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SwiftUI Data Persistence Tutorial

Take this quiz to test your knowledge of persistent data storage in SwiftUI using the @AppStorage and @SceneStorage property wrappers.

What is required for a custom type to be stored using @AppStorage?

The type must be a String

The type must be a class

The type must conform to Encodable and Decodable

The type must be an Int

None

Which storage property wrapper would you use for saving user-selected settings in a SwiftUI app?

@Published

@SceneStorage

@State

@AppStorage

None

What should you do if you need to store a non-supported type using @AppStorage?

Store it as a String

Convert it to JSON format

Encode it as Data

Use @State instead

None

How can you decode a custom type stored as Data using @AppStorage?

By using DataDecoder.decode()

By using BinaryDecoder.decode()

By using String.decode()

By using JSONDecoder.decode()

None

What happens to the data stored using @AppStorage when the app is terminated?

The data is converted to a different format

The data persists and is restored upon app relaunch

The data is saved in the cloud

The data is lost

None

Which property wrapper should be used to store data that needs to persist between app sessions and be shared across different scenes?

@SceneStorage

@AppStorage

@Published

@State

None

How does @AppStorage affect the user interface when its stored value changes?

The changes are ignored until the app restarts

It prompts the user for confirmation

The app reloads completely

The user interface updates to reflect the new data

None

Which method is used to encode a custom type before storing it using @AppStorage?

Base64Encoder.encode()

Codable.encode()

JSONEncoder.encode()

Data.toJSON()

None

Which of the following is NOT a valid use case for @AppStorage?

Storing user preferences

Sharing data between different apps

Retaining scene-specific states

Persisting user settings

None

10.

What will happen if data stored using @SceneStorage is not restored correctly after an app restart?

The app will crash

The data will be lost for that specific scene

The data will be shared with other apps

The data will be saved in the cloud

None

11.

Why would you use @SceneStorage for a text input field in SwiftUI?

To reduce app size

To enable text sharing between users

To handle complex text formatting

To ensure the text persists through app closures in a specific scene

None

12.

What must be configured in Xcode to share data using @AppStorage across multiple apps?

Remote Database

Core Data

App Groups

User Authentication

None

13.

Which SwiftUI property wrapper should be used to store data that needs to be retained only for the duration of a specific scene?

@StateObject

@AppStorage

@EnvironmentObject

@SceneStorage

None

14.

What is the primary purpose of the @SceneStorage property wrapper in SwiftUI?

To store small amounts of data within the scope of individual app scenes

To manage user authentication

To store large amounts of data across app restarts

To store images in the app’s memory

None

15.

What is a key limitation of the @SceneStorage property wrapper?

It only works on macOS

It does not share data between scenes

It cannot store any data

It is not available in SwiftUI

None

16.

Which property wrapper would you use to store user preferences globally across the app?

@AppStorage

@State

@SceneStorage

@Binding

None

17.

What is the advantage of using @SceneStorage in a multi-window app?

Each window can have its own isolated copy of the data

It speeds up network operations

It requires no coding to implement

Data is shared across all windows automatically

None

18.

How can you store custom types using @AppStorage or @SceneStorage?

By converting them to a supported type using Codable

By storing them directly

By using the @State property wrapper

By saving them to the file system

None

19.

What happens to data stored with @AppStorage when the app moves to the background?

Data is deleted

Data is sent to a remote server

Data is immediately saved

Data is saved only when the app is closed

None

20.

How is data stored using @SceneStorage preserved when the app is terminated?

Data is not preserved after termination

Data is manually backed up by the user

Data is automatically saved to disk and restored upon relaunch

Data is stored in a remote database

None

21.

Which types of data can be directly stored using @AppStorage and @SceneStorage?

Only custom structs and classes

Any type that conforms to the Codable protocol

Bool, Int, Double, String, URL, and Data types

Only String and Int types

None

22.

How can you make data stored with @AppStorage shareable between multiple apps?

By enabling Bluetooth sharing

By setting up an App Group

By using @SceneStorage

By using cloud storage

None

23.

What is a key difference between @AppStorage and @SceneStorage in SwiftUI?

@AppStorage is for images, while @SceneStorage is for text

@AppStorage stores data globally, while @SceneStorage stores data per scene instance

@AppStorage can only be used in macOS apps

@SceneStorage is faster than @AppStorage

None

24.

How is data stored using the @AppStorage property wrapper?

Using Core Data

In UserDefaults

In local files

On a remote server

None

25.

What type of data does the @SceneStorage property wrapper store?

Large files

Static data only

Small amounts of data for individual scenes

Data shared between multiple apps

None

26.

Which SwiftUI property wrapper is used for data that is accessible throughout the entire app?

@SceneStorage

@State

@AppStorage

@Environment

None

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