extension UIImage {
    func resized(to maxSize: CGFloat) -> UIImage? {
        var size = self.size
        if size.width <= maxSize && size.height <= maxSize {
            return self
        }
        let scaleFactor = maxSize / max(size.width, size.height)
        size.width *= scaleFactor
        size.height *= scaleFactor
        
        UIGraphicsBeginImageContext(size)
        self.draw(in: CGRect(origin: .zero, size: size))
        let newImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        
        return newImage
    }
}