An NSCustomImageRep object uses a delegate object to render an image. When called upon to produce an image, it sends a message to its delegate to do the actual drawing. You can use this class to support custom image formats without going to the trouble of subclassing NSImageRep directly.
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init(draw: Selector, delegate: Any)Returns an NSCustomImageRep object initialized with the specified delegate information.
init(size: NSSize, flipped: Bool, drawingHandler: @escaping (NSRect) -> Bool)Initializes an image representation of the specified size and flipped status, using a Block to draw its content.
var drawingHandler: ((NSRect) -> Bool)?The destination rectangle of the drawing handler Block.
var delegate: AnyObject?the delegate object that renders the image for the receiver.
var drawSelector: Selector?The selector for the delegate's drawing method.