This is a demo for adding dragging and droppings support to NSImageView, based on Apple's sample code "CocoaDragAndDrop".
Apple's "CocoaDragAndDrop" sample shows you how to drag image from Finder to an NSImageView and how to drag an image between NSImageViews, but it doesn't show you how to drag from NSImageView to Finder and save the image.
I added some code to "DragDropImageView" to show you how to do this. Also, the two properties: allowDrag and allowDrop are available which control if the NSImageView can drag or drop the image.