SwiftUI Gestures Quiz

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 transient state during a gesture.

A method to define new gestures.

A built-in animation modifier.

A property wrapper for handling tap gestures.

None

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

To combine multiple gestures.

To handle updates during the gesture’s progress.

To detect the end of a gesture.

To detect the start of a gesture.

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?

combined()

sequenced()

simultaneously()

exclusively()

None

What does the predictedEndLocation property in DragGesture.Value represent?

The current location of the drag.

The initial location of the drag.

The direction of the drag.

The predicted final location based on the drag velocity.

None

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

Use the sequenced() modifier.

Apply the sequentially() modifier.

Use the onEnded() callback.

Apply the combined() modifier.

None

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

To detect two gestures simultaneously.

To replace one gesture with another.

To apply multiple gestures one after another.

To disable gesture detection.

None

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

Use the exclusive() modifier.

Use the simultaneously() modifier.

Use the combined() modifier.

Use the sequenced() modifier.

None

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

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

The total duration of the gesture.

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.

Enable the cancelOnDrag parameter.

Apply the offset() modifier.

Use the maximumDistance parameter in LongPressGesture.

None

11.

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

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

Apply a rotationEffect() modifier.

Use a TapGesture recognizer.

Use a frame() modifier.

None

12.

What does the translation property in DragGesture.Value represent?

The angle of rotation during a drag.

The duration of the drag.

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

The scale of magnification.

None

13.

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

updating

onChanged

onUpdate

onEnded

None

14.

What is a gesture in SwiftUI?

A method to handle user input through buttons.

A pre-defined animation effect.

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

A way to display text on the screen.

None

15.

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

RotationGesture

MagnificationGesture

DragGesture

TapGesture

None

16.

What does the MagnificationGesture recognizer detect in SwiftUI?

Taps

Long presses

Rotation movements

Pinching or zooming gestures

None

17.

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

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

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

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

onChanged is called after onEnded.

None

18.

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

RotationGesture

DragGesture

TapGesture

LongPressGesture

None

19.

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

It resets the gesture recognizer.

It adds a tap gesture.

It removes any gesture recognizer from the view.

It adds a drag gesture.

None

20.

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

By using LongPressGesture(delay:)

By using LongPressGesture(time:)

By using LongPressGesture(minimumDuration:)

By using LongPressGesture(duration:)

None

21.

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

DragGesture

MagnificationGesture

RotationGesture

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 starts.

To execute code when a gesture is canceled.

To execute code when a gesture changes.

None

23.

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

TapGesture(count: 2)

TapGesture(doubleTap: true)

TapGesture(tapCount: 2)

TapGesture(taps: 2)

None

24.

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

TapGesture

DragGesture

MagnificationGesture

LongPressGesture

None

25.

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

action()

animation()

transition()

gesture()

None

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