Java developer. After buying his first iPhone, he became deeply interested in its technology and spent his spare time learning how to develop apps for Apple's smartphones. Over time, he founded www.insaneplatypusgames.com, where he tries to make his dreams and games come true. He is also a member of the tutorial team at www.raywenderlich.com. Also, he has worked on a book titled Cocos2d Game Development Blueprints, Packt Publishing. In his free time, he loves to play video games, play bass guitar, and watch TV series. You can follow him on Twitter; his Twitter handle is @jjordanarenas.
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Our eBooks are currently available in a variety of formats such as PDF and ePubs. In the future, this may well change with trends and development in technology, but please note that our PDFs are not Adobe eBook Reader format, which has greater restrictions on security.

You will need to use Adobe Reader v9 or later in order to read Packt's PDF eBooks.

What are the benefits of eBooks? Chevron down icon Chevron up icon
  • You can get the information you need immediately
  • You can easily take them with you on a laptop
  • You can download them an unlimited number of times
  • You can print them out
  • They are copy-paste enabled
  • They are searchable
  • There is no password protection
  • They are lower price than print
  • They save resources and space
What is an eBook? Chevron down icon Chevron up icon

Packt eBooks are a complete electronic version of the print edition, available in PDF and ePub formats. Every piece of content down to the page numbering is the same. Because we save the costs of printing and shipping the book to you, we are able to offer eBooks at a lower cost than print editions.

When you have purchased an eBook, simply login to your account and click on the link in Your Download Area. We recommend you saving the file to your hard drive before opening it.

For optimal viewing of our eBooks, we recommend you download and install the free Adobe Reader version 9.