Create ThumbnailImage

#pragma mark - Set thumbnailImage
-(UIImage*)setThumbnailFromImage:(UIImage *)image
{
    CGSize origImageSize = image.size;
    
    // The rectangle of the thumbnail
    CGRect newRect = CGRectMake(0, 0, 40, 40);
    
    // Figure out a scaling ratio to make sure we maintain the same aspect ratio
    float ratio = MAX(newRect.size.width / origImageSize.width,
                      newRect.size.height / origImageSize.height);
    
    // Creating a transparent bitmap context with a scaling factor
    // equal to that of the screen
    UIGraphicsBeginImageContextWithOptions(newRect.size, NO, .0);
    
    // Create a path that is rounded rectangle
    UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:newRect cornerRadius:5.0];
    
    // Make all subsequent drawing clip to this rounded rectangle.
    [path addClip];
    
    // Center the image in the thumbnail rectangle
    CGRect projectRect;
    projectRect.size.width = origImageSize.width * ratio;
    projectRect.size.height = origImageSize.height * ratio;
    projectRect.origin.x = (newRect.size.width - projectRect.size.width) / 2.0;
    projectRect.origin.y = (newRect.size.height - projectRect.size.height) / 2.0;
    
    // Draw the image on it
    [image drawInRect:projectRect];
    
    // Get the image from the image context, keep it as thumbnail
    UIImage *smallImage = UIGraphicsGetImageFromCurrentImageContext();
    
    // Clean up the image context resources
    UIGraphicsEndImageContext();
    return smallImage;
}