iOS Development IOS App Developer 5

Question 1

What does the await keyword do at a call site in Swift concurrency?

Accepted Answer

Marks a potential suspension point

Answer

await marks a point where the function may suspend until the async work completes.

Question 2

Which protocol must a type conform to so SwiftUI's ForEach can uniquely identify its items without an explicit id?

Accepted Answer

Identifiable

Answer

Identifiable provides a stable id property that ForEach uses to track items.

Question 3

What is the role of GeometryReader in SwiftUI?

Accepted Answer

To access the size and coordinate space of its container

Answer

GeometryReader gives access to the proposed size and coordinate space for adaptive layouts.

Question 4

Which approach should you use to schedule repeated background work like data refresh on iOS?

Accepted Answer

BackgroundTasks framework

Answer

The BackgroundTasks framework lets the system schedule app refresh and processing tasks efficiently.

Question 5

What is the purpose of a delegate pattern in UIKit?

Accepted Answer

To allow one object to act on behalf of, or respond to, another

Answer

Delegation lets one object hand off responsibilities or callbacks to another conforming object.

iOS Development Practice Test