How to compress image without quality loss using Objective C?

Compress image, without quality loss using Objective C code:

NSData *imageData1= nil;

imageData1 =UIImageJPEGRepresentation([self compressForUpload:self.imageView.image scale:1.0], 0.8);

-(UIImage *)compressForUpload:(UIImage *)original scale:(CGFloat)scale

{

    CGSize originalSize = original.size;

    CGSize newSize = CGSizeMake(originalSize.width  *scale, originalSize.height  *scale);

    

    UIGraphicsBeginImageContext(newSize);

    [original drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];

    UIImage* compressedImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    

    return compressedImage;

}