Re: Implementing NSFastEnumeration

On Thu, Oct 1, 2009 at 9:43 AM, Gerd Knops <[email protected]> wrote:
> AFAIK subclassing class clusters doesn't work, which is why I think they are
> a poor design.

It is certainly possible to subclass a class cluster.  Sometimes it's
not easy.  A common strategy is to implement the subclass with an ivar
of the superclass type, like so:

@interface MyAttributedString : NSAttributedString
{
@private
  NSAttributedString *originalString;
}

@end

And then implement the documented primitive methods in terms of this ivar.

--Kyle Sluder