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Cocoa Programming for OS X: The Big Nerd Ranch Guide
book

Cocoa Programming for OS X: The Big Nerd Ranch Guide

by Aaron Hillegass, Adam Preble, Nate Chandler
April 2015
Intermediate to advanced content levelIntermediate to advanced
556 pages
17h 47m
English
Big Nerd Ranch Guides
Content preview from Cocoa Programming for OS X: The Big Nerd Ranch Guide

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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Publisher Resources

ISBN: 9780134077130Purchase book