使用 Material UI <Grid> 进行两列布局时出现问题

Question

我正在尝试实现两列布局，它们的高度相等，并且各自占据屏幕的一半。图片解释得更好，这是一张。

不工作的代码如下：

import React from "react";
import { makeStyles } from "@material-ui/core/styles";
import CssBaseline from "@material-ui/core/CssBaseline";
import Grid from "@material-ui/core/Grid";
import Paper from "@material-ui/core/Paper";

const useStyles = makeStyles(theme => ({
  root: {
    flexGrow: 1,
    alignItems: "stretch"
  },
  column: {
    flexDirection: "column"
  },
  paper: {
    padding: theme.spacing(2),
    textAlign: "center",
    color: theme.palette.text.secondary
  }
}));

export default props => {
  const classes = useStyles();
  return (
    <>
      <CssBaseline />
      <Grid container className={classes.root}>
        {/* COLUMN ONE */}
        <Grid container item className={classes.column}>
          <Grid item xs={6}>
            <Paper className={classes.paper}>1: xs=6</Paper>
          </Grid>
          <Grid item xs={6}>
            <Paper className={classes.paper}>1: xs=6</Paper>
          </Grid>
          <Grid container item>
            <Grid item xs={3}>
              <Paper className={classes.paper}>1: xs=3 left</Paper>
            </Grid>
            <Grid item xs={3}>
              <Paper className={classes.paper}>1: xs=3 right</Paper>
            </Grid>
          </Grid>
        </Grid>
        {/* COLUMN TWO */}
        <Grid container item className={classes.column}>
          <Grid item xs={6}>
            <Paper className={classes.paper}>2: xs=6</Paper>
          </Grid>
          <Grid item xs={6}>
            <Paper className={classes.paper}>2: xs=6</Paper>
          </Grid>
        </Grid>
      </Grid>
    </>
  );
};

强制性代码和盒子在这里。

有人可以解释一下我在这里做错了什么吗？

Answer 1

Material UI 布局嵌套网格容器的方式存在一个错误，请参见此处。由@londonoliver 找到的解决方法是将容器嵌套在网格项内：

<Grid container direction="row">
  <Grid item>
    <Grid container direction="column">
      <Grid item>1</Grid>
      <Grid item>2</Grid>
    </Grid>
  </Grid>
  <Grid item>
    <Grid container direction="column">
      <Grid item>3</Grid>
      <Grid item>4</Grid>
    </Grid>
  </Grid>
</Grid>