How to enable cancel button with UISearchBar?

This method worked in iOS7.

- (void)enableCancelButton:(UISearchBar *)searchBar
{
    for (UIView *view in searchBar.subviews)
    {
        for (id subview in view.subviews)
        {
            if ( [subview isKindOfClass:[UIButton class]] )
            {
                [subview setEnabled:YES];
                NSLog(@"enableCancelButton");
                return;
            }
        }
    }
}

(Also be sure to call it anywhere after [_searchBar resignFirstResponder] is used.)