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The Ultimate iOS Developer Interview Handbook (2026 Edition)
620 Q&A: Swift 6, SwiftUI, Objective-C & System Design
This book is 100% completeLast updated on 2026-11-06
620 iOS interview questions and answers, from Objective-C to Swift 6, SwiftUI, system design and Apple Intelligence. Updated for 2026, for junior to senior and architect interviews.
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About
About the Book
A complete iOS interview preparation system: 620 questions and answers, from Objective-C fundamentals to Swift 6, SwiftUI, SwiftData, system design, Core ML, leadership and Apple Intelligence. Whether you're preparing for your first iOS role or a senior or architect interview at a top product company, this handbook gives you clear answers, real code, and the current 2026 context interviewers expect. New in Version 2.0 (October 2026): a new What's New in 2026 section (Swift 6 migration, approachable concurrency, Foundation Models, App Intents, Swift Testing, Observation, macros, Liquid Glass, privacy manifests, the UIScene requirement and more), "2026 Update" notes throughout, and outdated content removed. 11 sections inside: Objective-C & Legacy Interop: runtime, ARC, blocks, KVC/KVO, bridging with Swift 6 Swift Language & Concepts: optionals, generics, protocols, Codable, Swift Concurrency SwiftUI, Combine & SwiftData: data flow, navigation, animation, Observation iOS Frameworks: UIKit, Core Data, AVFoundation, Core Location, MapKit, Core Bluetooth, HealthKit, URLSession, background tasks System Design & Architecture: MVVM, VIPER, Clean, coordinators, modularization, design patterns Leadership & Behavioral Scenarios: mentoring, conflicts, tech debt, incidents SwiftUI Advanced Topics: layout internals, PreferenceKeys, gestures, Canvas, performance SwiftData, Core Data & Offline Sync: migrations, background work, CloudKit sync Core ML, Vision & ARKit: model integration, optimization, RealityKit Performance, Security & Optimization: launch time, memory, Keychain, encryption, a release checklist What's New in 2026: Swift 6, Apple Intelligence, iOS 26 & 27 Professionally typeset, with syntax-highlighted code, a clickable table of contents, PDF bookmarks for every question, a topic index, a 4-week study plan and a 3-day pre-interview plan. Who this is for: iOS developers preparing for junior, mid or senior interviews, engineers moving into Tech Lead or Architect roles, and developers maintaining mixed Objective-C and Swift codebases. Format: PDF, 232 pages, 11 sections, 620 questions. Swift 6.2, iOS 26 & iOS 27 ready. Free sample: download it to see all 620 questions in the contents, plus excerpts from Swift, System Design and What's New in 2026 before you buy.
About the author: Puneet Shah is a Senior iOS Engineer with 12+ years of experience. Also by the author: Senior iOS Interview: The Complete Guide (2026 Edition), 235 senior-level questions on architecture, Swift 6 and system design (leanpub.com/senior-ios-interview-guide), and AI for Senior iOS Engineers: The Interview Guide (leanpub.com/ai-ios-interview-guide).
Author
About the Author
Puneet Shah
Puneet Shah is a senior iOS engineer with 12+ years of experience building production apps in Swift and Objective-C. He currently works at a leading MNC on a large-scale consumer iOS app. He writes practical, up-to-date interview guides for mobile engineers, focused on what interviewers ask in senior, lead and architect rounds. His books cover Swift 6, SwiftUI, Objective-C, mobile system design and, most recently, building AI features on Apple platforms.
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