SwiftUI SwiftUI Gestures and Interactions 3

Question 1

Which protocol must a type conform to in order to be used with the `.draggable()` modifier?

Accepted Answer

Transferable

Answer

The Transferable protocol (iOS 16+) defines how a type can be converted to and from a transfer representation for drag-and-drop and copy-paste.

Question 2

Which modifier on a SwiftUI view receives dropped items in a drag-and-drop operation?

Accepted Answer

.dropDestination(for:action:)

Answer

.dropDestination(for:action:) is the modern iOS 16+ modifier that designates a view as a drop target for Transferable types.

Question 3

What happens to a `@GestureState` variable when the user lifts their finger and the gesture ends?

Accepted Answer

It resets to its initial value automatically

Answer

@GestureState automatically resets to the initial value declared at the property when the gesture ends, without any extra code.

Question 4

In SwiftUI, how do you make a view respond to hover events on macOS or iPadOS with pointer?

Accepted Answer

.onHover { isHovered in }

Answer

.onHover { isHovered in } provides a Bool indicating whether the pointer is currently hovering over the view.

Question 5

Which SwiftUI modifier adds a visual hover effect on supported devices without custom logic?

Accepted Answer

.hoverEffect()

Answer

.hoverEffect() applies a system-defined visual highlight effect when a pointer hovers over the view on supported platforms.

SwiftUI Practice Test