func withColor(_ color: UIColor) -> UIImage {

    UIGraphicsBeginImageContextWithOptions(size, false, scale)
    guard let ctx = UIGraphicsGetCurrentContext(), let cgImage = cgImage else { return self }
    color.setFill()
    ctx.translateBy(x: 0, y: size.height)
    ctx.scaleBy(x: 1.0, y: -1.0)
    ctx.clip(to: CGRect(x: 0, y: 0, width: size.width, height: size.height), mask: cgImage)
    ctx.fill(CGRect(x: 0, y: 0, width: size.width, height: size.height))
    guard let colored = UIGraphicsGetImageFromCurrentImageContext() else { return self }
    UIGraphicsEndImageContext()
    return colored
}