Swift resizeImage function

gistfile1.txt

    func resizeImage(image: UIImage, newSize: CGSize) -> UIImage {
        let imageSize = image.size
        let width = imageSize.width
        let height = imageSize.height
        
        let widthFactor = newSize.width/width
        let heightFactor = newSize.height/height
        let scaledFactor = (widthFactor < heightFactor) ? widthFactor : heightFactor
        
        let scaledWidth = width * scaledFactor
        let scaledHeight = height * scaledFactor
        let targetSize = CGSize(width: scaledWidth, height: scaledHeight)
        
        UIGraphicsBeginImageContext(targetSize)
        image.draw(in: CGRect(x: 0, y: 0, width: scaledWidth, height: scaledHeight))
        let newImage = UIGraphicsGetImageFromCurrentImageContext()
        
        return newImage!
    }