iOS developer interview prep

Curated list of topics for iOS development with links to resources. This place would help beginners and experienced developers prepare for the interview.

Complete version of the list in the form of a course Contact me via Telegram

Algorithms

• Solutions to LeetCode in Swift
• Data structures & algorithms

Language

Swift

• Value vs Reference, Stack vs Heap
• COW
• Closures
• Method dispatch
• Generics

Memory management

• ARC, memory, strong weak unowned, management issues
• Stack VS Heap, Stack Promotion, Boxing of Swift Value Types
• Memory layout in Swift (Highly recommend)
• Advanced iOS memory management
• Capture list
• Autorelease
• unsafe_unretained
• Memory leaks
• Manual memory management

Concurrency

• NSOperation
• GCD with examples
• Concurrency Programming Guide
• Parallel programming with swift
• Threading Programming Guide
• Concurrency pitfalls
• Avoiding race conditions
• Thread safety in iOS to avoid race conditions/deadlock

Other

• Swift Concurrency Documentation
• ?Async/Await
• ?Actors and Async/Await

UIKit

App

• Managing Your App's Life Cycle
• Application life cycle in iOS
• Relationship between UIApplication, UIApplicationDelegate, UISceneDelegate

View controller

• UIViewController lifecycle

View

• UIView and UIWindow programming guide
• UIView vs CALayer
• Layout cycle

Layout

• Compression resistance and hugging priority
• Frame vs Bound

Other

• Using Responders and the Responder Chain to Handle Events
• Hit testing

Architecture

• MVC
• Service-Oriented Architecture
• Modular architecture
• ?VIPER
• ?Implementing VIPER architecture
• ?MVVM

Other

• Composable Architecture

Fundamental knowledge

• OOP
• Design Patterns
• Cocoa Design Patterns
  • old version
  • new version
  • KVC
  • KVO
• POP
• Protocol and Value oriented programming in UIKit Apps
• Github repo showing SOLID principles
• SOLID in Swift
• DI

Other

• Declarative vs Imperative programming

Testing

You need to be able to write a small test (possibly refactor the code prior to implementing the test).

• XCTest

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Further material is not asked in the interview, but nice to know

Library

• What is a library
• Static and dynamic frameworks
• CocoaPods Under The Hood
• Carthage or cocoapods
• SPM
• Binary Frameworks in Swift

Xcode

• Xcode build system
• A dive into Xcode projects and workspaces
• Xcode concepts
• Managing different Environments using XCode Build Schemes and Configurations
• Distribution

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Community

• Hopefully, you found the following material useful. It will always be open to improvement. If you find a great material that you think is frequently asked on the interviews, do not hesitate to submit a PR.
• You find a broken link, please, contact me on one of socials below or drop an issue on the repo!

Mock Interview

I also conduct mock interviews. You can schedule one by contacting me on one of these socials.
📩 - [email protected]
✈️ - http://t.me/ya_miras