draw text over any image (pass additional parameters, so that text is not pixelated)

DrawTextOnImage

- (UIImage *)drawTextOnImage:(NSString *)text :(UIImage *)img {
    UIGraphicsBeginImageContextWithOptions(img.size, NO, [UIScreen mainScreen].scale);
    CGRect imageBoundaries = CGRectMake(0,0, img.size.width, img.size.height);
    [img drawInRect:imageBoundaries];
    
    imageBoundaries.origin.y = (imageBoundaries.size.height - 14) / 2 - 4;
    imageBoundaries = CGRectIntegral(imageBoundaries);
    imageBoundaries.size.height = 14;
    
    [[UIColor grayColor] set];
    
    [text drawInRect:imageBoundaries withFont:[UIFont boldSystemFontOfSize:14] lineBreakMode:NSLineBreakByTruncatingTail alignment:NSTextAlignmentCenter];
    
    UIImage *theImage=UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return theImage;
}

I am using this, but whatever I do, the end image is blurred.
Have you every had a similar experience?