Swift (iOS/macOS) Application Architecture: From Basics to Patterns

This book is a practical guide to designing and developing Swift applications for the Apple ecosystem. It's not about syntax or language basics, but about how to turn a set of screens and data models into a flexible, testable, and easily maintainable system.

Who is this book for?

• Junior iOS/macOS developers who want to move to the next level.
• Middle-level developers looking to systematize their knowledge and learn modern approaches.
• Team Leads seeking well-founded arguments for choosing an architecture in a new project.

What will you learn?

• SOLID Principles in Swift: how to apply them in practice, not just memorize definitions.
• Design Patterns: from classic (MVC, Delegation, Observer) to modern (MVVM, Coordinator, Redux approaches).
• Dependency Injection (DI): manual and via libraries (Swinject, Resolver).
• Working with Multithreading: Grand Central Dispatch, OperationQueue, Swift Concurrency (async/await, actors).
• Architecture Testing: how to write unit tests for ViewModels, services, and coordinators.
• Refactoring: a step-by-step process of turning "spaghetti code" into a modular system.

Book Structure:

Each chapter contains a theoretical part, a practical example (from a simple todo app to a full-fledged news API client), and self-test questions. You won't just read about patterns — you'll implement them in a real project, improving its architecture step by step.

What makes this book different?

• Focus on practice: minimal fluff, maximum code and diagrams.
• Covers both platforms: iOS and macOS.
• A chapter on testing architectural decisions — a rarity for Swift books.
• Up-to-date: the book is written with Swift 5.9+ and Xcode 15+ in mind.

After reading, you will be able to confidently design applications that are easy to scale and maintain, and provide reasoned answers to the question: "Why did we choose this particular architecture?".

The book is suitable both for self-study and for preparing for interviews at companies that value quality code.