Enable search button when empty text

gistfile1.m

- (void) enableSearchEmpty {
    UITextField *searchBarTextField = nil;
    for (UIView *subview in searchBar.subviews)
    {
        if ([subview isKindOfClass:[UITextField class]])
        {
            searchBarTextField = (UITextField *)subview;
            break;
        }
    }
    searchBarTextField.enablesReturnKeyAutomatically = NO;
}