UIDragInteraction / UIDropItem get frame of preview - objective-c

Question

Currently I’m trying to get the frame of my drag/drop interaction object preview view. I can get the position of my finger thanks to:
- (CGPoint)locationInView:(UIView *)view;
I’ve searched through everything and can’t find a way to access the preview view object, or a frame reference. Has anyone figured this out?

Answer 1

Figured this one out - I found out there's a method called after the actual drop function that provides a UITargetedDragPreview object. So my logic is to store the drop session and interaction, then call my "update" function when this preview function has been called.
First, I create some variables for future use:
CGRect destinationFrame; // destination frame.
UIDropInteraction *storedInteraction; // stored interaction.
id <UIDropSession> storedSession; // stored session.
- (UITargetedDragPreview *)dropInteraction:(UIDropInteraction *)interaction previewForDroppingItem:(UIDragItem *)item withDefault:(UITargetedDragPreview *)defaultPreview {
if (!item.localObject) { return nil; }
CGPoint center = defaultPreview.target.center;
CGPoint converted = [defaultPreview.target.container convertPoint:center toView:<TARGETVIEW>];
CGPoint origin = CGPointMake(converted.x - (defaultPreview.view.frame.size.width / 2), converted.y - (defaultPreview.view.frame.size.height / 2));
self->destinationFrame = CGRectMake(origin.x, origin.y, defaultPreview.view.frame.size.width, defaultPreview.view.frame.size.height);
if (self->storedSession && self->storedInteraction) {
[self performDropWithInteraction:self->storedInteraction session:self->storedSession];
}
return nil;
}
- (void)dropInteraction:(UIDropInteraction *)interaction performDrop:(id<UIDropSession>)session {
self->storedInteraction = interaction;
self->storedSession = session;
}
- (void)performDropWithInteraction:(UIDropInteraction *)interaction session:(id<UIDropSession>)session {
// this where I will perform my actual drop, I get the frame with:
// self->destinationFrame.
}