报错如下：

The following assertion was thrown during performLayout():

An InputDecorator, which is typically created by a TextField, cannot have an unbounded width.

This happens when the parent widget does not provide a finite width constraint. For example, if the

InputDecorator is contained by a Row, then its width must be constrained. An Expanded widget or a

SizedBox can be used to constrain the width of the InputDecorator or the TextField that contains it.

'package:flutter/src/material/input_decorator.dart':

Failed assertion: line 945 pos 7: 'layoutConstraints.maxWidth < double.infinity'

Either the assertion indicates an error in the framework itself, or we should provide substantially

more information in this error message to help you determine and fix the underlying cause.

In either case, please report this assertion by filing a bug on GitHub:

说TextField有一个无边界的宽度，必须要指定一个宽度，

方案1

指定固定宽度

方案2（官方文档推荐）

结构 Row->TextField+Container,改成 Row> (Expanded>TextField ) + Container。

比较基础的bug，记录下。