Swift Interview (iOS/macOS): 200 Questions and Answers

The book "Swift Interview (iOS/macOS): 200 Questions and Answers" is a practical guide for anyone preparing for a technical interview for an iOS or macOS developer position. It contains the most common and tricky questions asked in interviews at Russian and international IT companies, along with detailed answers with code examples and explanations.

What is this book about?

The book covers all key topics necessary for successfully passing an interview:

• Swift Basics — data types, optionals, memory management (ARC, retain cycles), protocols, extensions, generics.
• iOS/macOS Development — UIKit, SwiftUI, AppKit, application lifecycle, working with Core Data, URLSession, GCD, OperationQueue.
• Architecture and Patterns — MVC, MVVM, Coordinator, DI, SOLID, KISS and DRY principles.
• Multithreading — Grand Central Dispatch, async/await, Thread Safety, race conditions, deadlocks.
• Networking and Data Handling — REST API, JSON Codable, Combine, URLSession, caching.
• Testing — Unit tests, UI tests, mock objects, TDD.
• Tools and Practices — Xcode, Instruments, CocoaPods/SPM, Git, Code Review, CI/CD.

Who is this book for?

• Junior developers — systematize your knowledge and learn what is asked in first interviews.
• Middle developers — fill gaps in complex topics (multithreading, architecture, optimization).
• Senior developers — use the book as a cheat sheet for preparing for interviews at FAANG and top companies.
• Team leads and HR — get a ready-made list of questions for conducting technical interviews.

What will you learn after reading?

• How to answer questions about ARC, retain cycles, and weak references without hesitation.
• What is the difference between value and reference types, and when to use which.
• How to properly design application architecture in SwiftUI and UIKit.
• How to avoid race conditions and deadlocks when working with multithreading.
• Which algorithms and data structures are most often asked in Swift interviews.
• How to prepare a portfolio and answer behavioral questions.

The book is written in simple and understandable language, contains real code examples and comments for each answer. You can use it both for self-study and as a reference before an interview.

Format: PDF, 250 pages, code examples in Swift 5.9+.