Dotween实现打字机效果,并向下滚屏

            _lowerText.DOText(_dialogCache.ToString(), _dialogCache.Length / cfg.TypeSpeed)
                      .SetEase(Ease.Linear)
                      .OnComplete(OnRobotTypeEnd)
                      .OnUpdate(() => _scrollRect.verticalNormalizedPosition = 0)
                      .Goto((_dialogCache.Length - newDialog.Length) / cfg.TypeSpeed, true);