GraphQL on Swift: A Complete Guide to Development for iOS and macOS

The book "GraphQL on Swift (iOS/macOS)" is a practical guide for developers who want to master a modern approach to building client-server applications. You will learn how to effectively integrate GraphQL into Swift projects for iOS and macOS, leveraging the power of declarative queries and the flexibility of typed schemas.

What is this book about?

The book covers the full lifecycle of working with GraphQL on Swift: from the basics of theory to advanced techniques. You will learn how to:

• Design GraphQL schemas and understand their types (Object, Scalar, Enum, Interface, Union).
• Set up Apollo iOS — the most popular GraphQL client for Swift.
• Execute queries, mutations, and subscriptions with error handling.
• Work with client-side data caching (Apollo normalized cache).
• Integrate GraphQL with SwiftUI, Combine, and UIKit architectures.
• Test and debug GraphQL queries using tools like GraphQL Playground.
• Develop real applications — from a simple task list to a complex chat with subscriptions.

Who is this book for?

The book is suitable for beginners who are just starting their journey with client-server development in Swift, as well as experienced iOS/macOS developers looking to transition from REST to the more flexible GraphQL. Basic knowledge of Swift and Xcode is assumed, but all GraphQL concepts are explained from scratch.

What will you learn?

• How GraphQL differs from REST and why it is becoming the standard for modern applications.
• How to generate typed Swift code based on a GraphQL schema.
• How to manage application state using Combine and GraphQL subscriptions.
• How to optimize performance: pagination, fragments, directives (skip, include).
• How to work with authorization and tokens in GraphQL queries.
• How to migrate an existing application from REST to GraphQL without losing functionality.

Why should you read this book?

GraphQL is not just a replacement for REST, but a new paradigm that makes client-server interaction transparent and predictable. With this book, you will not only learn the syntax and tools but also understand how to think in terms of GraphQL to create scalable and maintainable applications. Each chapter contains practical examples that you can immediately apply to your own project.

The book is written in accessible language, contains numerous illustrations and step-by-step instructions. It will become your reliable assistant in mastering one of the most in-demand technologies in the world of mobile development.