iOS Development IOS App Developer 2

Question 1

Which property wrapper in SwiftUI creates a source of truth for a value type owned by the current view?

Accepted Answer

@State

Answer

@Binding

Answer

@Environment

Answer

@Published

Question 2

In a UITableView, which method must you implement to provide the number of rows in a section?

Accepted Answer

numberOfRowsInSection

Answer

cellForRowAt

Answer

didSelectRowAt

Answer

heightForRowAt

Question 3

What is the default thread on which URLSession completion handlers are called?

Accepted Answer

A background thread

Answer

The main thread

Answer

The thread that started the task

Answer

A serial dispatch queue you specify

Question 4

Which keyword marks a Swift function that can suspend and resume with structured concurrency?

Accepted Answer

async

Answer

throws

Answer

lazy

Answer

defer

Question 5

What does ARC stand for in iOS memory management?

Accepted Answer

Automatic Reference Counting

Answer

Automatic Resource Caching

Answer

Asynchronous Runtime Closure

Answer

Allocated Region Collector

Question 6

To avoid a retain cycle in a closure capturing self, which capture list is commonly used?

Accepted Answer

[weak self]

Answer

[strong self]

Answer

[copy self]

Answer

[mutable self]

Question 7

Which file declares an iOS app's permissions usage descriptions, like camera access?

Accepted Answer

Info.plist

Answer

AppDelegate.swift

Answer

Package.swift

Answer

Assets.xcassets