Concurrency in Swift: Developing Parallel Applications for iOS and macOS

The book "Concurrency in Swift" is a comprehensive guide to creating responsive and performant applications for iOS and macOS. In modern mobile and desktop application development, the ability to skillfully manage parallel tasks has become an essential skill. The author, Alexey Romanov, a senior iOS developer with 10 years of experience, systematically covers all aspects of concurrent programming in Swift — from the classic Grand Central Dispatch (GCD) to the modern async/await model and actors.

Who is this book for?

• iOS/macOS developers of any level who want to deepen their understanding of multithreading;
• Junior developers who want to stop fearing deadlocks and race conditions;
• Senior engineers looking for best practices for high-load applications;
• Those migrating from Objective-C to Swift and wanting to master modern approaches.

What you will learn:

• Fundamentals of parallelism: threads, queues, synchronization;
• Grand Central Dispatch: dispatch queues, groups, semaphores, barriers;
• Modern Swift Concurrency: async/await, Task, TaskGroup;
• Actors and data isolation for safe shared state;
• Working with global and custom executors;
• Debugging concurrent code: Xcode tools, Thread Sanitizer;
• Real-world cases: image loading, large data processing, UI updates;
• Performance: measurement, profiling, eliminating bottlenecks.

The book contains over 50 practical examples in Swift, ready for use in real projects. Each chapter concludes with exercises to reinforce the material. Special attention is given to typical errors: data races, deadlocks, and memory leaks when working with closures.

Unlike purely theoretical guides, this book offers a step-by-step approach: you will start with simple GCD queues, then move on to async/await, and finally master actors — a powerful Swift tool for safe concurrent code. The author shares techniques that will help you write not only working but also maintainable code.

"Concurrency in Swift" will become your desktop reference when developing complex iOS/macOS applications — from games to financial trackers. After reading it, you will be able to confidently design multithreaded systems, avoiding classic pitfalls and achieving maximum performance.