UIImage-from-color.swift

extension UIImage {
    class func imageFromColor(color: UIColor, size: CGSize=CGSize(width: 1, height: 1), scale: CGFloat) -> UIImage? {
        UIGraphicsBeginImageContextWithOptions(size, false, scale)
        color.setFill()
        UIRectFill(CGRect(origin: CGPoint.zero, size: size))
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }