为zefyr场颤动添加字符限制

Question

如何在Flutter中为Zefyr字段添加字符限制？

                  ZefyrField(
                decoration: InputDecoration(
                  errorMaxLines: 2,
                  border: InputBorder.none,
                ),
                controller: _controller,
                focusNode: _descriptionFocus,
                autofocus: false,

              ),