只需使用IntrinsicHeight换行并设置Row的对齐方式。

IntrinsicHeight(
  child: Row(
    crossAxisAlignment: CrossAxisAlignment.start,
    children: [
      TextField(),
      TextField()
    ],
  ),
)

您可以使用TextField的decoration参数中的设置：你可以设置错误文本高度如下，以避免在验证失败时小部件重新排列：

decoration: const InputDecoration(
    errorStyle: TextStyle(height: 0),
  )

这将使小部件保持对齐，但随后您必须在某处放置Text小部件，因为如果您从验证器返回String以显示错误，则这将扰乱布局。
下面是一个更完整的例子：由于这是一个登录字段的密码字段，我不需要显示错误来让用户了解出错了，出现的红色下划线足以让用户了解出错的地方

//...at some point in your form
TextFormField(
  obscureText: true,
  decoration: const InputDecoration(
    labelText: 'Password',
    errorStyle: TextStyle(height: 0),
  ),
  controller: pwdTec,
  validator: (value) {
    if (value == null || value.isEmpty || value.length < 8) {
      return ""; //this will just underline the field in red
    }
    return null;
  },
  onFieldSubmitted: (_) => _formSubmit(),
),
Text(_errorMessage), //_errorMessage is a field of a StatefulWidget, that gets update by _formSubmit() with a setState() in case of errors that require an explanation

//...rest of the form

请添加一个空的帮助器文本Ex：- helperText：“”

在TextFormField小部件中使用validator属性和decoration属性显示错误消息

Form(
    key: formkey,
    child: Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: <Widget>[
        Text(
          title,
          style: TextStyle(fontWeight: FontWeight.bold, fontSize: 15),
        ),
        SizedBox(
          height: 10,
        ),
        TextFormField(
            inputFormatters: [
              FilteringTextInputFormatter.allow(RegExp('[a-zA-Z0-9]')),
              LengthLimitingTextInputFormatter(25),
            ],
            controller: controller,
            obscureText: isPassword,
            autovalidateMode: AutovalidateMode.onUserInteraction,
            validator: validateEmail,
            decoration: const InputDecoration(
                border: InputBorder.none,
                fillColor: Color(0xfff3f3f4),
                filled: true))
      ],
    ),
  ),