Swift (iOS/macOS) Application Architecture. Patterns and Practices

Modern iOS and macOS development requires not only knowledge of the Swift language but also the ability to design flexible, testable, and easily maintainable architecture. The book "Swift Application Architecture" is a practical guide that will take you from basic principles to advanced patterns used in large commercial projects.

What this book is about

You will learn how to choose the right architecture for a specific task, avoid "spaghetti code," and properly separate responsibilities between application layers. The book covers in detail:

• Classic patterns: MVC, MVP, MVVM — their strengths and weaknesses in the context of Swift and Apple platforms.
• Modern approaches: VIPER, Clean Swift (VIP), Coordinator — modularity, testability, and loose coupling.
• Working with Combine and SwiftUI — reactive architectures, state management, Data Flow.
• Dependency Injection (DI) — manual and using frameworks (Swinject, Resolver).
• Refactoring legacy projects — how to gradually migrate from MVC to MVVM or VIPER without stopping development.
• Architecture testing: unit tests, UI tests, mocking and stubbing.

Who this book is for

• Junior and Middle iOS/macOS developers who want to level up and write code that is easy to extend and maintain.
• Team Leads and architects looking for a systematic approach to application design.
• Developers transitioning from UIKit to SwiftUI — the book helps understand how architecture changes when moving to a declarative UI.

What you will learn

• How to distinguish good architecture from bad using real-world examples.
• How to organize navigation and routing without hardcoding.
• How to integrate Core Data, Networking, and other services into a clean architecture.
• How to write tests for each layer of the application.
• How to design multi-module applications using Swift Package Manager.

The book contains over 50 ready-to-use code examples and step-by-step instructions for applying each pattern. All examples are compatible with the latest versions of Swift, Xcode, iOS 17+, and macOS 14+.

Architecture is not a luxury, but a necessity. Make your code clean and predictable.