How to COMBINE / MERGE two images into ONE image in iOS

// combine/ merge two images into one image

- (UIImage*)imageByCombiningImage:(UIImage*)firstImage withImage:(UIImage*)secondImage

{

    UIImage *image = nil;

    

    CGSize newImageSize = CGSizeMake(MAX(firstImage.size.width, secondImage.size.width), MAX(firstImage.size.height, secondImage.size.height));

    if (UIGraphicsBeginImageContextWithOptions != NULL) {

        UIGraphicsBeginImageContextWithOptions(newImageSize, NO, [[UIScreen mainScreen] scale]);

    } else {

        UIGraphicsBeginImageContext(newImageSize);

    }

    [firstImage drawAtPoint:CGPointMake(roundf((newImageSize.width-firstImage.size.width)/2),

                                        roundf((newImageSize.height-firstImage.size.height)/2))];

    [secondImage drawAtPoint:CGPointMake(roundf((newImageSize.width-secondImage.size.width)/2),

                                         roundf((newImageSize.height-secondImage.size.height)/2))];

    image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    

    return image;

}