Warp image transformation

let cropViewController = DDPerspectiveTransformViewController() 
cropViewController.delegate = self 
cropViewController.image = image
navigationController?.pushViewController(cropViewController, animated: true)

func perspectiveTransformingDidFinish(controller: DDPerspectiveTransformViewController, croppedImage: UIImage)
func perspectiveTransformingDidCancel(controller: DDPerspectiveTransformViewController)

weak var delegate: DDPerspectiveTransformProtocol?
var image: UIImage? // The image for cropping
var padding: CGFloat? // Minimum padding value for all sides
var paddingWidth: CGFloat? // Minimum padding value for left and right sides
var paddingHeight: CGFloat? // Minimum padding value for top and bottom sides
var boxLineColor: UIColor? // The color of box lines
var boxLineWidth: CGFloat? // The width of box lines
var pointSize: CGSize? // The size of checkpoint
var pointColor: UIColor? // The color of checkpoint
var pointImage: UIImage? // The image of checkpoint

func cropAction()
func cancelAction()