UISearchDisplayController - how to display search result with only by scope button selected but empty search string

Question

The UISearchDisplayController is very handy and implementing search is pretty straightforward.

However, I bump into problem when, in my app, I want to display search result with empty search string but selected scope button.

It seems like it's a must to enter some search string in order to get the search result table being initialized and displayed.

Is there any ways to display search result immediately after user has picked a scope but not entered search word yet?

Thanks Bill

Answer 1

I see that this question is a couple months old, but there are no answers. I'd be very interested to hear if anyone has any ideas on how this might be done.