Refactoring Swift (iOS/macOS) Code

The book "Refactoring Swift (iOS/macOS) Code" is a practical guide for developers who want to improve the quality of their Swift projects. Unlike abstract theories, the material focuses on real-world examples from iOS and macOS development: from refactoring ViewController to optimizing Core Data and Combine.

Who this book is for

• iOS/macOS developers with 1+ year of experience who encounter "dirty" code in legacy projects.
• Team leads and senior engineers looking to implement refactoring practices within their team.
• Junior developers striving to write maintainable code from the start.
• Freelancers working with other people's projects and needing quick code navigation.

What you will learn

• How to identify code smells in Swift projects: massive ViewController, spaghetti code, logic duplication.
• Safe refactoring techniques: extracting protocols, dependency injection, replacing inheritance with composition.
• Working with UIKit and SwiftUI: refactoring screens, moving business logic to services, using MVVM and Coordinator.
• Performance optimization: eliminating memory leaks (retain cycles), improving work with Core Data and parallel computing.
• Automating refactoring: using Xcode Refactoring Tools, SwiftLint, XCTest for regression testing.

Why this book is useful

The book is built on the "from problem to solution" principle. Each chapter starts with real problematic code, which is then gradually improved. You will get ready-made checklists for project auditing and refactoring templates that can be immediately applied in Xcode. Special attention is given to migrating from UIKit to SwiftUI and working with async/await.

The author is a practicing iOS developer with 8 years of experience, who has participated in refactoring large commercial applications (banking, e-commerce, media). All examples are tested for compatibility with Swift 5.9+ and Xcode 15.

The book is useful both for self-study and as a reference during code reviews. After reading it, you will be able to confidently tackle refactoring any project, maintaining its functionality and reducing technical debt.