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

@State declares a view-owned mutable source of truth for a value type.

Question 2

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

Accepted Answer

numberOfRowsInSection

Answer

tableView(_:numberOfRowsInSection:) returns the row count for a given section.

Question 3

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

Accepted Answer

A background thread

Answer

URLSession delivers completion handlers on a background queue by default, so UI updates must be dispatched to main.

Question 4

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

Accepted Answer

async

Answer

The async keyword marks a function that can suspend and be awaited.

Question 5

What does ARC stand for in iOS memory management?

Accepted Answer

Automatic Reference Counting

Answer

Automatic Reference Counting tracks and frees objects when no strong references remain.

iOS Development Practice Test