Learning Design Patterns with Unity: Learn the secret of popular design patterns while building fun, efficient games in Unity 2023 and C#

Harrison Ferrone

$44.99

4.8 (30 Ratings)

Paperback May 2024 676 pages 1st Edition

Harrison Ferrone

$44.99

4.8 (30 Ratings)

Paperback May 2024 676 pages 1st Edition

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Learning Design Patterns with Unity

Managing Access with the Singleton Pattern

In the last chapter, we went over the core of what design patterns are, the common problems they solve, and how we’ll go about learning and implementing each of them throughout our adventure. In this chapter, we’ll start our practical journey by exploring the Singleton pattern, which helps when you want a single instance of a class to be globally accessible. For applications and games, you’ll commonly see this type of functionality with manager or service classes that keep track of global state or provide access to system-wide utilities. However, we need to be aware of potential risks with global state (and how to protect our newly accessible data), which we’ll discuss later in the chapter.

Anytime you bring up the Singleton pattern in programming circles, you’re likely to hear an audible sigh, some hushed booing, and maybe even an angry shout or two. And that’s precisely why I like to teach this...

Updating a MonoBehavior into a persistent singleton

Imagine you are building a platforming game where the player collects items through multiple levels. Your team lead asks you to create a manager script to track the player’s score, handle scene transitions, and ensure there’s always one unique instance in a scene. Our first task is to ensure that the game manager class in the starter project only ever has one active instance.

Open Manager.cs and update the code to match the following code, which sets the singleton instance or destroys the GameObject that the script is attached to if an instance already exists:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;
public class Manager : MonoBehaviour
{
    // 1
    public static Manager Instance;    
    public int score = 0;
    public int startingLevel = 1;
    // 2
    void Awake()    
    {
        // 3
        if(Instance...

Creating singletons as ScriptableObjects

Imagine you and your design team need to create, configure, and test singleton classes in the Unity Editor. Using ScriptableObjects as data containers not only frees you from attaching your scripts to GameObjects but also gives you the freedom to create singleton assets from the Asset menu. Both added features make scriptable objects a good fit to address testing concerns with the Singleton pattern, and it is much easier for non-programming members of your team to work with them.

Your last task in this chapter is to create a generic singleton as a ScriptableObject asset in the project. In the Scripts folder, create a new C# script, name it ScriptableSingleton, and update its code to match the following code. This script creates a generic ScriptableObject class that we can use to fetch a unique instance from the project resources when queried:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
// 1
public...

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Key benefits

Craft engaging Unity 2023 games while mastering design patterns like Singleton, Object Pool, and more
Write clean, reusable C# code using creational, behavioral, and structural patterns, tailored for the game development environment
Go beyond basic design pattern usage and learn to customize and extend them for your unique game design needs

Description

Struggling to write maintainable and clean code for your Unity games? Look no further! Learning Design Patterns with Unity empowers you to harness the fullest potential of popular design patterns while building exciting Unity projects. Through hands-on game development, you'll master creational patterns like Prototype to efficiently spawn enemies and delve into behavioral patterns like Observer to create reactive game mechanics. As you progress, you'll also identify the negative impacts of bad architectural decisions and understand how to overcome them with simple but effective practices. By the end of this Unity 2023 book, the way you develop Unity games will change. You'll emerge not just as a more skilled Unity developer, but as a well-rounded software engineer equipped with industry-leading design patterns.

Who is this book for?

This book is your perfect companion if you're a Unity game developer looking to level up your C# skills and embrace industry standards for building robust games. Knowledge of Unity and basic C# programming is recommended.

What you will learn

Implement a persistent game manager using the Singleton pattern
Spawn projectiles efficiently with Object Pooling for optimized performance
Build a flexible crafting system using the Factory Method pattern
Design an undo/redo system for player movement with the Command pattern
Implement a state machine to control a two-person battle system
Modify existing character objects with special abilities using the Decorator pattern

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Amazon verified reviews

Emmanuel Mensah Oct 29, 2024

Harrison Ferrone’s book is a fantastic introduction to design patterns for Unity developers. Right from the basics, like the difference between software architecture and software design, to advanced patterns such as Visitor and Decorator, Ferrone guides you with clarity and enthusiasm. The examples are relevant and explained in a way that builds a solid understanding without overwhelming the reader. I especially appreciated how he addresses common pitfalls with each pattern, which is often overlooked in technical books. It’s a well-organised guide for game developers wanting to produce clean, maintainable, and scalable code in Unity.

Amazon Verified review

Eric Montoya Jun 26, 2024

I received this as an ebook. This book is great for learning C# design patterns to have clean code and optimize your code. I really like how Harrison gives examples how to use each design patterns and pushes the envelope on what you could do with the patterns.He also presents the pros and cons of each pattern. Advising how to use each pattern. Then he teaches you how to program each pattern.This is a must book to take your Unity, C# programming, and game developer skills to the next level!!!

Nitin Dhami Jun 24, 2024

Whether you are an experienced developer or starting out in your journeyThis book is not going to disappoint you at all I came across this book on linkedinand that was a good recommendation it helps you understand Design patterns w.r.t games how to createmaintainable code bases and be a pro in it.This discuss all the aspects of how to be a senior engineer.Highly recommended.

Theodor Florian Purcaru Jun 18, 2024

“Learning Design Patterns with Unity” is a great book that offers a comprehensive guide to understanding and implementing design patterns in Unity. It is a great asset for beginners as an introduction to the most common problems and the best solutions you’d encounter as a Unity developer. It’s also a useful tool for advanced users wanting a refresher on patterns they might not encounter on a daily basis.The author, Harrison Ferrone, has done an excellent job presenting these solutions with near real world scenarios that can be quickly retrofitted in your own game. I can actually say many of my common solutions for game jams or even at work, are similar to what we see here, showing that the code can indeed work in the real world, which is also very useful and encouraging for applying what you learn directly on your own projects. Ferrone’s writing style is engaging and easy to follow, making it suitable for both beginners and experienced developers.This book will undoubtedly enhance your coding skills and inspire you to write better, more efficient code. Happy reading! 📚

Wolfgang Hendrix Aug 24, 2024

This book masterfully explores crafting reusable code through design patterns in Unity and C#. It tackles creational, behavioral, and structural patterns, offering strategies for when and how to apply them best. With clear guidance and practical examples, it’s a vital resource for developers at any stage, ensuring your code is efficient and maintainable. For those devoted to game development or software design, this book is a must.

Learning Design Patterns with Unity: Learn the secret of popular design patterns while building fun, efficient games in Unity 2023 and C#

What do you get with Print?

Learning Design Patterns with Unity

Managing Access with the Singleton Pattern

Technical requirements

Breaking down the pattern

Updating a MonoBehavior into a persistent singleton

Creating a generic singleton

Adding thread safety to the generic singleton

Creating singletons as ScriptableObjects

Summary

Further reading

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