Change image color objective c

- (UIImage *)image:(UIImage *)image WithTint:(UIColor *)tintColor
{
    // Begin drawing
    CGRect aRect = CGRectMake(0.f, 0.f, image.size.width, image.size.height);
    CGImageRef alphaMask;

    //
    // Compute mask flipping image
    //
    {
        UIGraphicsBeginImageContext(aRect.size);
        CGContextRef c = UIGraphicsGetCurrentContext();

        // draw image
        CGContextTranslateCTM(c, 0, aRect.size.height);
        CGContextScaleCTM(c, 1.0, -1.0);
        [image drawInRect: aRect];

        alphaMask = CGBitmapContextCreateImage(c);

        UIGraphicsEndImageContext();
    }

    //
    UIGraphicsBeginImageContext(aRect.size);

    // Get the graphic context
    CGContextRef c = UIGraphicsGetCurrentContext();

    // Draw the image
    [image drawInRect:aRect];

    // Mask
    CGContextClipToMask(c, aRect, alphaMask);

    // Set the fill color space
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextSetFillColorSpace(c, colorSpace);

    // Set the fill color
    CGContextSetFillColorWithColor(c, tintColor.CGColor);

    UIRectFillUsingBlendMode(aRect, kCGBlendModeNormal);

    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    // Release memory
    CGColorSpaceRelease(colorSpace);
    CGImageRelease(alphaMask);

    return img;
}