dragInteraction(_:previewForCancelling:withDefault:)
Asks the delegate for the targeted drag item preview to show during the cancellation animation.
Declaration
optional func dragInteraction(_ interaction: UIDragInteraction, previewForCancelling item: UIDragItem, withDefault defaultPreview: UITargetedDragPreview) -> UITargetedDragPreview?Parameters
- interaction:
The interaction that called this method.
- item:
The drag item represented by the preview.
- defaultPreview:
A targeted drag preview provided by the system.
Return Value
The default preview provided by the system.
A targeted drag item preview you create.
The preview returned after moving to a new preview target (using the
defaultPreview’s retargetedPreview(with:) method).nilto fade the preview that is currently displayed to the user, which is the same behavior as not implementing this method.
Discussion
The system calls this method multiple times, once for each visible drag item.
When you return a preview, the system shows it during the cancellation animation in order to visually “move” the drag item to the location of the preview’s associated view.