setRightBarButtonItems:animated: crash

Question

I called

[self.navigationItem setRightBarButtonItems:nil animated:YES];

to hide the buttons during refresh operations

Sometimes I caught an exception saying

*** setObjectForKey: object cannot be nil (key: kUINavigationBarAnimationRightViews)

Answer 1

Previously the rightBarButtonItems array contained an item with a custom view - a UISearchBar being a firstResponder.

Calling the following line of code caused the crash

[self.navigationItem setRightBarButtonItems:nil animated:YES];

The solution

Simply calling

self.searchBar resignFirstResponder];

solved the issue