- (UIImage*)scaleFromImage:(UIImage*)image scaledToSize:(CGSize)newSize

 CGSize imageSize = image.size;

 CGFloat width = imageSize.width;

 CGFloat height = imageSize.height;

     

 if (width <= newSize.width && height <= newSize.height){

  return image;

 }

     

 if (width == 0 || height == 0){

  return image;

 }

     

 CGFloat widthFactor = newSize.width / width;

 CGFloat heightFactor = newSize.height / height;

 CGFloat scaleFactor = (widthFactor<heightFactor?widthFactor:heightFactor);

     

 CGFloat scaledWidth = width * scaleFactor;

 CGFloat scaledHeight = height * scaleFactor;

 CGSize targetSize = CGSizeMake(scaledWidth,scaledHeight);

     

    UIGraphicsBeginImageContext(targetSize);

    [image drawInRect:CGRectMake(0,0,scaledWidth,scaledHeight)];

    UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return newImage;