--- On Tue, 7/29/08, Torsten Curdt <[EMAIL PROTECTED]> wrote:
> But wait ...this works OK for methods. But what about adding
> ivars?
>
> @interface MyClass (Private)
> {
> int myvar;
> }
>
> - (int) myvar;
>
> @end
>
> This gives a syntax error. Looking through some docs it
> seems I cannot
> add ivars through a category.
> So how can I have private ivars that don't show up in
> the interface?
You can't without hacks like putting a byte blob or pointer at the bottom of
your class and filling that with extra ivars. Apple does this in its frameworks
to maintain binary compatibility while still being able to change the structure
of a class. But unless backward binary compatibility is a concern for you, it's
easier just to use @private if the variables must be private rather than
protected.
Cheers,
Chuck
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