I can make a custom drag view during drag-and-drop like so:
let d = UIDragItem(itemProvider: itemProvider)
d.previewProvider = { UIDragPreview(view: imageView) }
But then if my imageView is 'too big', iOS will resize it down to something it thinks is better. But, it's wrong. Anybody know how to prevent this? The imageView I give it has the exact draggable size that I want...