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

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1. What is the primary function of the `UICollectionView` class in UIKit?

Option: To display a scrollable list of items.

Option: To create custom views.

Option: To display a grid or other custom layout of items.

Option: To manage navigation between view controllers.

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2. 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

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3. Which of the following is NOT a valid way to unwrap an optional in Swift?

Option: Optional binding (`if let`)

Option: Forced unwrapping (`!`)

Option: Nil-coalescing operator (`??`)

Option: Implicit unwrapping (`!`, used during declaration)

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4. 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

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

Option: `UITableViewDelegate`

Option: `UITableViewDataSource`

Option: `UITableViewCellDelegate`

Option: `UITableViewCellDataSource`

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6. What is the difference between a `class` and an `actor` in Swift?

Option: Actors are thread-safe by default, while classes are not.

Option: Actors can have mutable state, while classes cannot.

Option: Classes can inherit from other classes, while actors cannot.

Option: Both a) and c)

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7. 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()`

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

Option: enum

Option: struct

Option: class

Option: protocol

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

Option: To inject values from the environment into a view.

Option: To observe changes in an object's properties.

Option: To bind a view to a state variable.

Option: To create an animation.

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11. What is the difference between `lazy var` and a computed property in Swift?

Option: `lazy var` is calculated only once, while a computed property is recalculated every time it's accessed

Option: `lazy var` is a property, while a computed property is a method

Option: `lazy var` can store values, while a computed property cannot

Option: There is no difference; they are interchangeable

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12. What is the purpose of the `@UIApplicationDelegateAdaptor` property wrapper in SwiftUI?

Option: To create a delegate for a UIKit view controller

Option: To inject an environment object

Option: To adapt a SwiftUI app to use a UIApplicationDelegate

Option: To handle deep linking

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13. Which protocol is used to define the layout of cells in a `UICollectionView`?

Option: `UICollectionViewDelegate`

Option: `UICollectionViewDataSource`

Option: `UICollectionViewFlowLayout`

Option: `UICollectionViewDelegateFlowLayout`

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14. Which protocol is used to define the data source for a collection view (`UICollectionView`) in UIKit?

Option: `UICollectionViewDelegate`

Option: `UICollectionViewDataSource`

Option: `UICollectionViewFlowLayout`

Option: `UICollectionViewDelegateFlowLayout`

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15. 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.

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16. What is the purpose of the `Codable` protocol in Swift?

Option: To make a type conform to the Equatable protocol

Option: To enable a type to be encoded and decoded to and from external representations like JSON

Option: To define a custom operator

Option: To create a new data type

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

Option: `Just`

Option: `Future`

Option: `Deferred`

Option: `Empty`

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18. What is the difference between `UserDefaults` and `Keychain` for data storage in iOS?

Option: `UserDefaults` is secure, while `Keychain` is not.

Option: `Keychain` is used for storing sensitive data, while `UserDefaults` is used for storing simple preferences.

Option: `UserDefaults` is used for storing large amounts of data, while `Keychain` is used for storing small amounts of data.

Option: There is no difference; they are interchangeable.

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19. Which of these is NOT a valid HTTP method used in RESTful APIs?

Option: GET

Option: POST

Option: PUT

Option: SEND

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20. What is the purpose of a "PreviewProvider" in SwiftUI?

Option: To display a preview of a view in the Xcode canvas without running the app

Option: To provide default values for view properties

Option: To handle user interactions with a view

Option: To create animations

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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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