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错误 No Material widget found.

错误最后两行提示

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I/flutter (30116): Another exception was thrown: No Material widget found.
I/flutter (30116): Another exception was thrown: A RenderFlex overflowed by 199318 pixels on the bottom.

如下

error

代码：

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@override
Widget build(BuildContext context) {
  // TODO: implement build
  return StoreConnector<InfoState, User>(
    converter: (store) {
      _store = store;
      return store.state.user;
    },
    builder: (context, user) {
      return _getBody();
    },
  );
}

Widget _getBody() {
  return Column(
    mainAxisAlignment: MainAxisAlignment.center,
    children: <Widget>[
      Container(
        margin: EdgeInsets.symmetric(horizontal: 50),
        width: double.infinity,
        child: TextField(
          controller: passwd2Controller,
          decoration: InputDecoration(
            hintText: "new password",
            labelText: "输入新密码",
          ),
        ),
      ),
    ],
  );
}

builder 不能直接传入 Column ,否则报错

必须在上面再加一层 Scaffold

如下即可：

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Widget _getBody() {
  return Scaffold(  // 增加 Scaffold
    body: Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        Container(
          margin: EdgeInsets.symmetric(horizontal: 50),
          width: double.infinity,
          child: TextField(
            controller: passwd2Controller,
            decoration: InputDecoration(
              hintText: "new password",
              labelText: "输入新密码",
            ),
          ),
        ),
      ],
    ),
  );
}