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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 conform to Encodable and Decodable

The type must be a String

The type must be an Int

The type must be a class

None

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

@AppStorage

@Published

@SceneStorage

@State

None

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

Use @State instead

Convert it to JSON format

Encode it as Data

Store it as a String

None

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

By using JSONDecoder.decode()

By using String.decode()

By using BinaryDecoder.decode()

By using DataDecoder.decode()

None

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

The data is saved in the cloud

The data is lost

The data persists and is restored upon app relaunch

The data is converted to a different format

None

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

@AppStorage

@SceneStorage

@Published

@State

None

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

The app reloads completely

The changes are ignored until the app restarts

The user interface updates to reflect the new data

It prompts the user for confirmation

None

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

Codable.encode()

Data.toJSON()

JSONEncoder.encode()

Base64Encoder.encode()

None

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

Sharing data between different apps

Storing user preferences

Persisting user settings

Retaining scene-specific states

None

10.

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

The data will be saved in the cloud

The data will be lost for that specific scene

The app will crash

The data will be shared with other apps

None

11.

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

To handle complex text formatting

To reduce app size

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

To enable text sharing between users

None

12.

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

Core Data

App Groups

User Authentication

Remote Database

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?

@EnvironmentObject

@SceneStorage

@StateObject

@AppStorage

None

14.

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

To manage user authentication

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

To store images in the app’s memory

To store large amounts of data across app restarts

None

15.

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

It does not share data between scenes

It only works on macOS

It is not available in SwiftUI

It cannot store any data

None

16.

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

@Binding

@AppStorage

@SceneStorage

@State

None

17.

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

It speeds up network operations

Each window can have its own isolated copy of the data

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 saving them to the file system

By storing them directly

By converting them to a supported type using Codable

By using the @State property wrapper

None

19.

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

Data is sent to a remote server

Data is saved only when the app is closed

Data is immediately saved

Data is deleted

None

20.

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

Data is not preserved after termination

Data is automatically saved to disk and restored upon relaunch

Data is manually backed up by the user

Data is stored in a remote database

None

21.

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

Any type that conforms to the Codable protocol

Only custom structs and classes

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 using cloud storage

By using @SceneStorage

By enabling Bluetooth sharing

By setting up an App Group

None

23.

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

@AppStorage can only be used in macOS apps

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

@SceneStorage is faster than @AppStorage

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

None

24.

How is data stored using the @AppStorage property wrapper?

In UserDefaults

Using Core Data

On a remote server

In local files

None

25.

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

Large files

Small amounts of data for individual scenes

Static data only

Data shared between multiple apps

None

26.

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

@State

@SceneStorage

@AppStorage

@Environment

None

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