On Mar 30, 2012, at 8:31 PM, Peter Teeson <pteeson@me.com> wrote:

In a Document app I have an NSMatrix. I only need to override drawRect. Rather than using a sub-class, which seems overkill to me, I decided to try a Category instead.

Categories don't override, they replace. As has already been noted , this means every NSMatrix instance in your app now uses your drawRect:. But it also means you can't have two instances of NSMatrix that had different drawing and you can no longer access the original implementation. -- David Duncan _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/site_archiver%40lists.appl... This email sent to site_archiver@lists.apple.com