Swift Design Patterns

Introduction

The book "Swift Design Patterns" by Paul Hudson was published in 2021 and is a practical guide to applying classic design patterns in the Apple ecosystem. Paul Hudson is known for his Hacking with Swift project, which has helped thousands of developers master Swift and build applications for iOS and macOS. In this book, he doesn't just list patterns but shows how and when to use them in real projects.

What the book is about

The book covers more than 20 design patterns, divided into three main groups: creational, structural, and behavioral. Each pattern is examined with specific examples from iOS/macOS development practice. The author pays attention not only to classic implementations (e.g., Singleton, Factory, Observer) but also to modern approaches using Swift features — protocols, closures, generics, and value types. A special place is given to patterns characteristic of Cocoa Touch and SwiftUI: MVC, MVVM, Coordinator, Delegate, Target-Action, and others.

Who this book is for

The book is intended for developers who already have basic experience programming in Swift and are familiar with the fundamentals of iOS/macOS development. It will be useful both for beginners who want to systematize their knowledge of patterns and for experienced engineers seeking to improve the architecture of their projects. If you write applications in SwiftUI or UIKit and want to write cleaner, more maintainable, and testable code — this book is for you.

What the reader will learn

• Basic design patterns — Singleton, Factory, Builder, Prototype, Adapter, Decorator, Facade, Proxy, Observer, Strategy, Command, Memento, State, Template Method, Visitor, and others.
• Applying patterns in iOS/macOS — how to implement Delegate, Data Source, Target-Action, Responder Chain, Coordinator, MVVM, and MVC in real applications.
• Modern Swift features — using protocols with associated types, closures, and enums to implement patterns without classes.
• Anti-patterns and common mistakes — the author warns about typical pitfalls, such as overusing Singleton or misusing delegation.
• Architectural decisions — how to combine patterns to build a flexible and testable architecture.
• Practical code examples — each pattern is accompanied by Swift code listings with explanations.

Strengths

One of the book's main advantages is its practical focus. Paul Hudson does not delve into excessive theory but immediately shows how a pattern solves a specific problem in an iOS application. The code is written cleanly, using modern Swift idioms (e.g., value semantics instead of reference types where appropriate). The book is well-structured: each pattern is described using a consistent template — problem, solution, implementation, example, recommendations. It is also worth noting that the author examines patterns in the context of SwiftUI, making the book relevant for developers transitioning to the new paradigm. The writing style is light, with a touch of humor, which makes complex topics easier to digest.

Who it is recommended for

The book will be useful for anyone writing in Swift and wanting to improve the quality of their code. I especially recommend it to:

• iOS developers with at least 1 year of experience who want to systematize their knowledge of patterns;
• developers transitioning from Objective-C to Swift who need modern examples;
• team leads and architects looking for ways to improve the architecture of existing projects;
• students and beginners who have already mastered the basics of Swift and want to move to the next level.

If you are looking for a book that doesn't just list patterns but teaches you how to apply them in real development