Clean Code in Swift (iOS/macOS)

This book is a practical guide to writing clean, maintainable, and efficient code in Swift for iOS and macOS platforms. It is intended for developers who are already familiar with the basics of Swift and want to move to the next level by learning to create code that is easy to read, test, and modify.

What this book is about

Unlike many textbooks that focus on syntax or specific frameworks, this book is dedicated to the philosophy and practices of developing quality software. You will learn how to apply the SOLID, KISS, DRY, and YAGNI principles in the context of Swift projects. Special attention is given to:

• Naming conventions for variables, functions, and types that make code self-documenting.
• Effective work with optionals and error handling without unnecessary complexity.
• Designing application architecture (MVC, MVVM, Coordinator) with a focus on testability.
• Refactoring: how to safely improve existing code without breaking functionality.
• Writing unit and integration tests using XCTest.

Who this book is for

• Junior and Middle iOS/macOS developers who want to systematize their knowledge and get rid of "bad" practices.
• Teams transitioning from Objective-C to Swift — the book will help avoid common mistakes when migrating legacy code.
• Programmers striving for career growth — the ability to write clean code is often a key requirement for Senior positions.

What you will learn

• How to organize the project structure so that it is intuitive.
• Why "fast" code is not always "clean" and how to find the balance.
• Techniques for eliminating "spaghetti code" and huge ViewControllers.
• How to write functions that do only one thing, but do it well.
• Principles of working with protocols and extensions to create a flexible architecture.

Why you should read it

Code written according to the rules of "clean code" is easier to maintain, enhance, and hand over to other developers. This book is not just a set of rules, but a systematic approach that will help you spend less time debugging and more time creating truly high-quality products for the Apple ecosystem.

The book contains numerous examples in Swift, analysis of typical antipatterns, and exercises for independent work. After reading it, your code will become more professional, and development will become more predictable and enjoyable.