We can do this two ways:
// version 1: [self.searchBar becomeFirstResponder]; // version 2: [self.searchDisplayController setActive:YES animated:YES];
The benefit of version 2 is that if we perform it “in vision”, we can use the animated option and make it look all swish.
Version 2 of course also has a reverse with which we can deactivate the controller:
[self.searchDisplayController setActive:NO animated:YES];
Note that this will not affect the UISearchBar associated with the search display controller; you need to deal with that separately.