Why?

I finally realised that [UtilFunctions colorToHex:color] isn't as elegant as a category on NSColor.

Usage

Using a hexadecimal color to create an NSColor:

@try {
    // Both shorthand and full forms of hexadecimal colours are accepted
    [colorWell setColor:[NSColor colorWithHex:@"#F00"]];
    [colorWell setColor:[NSColor colorWithHex:@"#Ff0000"]];
}
@catch (NSException *exception) {
    NSLog(@"%@", [exception description]);
}

It'll throw an exception if one attempts to use a string that is not 3 or 6 characters in length, excluding the hash.

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Getting the hexadecimal representation of a given NSColor:

NSString *hexColor = [color hexColor]

More Information

See this blog post: Extracting hex value from NSColor. Get this & more useful Cocoa Categories here: Cocoa Categories;