Divide image in array of images with swift

Question

I\'m trying to divide an image to create 16 out of it (in a matrix). I\'m using swift 2.1. Here\'s the code:

let cellSize = Int(originalImage.size.height) /          


        

Answer 1

I've used this to slice an image into a matrix. The matrix is represented as a 1D array.

func snapshotImage(image: UIImage, rect: CGRect) -> UIImage {
        var imageRect: CGRect! = rect

        if image.scale > 1.0 {
            imageRect = CGRect(origin: CGPoint(x: rect.origin.x * image.scale, y: rect.origin.y * image.scale), size: CGSize(width: rect.size.width * image.scale, height: rect.size.height * image.scale))
        }


        let imageRef: CGImage = image.cgImage!.cropping(to: imageRect)!
        let result: UIImage = UIImage(cgImage: imageRef, scale: image.scale, orientation: image.imageOrientation)
        return result
    }

    func sliceImage(image: UIImage, size: CGSize) -> [UIImage] {
        var slices: [UIImage] = [UIImage]()
        var rect = CGRect(x: 0.0, y: 0.0, width: size.width, height: size.height)


        var y: Float = 0.0
        let width: Int = Int(image.size.width / size.width)
        let height: Int = Int(image.size.height / size.height)

        for _ in 0...height {
            var x: Float = 0.0

            for _ in 0...width {
                rect.origin.x = CGFloat(x);
                slices.append(self.snapshotImage(image: image, rect: rect))

                x += Float(size.width)
            }

            y += Float(size.height)
            rect.origin.y = CGFloat(y)
        }

        return slices
    }