UISearchBar not responding to delegate methods

1. Double-check your connections. I know you think they're right, but it's very easy to mess up and would cause exactly the kind of problem you're seeing.

2. Double-check the spelling on your delegate methods.

3. If neither of those turn anything up, add this to your view controller:

- (BOOL)respondsToSelector:(SEL)sel {
 NSLog(@"Queried about %@", NSStringFromSelector(sel));
 return [super respondsToSelector:sel];
}

That'll tell you every time another class tries to check which methods your class supports. UISearchBar uses this to check if your controller implements the delegate methods. If you don't see any searchBar:* method checks in your Console pane, the connection between the search bar and your controller is being broken somehow; if you do, it's looking for the methods but not seeing them for some reason.

Then there's something wrong with the connection. To confirm that, we'll make the connection manually. Create an outlet in your view controller's header file:

@interface MyViewController : UIViewController <UISearchBarDelegate> {
 ...
 IBOutlet UISearchBar * searchBar;
 ...
}
...

In Interface Builder, connect your search bar to the new searchBar outlet.

Back in Xcode, go to the implementation of your viewDidLoad method and add this line:

 searchBar.delegate = self;

This will create the connection manually.

Save, build, and test. Did that help?

Are you making your connections to File's Owner, or something else?

Strange. That "undefined key" error basically means that it couldn't find your searchBar property when it had an actual object in front of it.

Okay, next dumb question. Are you sure you're actually allocating an object of your view controller class, or are you allocating a generic UIViewController? (This isn't about what class File's Owner is set to--the view controller object is created somewhere else, either in another class or in another nib.)

Are you replacing the first tab view or the second one (or a new one)?

If you're replacing the Second, open up MainWindow.xib, double-click Tab Bar Controller, click the Second button, and make sure the Class is your view controller class.

Which one? The two are wired up differently.