Swift skill quiz for certificate: Boost Resume and LinkedIn Profile

Enhance your career with our free Swift skill Quiz. Perfect for boosting your resume and LinkedIn profile, this comprehensive quiz covers essential Swift iOS app Development skills.

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Swift Skill Exam

1 / 20

1. Which API allows you to fetch data from a remote server in an iOS app?

Option: CoreData

Option: UserDefaults

Option: URLSession

Option: Grand Central Dispatch

2 / 20

2. What is the purpose of the `DispatchQueue.global()` method?

Option: To get the main queue for UI updates.

Option: To create a serial queue for synchronous tasks.

Option: To get a global concurrent queue for background tasks.

Option: To cancel all operations in a queue.

3 / 20

3. Which of the following is NOT a common state management approach in SwiftUI?

Option: @State

Option: @ObservedObject

Option: @EnvironmentObject

Option: @AppStorage

4 / 20

4. What is the difference between a `Combine` `Publisher` and a `Subscriber`?

Option: A `Publisher` emits values, while a `Subscriber` receives them.

Option: A `Publisher` is a protocol, while a `Subscriber` is a class.

Option: A `Publisher` can have multiple subscribers, while a `Subscriber` can only subscribe to one publisher.

Option: All of the above.

5 / 20

5. Which of the following is NOT a valid way to create a Combine publisher in Swift?

Option: `Just`

Option: `Future`

Option: `Deferred`

Option: `Empty`

6 / 20

6. Which framework provides APIs for interacting with the HealthKit data store in iOS?

Option: HealthKitUI

Option: HealthKit

Option: CoreMotion

Option: CloudKit

7 / 20

7. In Swift, which keyword is used to define an enumeration?

Option: enum

Option: struct

Option: class

Option: protocol

8 / 20

8. Which of these protocols is primarily responsible for providing data to a `UITableView` in UIKit?

Option: `UITableViewDelegate`

Option: `UITableViewDataSource`

Option: `UITableViewCellDelegate`

Option: `UITableViewCellDataSource`

9 / 20

9. Which type of notification is triggered by the app itself, rather than being sent from a server?

Option: Push notification

Option: Local notification

Option: Silent notification

Option: Background notification

10 / 20

10. Which method is called when a view is about to appear on the screen in a `UIViewController`'s lifecycle?

Option: `viewDidLoad()`

Option: `viewWillAppear()`

Option: `viewDidAppear()`

Option: `viewDidLayoutSubviews()`

11 / 20

11. Which of the following is NOT a valid way to handle errors in Swift?

Option: Throwing an error using the `throw` keyword

Option: Using a `do-catch` block

Option: Returning an optional value

Option: Ignoring the error

12 / 20

12. Which of the following is NOT a common way to handle asynchronous operations in Swift?

Option: Completion handlers

Option: Promises

Option: Async/Await

Option: Semaphores

13 / 20

13. Which design pattern is commonly used to handle the navigation flow between screens in iOS apps?

Option: Singleton

Option: Observer

Option: Coordinator

Option: Factory

14 / 20

14. What is the purpose of the `@Environment` property wrapper in SwiftUI?

Option: To observe changes to an object's properties

Option: To access system-wide settings and preferences within a SwiftUI view

Option: To inject dependencies into a SwiftUI view

Option: To create animations

15 / 20

15. Which of the following states is NOT part of the standard iOS app lifecycle?

Option: Not running

Option: Inactive

Option: Active

Option: Suspended

16 / 20

16. What is the purpose of the `@Published` property wrapper in SwiftUI?

Option: To create a binding to a value

Option: To inject an environment object

Option: To publish changes to a property, triggering UI updates

Option: To declare a constant

17 / 20

17. What is the purpose of the `@escaping` attribute for a closure in Swift?

Option: To indicate that the closure will be executed immediately

Option: To indicate that the closure may outlive the function it is passed to

Option: To indicate that the closure can only be called once

Option: To indicate that the closure is optional

18 / 20

18. What is the purpose of the `deinit` method in a Swift class?

Option: To initialize the class

Option: To deallocate resources held by the class

Option: To handle user interactions

Option: To perform network requests

19 / 20

19. What is the difference between `let` and `var` when declaring properties in Swift?

Option: `let` declares a constant, while `var` declares a variable.

Option: `let` declares a variable, while `var` declares a constant.

Option: `let` is used for reference types, while `var` is used for value types.

Option: There is no difference; they are interchangeable.

20 / 20

20. What is the purpose of the `@StateObject` property wrapper in SwiftUI?

Option: To inject an object into the environment

Option: To create a binding to a state variable

Option: To create a reference object that is owned by the view and persists across updates

Option: To observe changes to an object owned by an external source

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Brief About Swift

Swift is a robust and intuitive programming language created by Apple for building apps for iOS, Mac, Apple TV and Apple Watch. It’s designed to give developers more freedom than ever. Swift is easy to use and open source, so anyone with an idea can create something incredible.

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