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First of all, you need to connect the 'delegate' wiring of your UISearchBar in the Interface Builder to your ViewController.

Then in the header file for your view controller, on the line that starts with @interface, after the base class but before the { you should add <UISearchBarDelegate> (or just put UISearchBarDelegate between the existing < and > if there are any). What you're doing is telling the view controller class that it supports the protocol for being a UISearchBarDelegate.

Then you need to implement some methods in your view controller main file. Which ones you implement is up to you, but here's what I had implemented (in an app that is currently in review for the AppStore):

• searchBarTextDidBeginEditing: will be called when the user starts editing the search bar text
• searchBarTextDidEndEditing: will be called when the user finishes editing the search bar text
• searchBar:textDidChange: will be called when the user changes the text in the search bar (every key stroke)
• searchBarCancelButtonClicked: will be called when the cancel button in the search bar is pressed
• searchBarSearchButtonClicked: will be called when the search button in the search bar is clicked.