iPhone: Hide UITableView search bar by default

I used the Interface Builder to create a table view, to which I added the library’s Search Bar and Search Display Controller to add search functionality. However, IB set it up so that the bar is visible at the top of the screen when the view is first displayed.

I’d like to know how to have the search bar be hidden by default but still scrollable with the table view (see Apple’s Mail application for an example). I’ve tried calling scrollRectToVisible:animated: in viewDidLoad to scroll the table view down, but to no avail. What’s the preferred way of hiding the search bar by default?

iPhone: Hide UITableView search bar by default