How do I convert a UIColor to a hexadecimal string?

Question

I have a project where I need to store the RGBA values of a UIColor in a database as an 8-character hexadecimal string. For example, [UIColor blueColor] would be @\"0000FFFF\".

Answer 1

Here it goes. Returns a NSString (e.g. ffa5678) with a hexadecimal value of the color.

- (NSString *)hexStringFromColor:(UIColor *)color
{
    const CGFloat *components = CGColorGetComponents(color.CGColor);

    CGFloat r = components[0];
    CGFloat g = components[1];
    CGFloat b = components[2];

    return [NSString stringWithFormat:@"%02lX%02lX%02lX",
            lroundf(r * 255),
            lroundf(g * 255),
            lroundf(b * 255)];
}