Make DieView a Drag Destination

There are several parts to being a drag destination. First, you need to declare your view a destination for the dragging of certain types. NSView has a method for this purpose: 

func registerForDraggedTypes(newTypes: [AnyObject])

You typically call this method in your initWithFrame: method.

Then you need to implement six methods. (Yes, six!) All six methods have the same argument: an object that conforms to the NSDraggingInfo protocol. That object provides the dragging pasteboard. The six methods are invoked as follows:

  1. As the image is dragged into the destination, the destination is sent a draggingEntered(_:) message. Often, the destination view updates its appearance. For example, it ...

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