Async Swift (iOS/macOS): The Complete Guide

"Asynchronous Swift (iOS/macOS): The Complete Guide" is a comprehensive practical guide to all aspects of asynchronous programming in the Apple ecosystem. The book covers the evolution of technologies: from classic Grand Central Dispatch (GCD) and Operation Queues to the revolutionary async/await model, introduced in Swift 5.5 and developed in subsequent versions of the language.

Who this book is for:

• iOS/macOS developers who want to migrate from GCD to modern async/await;
• Junior and Middle specialists looking to systematize their knowledge of multithreading;
• Senior developers seeking a deep understanding of the internal workings of Swift Concurrency;
• Anyone writing for watchOS or tvOS and facing UI performance issues.

What you will learn:

• How async/await, Task, TaskGroup, and structured concurrency work;
• Proper use of actors for safe shared data access;
• Deep dive into MainActor and @Sendable for UI threads;
• Migrating legacy code from GCD to the new model without performance loss;
• Error handling in asynchronous chains, task cancellation, and lifecycle management;
• Advanced patterns: Combine + async/await, async sequences, AsyncStream;
• Profiling and debugging asynchronous code in Xcode Instruments.

The book is structured as a sequential course: each chapter contains theory, code examples (downloadable), exercises for reinforcement, and common pitfalls. Special attention is paid to practical scenarios: network data loading, working with Core Data and SwiftData, UI updates, gesture handling, and animations in an asynchronous context.

Why you should read it: asynchronicity is one of the most complex topics in iOS development. Mistakes here lead to freezes, memory leaks, and app crashes. This guide will help you write not only fast but also reliable code that is easy to maintain. The author shares real-world cases from App Store projects and provides ready-made solutions for production.

The book is suitable both for self-study and for teams adopting modern Swift standards. After reading it, you will be able to confidently design asynchronous architectures, avoid blocking, and create responsive applications for the entire Apple ecosystem.