iOS Interv

Apuntes

•Introduction Whether you're pursuing your first iOS role, aiming for a senior position, or breaking into remote freelance work, this cheat sheet is for you. It features 20 real interview questions from top companies and contracts I’ve secured myself. No fluff—just the core concepts you need to master across Swift, SwiftUI, UIKit, threading, memory management, and more. For a deeper dive into these topics, I cover them extensively in the iOS Interview Prep Course. •Main Topics and Questions 1. What’s the difference between struct and class in Swift? Structs are value types; they get copied when assigned or passed. Classes are reference types; they are shared in memory via references. Value types are safer in concurrent environments and preferred in Swift unless reference semantics, inheritance, or identity are needed. Classes require manual memory management and are more error-prone when sharing state. 2. How does memory management work in iOS? iOS uses ARC (Automatic Reference Counting). Creating a class instance increases its reference count, and when no strong references remain, memory deallocates automatically. Developers must understand strong reference cycles, espe...