- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
  if (scrollView.panGestureRecognizer.state != UIGestureRecognizerStateBegan) {
    return;
  }

  if ([scrollView.panGestureRecognizer translationInView:scrollView].y <= 0) {
    return;
  }

  if (self.keyboardIsShown) {

    [self.messageTextView resignFirstResponder];

  }
}

- (void)adjustTableViewForMessageToolBarWithScrollToBottom:(BOOL)scrollToBottom
{
  self.tableView.contentInset = [self contentInsets];

  if (scrollToBottom) {

    CGRect frame = CGRectZero;
    frame.size.width = CGRectGetWidth(self.tableView.frame);
    frame.size.height = 10;
    frame.origin.y = self.tableView.contentSize.height - 10;

    [self.tableView scrollRectToVisible:frame animated:NO];
  }
}

- (UIEdgeInsets)contentInsets
{
  CGFloat topInset = CGRectGetMaxY(self.navigationController.navigationBar.frame);

  CGFloat bottomInset = CGRectGetHeight(self.view.frame) - CGRectGetMinY(self.messageToolBar.frame);

  return UIEdgeInsetsMake (topInset, 0, bottomInset, 0);
}