iOS Development IOS App Developer 3

Question 1

Which SwiftUI container arranges child views vertically?

Accepted Answer

VStack

Answer

HStack

Answer

ZStack

Answer

Group

Question 2

What is the purpose of the Codable protocol in Swift?

Accepted Answer

To enable encoding and decoding to formats like JSON

Answer

To make a type thread-safe

Answer

To enable UI animations

Answer

To handle Core Data migrations

Question 3

In MVVM architecture, what is the primary responsibility of the ViewModel?

Accepted Answer

Holding presentation logic and state for the view

Answer

Rendering pixels to the screen

Answer

Managing the database schema

Answer

Configuring the build settings

Question 4

Which Xcode tool helps you detect memory leaks and performance issues at runtime?

Accepted Answer

Instruments

Answer

Interface Builder

Answer

Simulator

Answer

Asset Catalog

Question 5

What does the @Published property wrapper require its enclosing type to conform to?

Accepted Answer

ObservableObject

Answer

Codable

Answer

Identifiable

Answer

Hashable

Question 6

Which method is called when a view controller's view is about to appear on screen?

Accepted Answer

viewWillAppear

Answer

viewDidLoad

Answer

loadView

Answer

didReceiveMemoryWarning

Question 7

What is the recommended way to persist a small amount of user preference data, like a toggle setting?

Accepted Answer

UserDefaults

Answer

Core Data

Answer

A remote server

Answer

URLSession cache