FormKit auto-focus for non-UITableViewControllers

gistfile1.m

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
    }
    return self;
}

- (void) keyboardDidShow:(NSNotification *)notif {

    float newHeight = 240;
    if (self.view.frame.size.height > 480) {
        newHeight = 300;
    }
    self.view.frame = CGRectMake(0, 0, self.view.frame.size.width, newHeight);
    self.tableView.frame = self.view.frame;
    
    NSArray *fields = [self.formModel findTextFields];
    UITextField *focusField = nil;
    for (UITextField *f in fields) {
        if ([f isEditing]) {
            focusField = f;
            break;
        }
    }
    UITableViewCell *focusCell = (UITableViewCell *)[[focusField superview] superview];
    NSIndexPath *focusIndexPath = [self.tableView indexPathForCell:focusCell];
    [self.tableView scrollToRowAtIndexPath:focusIndexPath atScrollPosition:UITableViewScrollPositionMiddle animated:YES];
}

- (void) keyboardWillHide:(NSNotification *)notif {
    self.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.initialViewHeight);
    self.tableView.frame = self.view.frame;
}