Saves any images found in the specified view or any of its subviews. Images are saved in the application's Documents directory.

StealImages.swift

    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)

        flightView.hidden = false
        stealImagesFromView(view)
    }

    private func stealImagesFromView(view: UIView) {
        let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
        let documentsDirectory = paths.first!

        for subview in view.subviews {
            if let imageView = subview as? UIImageView {
                if let image = imageView.image {
                    let filename = "image \(NSDate.timeIntervalSinceReferenceDate()).png"
                    let path = documentsDirectory + "/" + filename
                    let imageData = UIImagePNGRepresentation(image)
                    imageData?.writeToFile(path, atomically: true)
                }
            }
            stealImagesFromView(subview)
        }

        struct TokenHolder {
            static var token: dispatch_once_t = 0;
        }
        dispatch_once(&TokenHolder.token) { () -> Void in
            print("Stolen images can be found here: \(documentsDirectory)")
        }
    }