iOS Development IOS App Developer 4

Question 1

Which SwiftUI modifier is used to respond when a view appears?

Accepted Answer

.onAppear

Answer

.onTap

Answer

.onChange

Answer

.task

Question 2

In Swift, what is an optional?

Accepted Answer

A type that may hold a value or be nil

Answer

A type that is always non-nil

Answer

A reference-only type

Answer

A compile-time constant

Question 3

Which framework is Apple's modern persistence solution layered on top of Core Data, introduced for SwiftUI?

Accepted Answer

SwiftData

Answer

Realm

Answer

SQLite.swift

Answer

Firebase

Question 4

What is the main benefit of using dependency injection in an iOS app?

Accepted Answer

Improved testability and decoupling

Answer

Faster compile times

Answer

Smaller binary size

Answer

Automatic UI layout

Question 5

Which actor type in Swift concurrency guarantees its code runs on the main thread?

Accepted Answer

MainActor

Answer

GlobalActor

Answer

TaskActor

Answer

UIActor

Question 6

What does a segue represent in a UIKit storyboard?

Accepted Answer

A transition between view controllers

Answer

A network request

Answer

A data model

Answer

A unit test case

Question 7

Which value type in Swift is preferred for modeling simple data and benefits from copy semantics?

Accepted Answer

struct

Answer

class

Answer

actor

Answer

protocol