CrazyImageCompressor.swift

static func compressImage(image:UIImage) -> Data? {
        // Reducing file size to a 10th
        var actualHeight: CGFloat = image.size.height
        var actualWidth: CGFloat = image.size.width
        let maxHeight: CGFloat = 1136.0
        let maxWidth: CGFloat = 640.0
        var imgRatio: CGFloat = actualWidth/actualHeight
        let maxRatio: CGFloat = maxWidth/maxHeight
        var compressionQuality: CGFloat = 0.7
        
        if (actualHeight > maxHeight || actualWidth > maxWidth) {
            if(imgRatio < maxRatio) {
                //adjust width according to maxHeight
                imgRatio = maxHeight / actualHeight
                actualWidth = imgRatio * actualWidth
                actualHeight = maxHeight
            }
            else if(imgRatio > maxRatio) {
                //adjust height according to maxWidth
                imgRatio = maxWidth / actualWidth
                actualHeight = imgRatio * actualHeight
                actualWidth = maxWidth
            }
            else {
                actualHeight = maxHeight
                actualWidth = maxWidth
                compressionQuality = 1
            }
        }
        
        let rect = CGRect(x: 0.0, y: 0.0, width: actualWidth, height: actualHeight)
        UIGraphicsBeginImageContext(rect.size)
        image.draw(in: rect)
        guard let img = UIGraphicsGetImageFromCurrentImageContext() else { return nil }
        let imageData = UIImageJPEGRepresentation(img, compressionQuality)
        UIGraphicsEndImageContext()
        return imageData
    }