Return a subimage from a UIImage

Question

I want to grab a subimage from a UIImage. I\'ve looked around for a similar question, to no avail.

I know the range of pixels I want to grab - how can I return th

Answer 1

In Swift 4, taking into account screen scale (otherwise your new image will be too large):

    let img = UIImage(named: "existingImage")!
    let scale = UIScreen.main.scale
    let dy: CGFloat = 6 * scale // say you want 6pt from bottom
    let area = CGRect(x: 0, y: img.size.height * scale - dy, width: img.size.width * scale, height: dy)
    let crop = img.cgImage!.cropping(to: area)!
    let subImage = UIImage(cgImage: crop, scale: scale, orientation:.up)