SwiftUI Gestures Quiz – Answertopia

Take this quiz to test your knowledge of gesture recognizers in SwiftUI, including detecting taps, double taps, pinching, rotation motions, and long presses.

What is @GestureState in SwiftUI?

A property wrapper for handling tap gestures.

A method to define new gestures.

A property wrapper for handling transient state during a gesture.

A built-in animation modifier.

None

What is the function of the onChanged callback in SwiftUI gesture recognizers?

To combine multiple gestures.

To detect the end of a gesture.

To detect the start of a gesture.

To handle updates during the gesture’s progress.

None

What is the result of using a @GestureState property with a drag gesture in SwiftUI?

The property disables the drag gesture.

The property remains unchanged.

The property changes only once at the end of the drag.

The property updates continuously during the drag and resets when the gesture ends.

None

Which SwiftUI modifier is used to detect exclusive gestures?

simultaneously()

exclusively()

combined()

sequenced()

None

What does the predictedEndLocation property in DragGesture.Value represent?

The predicted final location based on the drag velocity.

The initial location of the drag.

The current location of the drag.

The direction of the drag.

None

How can you make a gesture perform an action only after a different gesture completes?

Apply the combined() modifier.

Apply the sequentially() modifier.

Use the sequenced() modifier.

Use the onEnded() callback.

None

What is the purpose of the .simultaneously(with:) modifier in SwiftUI gestures?

To disable gesture detection.

To apply multiple gestures one after another.

To detect two gestures simultaneously.

To replace one gesture with another.

None

How do you compose multiple gestures to be detected in sequence?

Use the combined() modifier.

Use the sequenced() modifier.

Use the simultaneously() modifier.

Use the exclusive() modifier.

None

What does the updating callback provide in addition to the gesture value?

The total duration of the gesture.

A reference to a @GestureState property and a Transaction object.

A reference to the view’s parent.

The background color of the gesture target.

None

10.

How can you make a long press gesture cancel if the touch moves beyond a certain distance?

Set the gesture to cancel by default.

Apply the offset() modifier.

Use the maximumDistance parameter in LongPressGesture.

Enable the cancelOnDrag parameter.

None

11.

How can you make an image follow a drag gesture across the screen in SwiftUI?

Use a TapGesture recognizer.

Use a frame() modifier.

Apply a rotationEffect() modifier.

Apply an offset() modifier with a @GestureState property.

None

12.

What does the translation property in DragGesture.Value represent?

The total translation from the start to the current position of the drag.

The angle of rotation during a drag.

The duration of the drag.

The scale of magnification.

None

13.

Which callback is typically used to update a @GestureState property?

updating

onUpdate

onChanged

onEnded

None

14.

What is a gesture in SwiftUI?

A pre-defined animation effect.

A method to handle user input through buttons.

A way to display text on the screen.

An interaction between the user and the touch screen detected by the app.

None

15.

What type of gesture is used to detect a rotation motion in SwiftUI?

TapGesture

MagnificationGesture

DragGesture

RotationGesture

None

16.

What does the MagnificationGesture recognizer detect in SwiftUI?

Long presses

Taps

Pinching or zooming gestures

Rotation movements

None

17.

How does the onChanged callback differ from onEnded in gesture recognizers?

onChanged is used only for taps; onEnded is used for other gestures.

onChanged is called after onEnded.

onChanged is called when the gesture value changes; onEnded is called when the gesture ends.

onChanged is called when a gesture ends; onEnded is called when it begins.

None

18.

Which gesture recognizer allows you to detect and respond to motion across the display?

TapGesture

RotationGesture

LongPressGesture

DragGesture

None

19.

What happens when you use .gesture(nil) in SwiftUI?

It resets the gesture recognizer.

It adds a drag gesture.

It removes any gesture recognizer from the view.

It adds a tap gesture.

None

20.

How can you make a long press gesture in SwiftUI require a specific duration?

By using LongPressGesture(minimumDuration:)

By using LongPressGesture(time:)

By using LongPressGesture(duration:)

By using LongPressGesture(delay:)

None

21.

Which SwiftUI gesture recognizer is used to detect a pinch gesture?

RotationGesture

MagnificationGesture

DragGesture

LongPressGesture

None

22.

What is the purpose of the onEnded callback in gesture recognizers?

To execute code when a gesture ends.

To execute code when a gesture changes.

To execute code when a gesture is canceled.

To execute code when a gesture starts.

None

23.

How can you specify a double tap gesture using a TapGesture recognizer?

TapGesture(doubleTap: true)

TapGesture(count: 2)

TapGesture(taps: 2)

TapGesture(tapCount: 2)

None

24.

Which gesture recognizer is used to detect a single tap on a view in SwiftUI?

TapGesture

DragGesture

LongPressGesture

MagnificationGesture

None

25.

Which SwiftUI modifier is used to add gesture recognizers to a view?

action()

animation()

transition()

gesture()

None

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