使用 Material UI 反應鈎子

Question

我正在嘗試使用材料 ui 中的代碼並收到此錯誤：

Invalid hook call. Hooks can only be called inside of the body of a function component. 
This could happen for one of the following reasons:
1. You might have mismatching versions of React and the renderer (such as React DOM)
2. You might be breaking the Rules of Hooks
3. You might have more than one copy of React in the same app

如果我不使用 class，我不確定是什么導致了這個問題（因為我知道反應鈎子不能在類中使用）。 我想知道這是否與 ReactDOM 有關？

這是我使用的唯一代碼：

=======index.js=======

import React from 'react';
import ReactDOM from 'react-dom';
import App from './Pages/HomePage.jsx';

ReactDOM.render(<App />, document.getElementById('root'));

=======HomePage.js=======

import React, { useState } from 'react';
import AB from '../Components/AppBar';

export default function HP() {
  const [buttonClicked, setButtonClicked] = useState(false);

  if (buttonClicked === false ) 
      return (
          <Button color="info" onClick={() => setButtonClicked(true)}>Get Started</Button>
      )
  if (buttonClicked) return (<AB/>)
};

=======AppBar.js=======

import React from 'react';
import AppBar from '@material-ui/core/AppBar';
import Toolbar from '@material-ui/core/Toolbar';
import IconButton from '@material-ui/core/IconButton';
import Typography from '@material-ui/core/Typography';
import InputBase from '@material-ui/core/InputBase';
import { fade, makeStyles } from '@material-ui/core/styles';
import MenuIcon from '@material-ui/icons/Menu';
import SearchIcon from '@material-ui/icons/Search';

const useStyles = makeStyles(theme => ({
  root: {
    flexGrow: 1,
  },
  menuButton: {
    marginRight: theme.spacing(2),
  },
  title: {
    flexGrow: 1,
    display: 'none',
    [theme.breakpoints.up('sm')]: {
      display: 'block',
    },
  },
  search: {
    position: 'relative',
    borderRadius: theme.shape.borderRadius,
    backgroundColor: fade(theme.palette.common.white, 0.15),
    '&:hover': {
      backgroundColor: fade(theme.palette.common.white, 0.25),
    },
    marginLeft: 0,
    width: '100%',
    [theme.breakpoints.up('sm')]: {
      marginLeft: theme.spacing(1),
      width: 'auto',
    },
  },
  searchIcon: {
    width: theme.spacing(7),
    height: '100%',
    position: 'absolute',
    pointerEvents: 'none',
    display: 'flex',
    alignItems: 'center',
    justifyContent: 'center',
  },
  inputRoot: {
    color: 'inherit',
  },
  inputInput: {
    padding: theme.spacing(1, 1, 1, 7),
    transition: theme.transitions.create('width'),
    width: '100%',
    [theme.breakpoints.up('sm')]: {
      width: 120,
      '&:focus': {
        width: 200,
      },
    },
  },
}));

export default function SearchAppBar() {
  const classes = useStyles();

  return (
    <div className={classes.root}>
      <AppBar position="static">
        <Toolbar>
          <IconButton
            edge="start"
            className={classes.menuButton}
            color="inherit"
            aria-label="open drawer"
          >
            <MenuIcon />
          </IconButton>
          <Typography className={classes.title} variant="h6" noWrap>
            Material-UI
          </Typography>
          <div className={classes.search}>
            <div className={classes.searchIcon}>
              <SearchIcon />
            </div>
            <InputBase
              placeholder="Search…"
              classes={{
                root: classes.inputRoot,
                input: classes.inputInput,
              }}
              inputProps={{ 'aria-label': 'search' }}
            />
          </div>
        </Toolbar>
      </AppBar>
    </div>
  );
}

Answer 1

useStyles或makeStyles本身是 material-ui 提供的鈎子，它應該在功能組件內部。

import React from 'react'
import AppBar from '@material-ui/core/AppBar'
import Toolbar from '@material-ui/core/Toolbar'
import IconButton from '@material-ui/core/IconButton'
import Typography from '@material-ui/core/Typography'
import InputBase from '@material-ui/core/InputBase'
import { fade, makeStyles } from '@material-ui/core/styles'
import MenuIcon from '@material-ui/icons/Menu'
import SearchIcon from '@material-ui/icons/Search'

export default function SearchAppBar() {
    const classes = useStyles()

    return (
        <div className={classes.root}>
            <AppBar position="static">
                <Toolbar>
                    <IconButton
                        edge="start"
                        className={classes.menuButton}
                        color="inherit"
                        aria-label="open drawer">
                        <MenuIcon />
                    </IconButton>
                    <Typography className={classes.title} variant="h6" noWrap>
                        Material-UI
                    </Typography>
                    <div className={classes.search}>
                        <div className={classes.searchIcon}>
                            <SearchIcon />
                        </div>
                        <InputBase
                            placeholder="Search…"
                            classes={{
                                root: classes.inputRoot,
                                input: classes.inputInput
                            }}
                            inputProps={{ 'aria-label': 'search' }}
                        />
                    </div>
                </Toolbar>
            </AppBar>
        </div>
    )
}

const useStyles = makeStyles(theme => ({
    root: {
        flexGrow: 1
    },
    menuButton: {
        marginRight: theme.spacing(2)
    },
    title: {
        flexGrow: 1,
        display: 'none',
        [theme.breakpoints.up('sm')]: {
            display: 'block'
        }
    },
    search: {
        position: 'relative',
        borderRadius: theme.shape.borderRadius,
        backgroundColor: fade(theme.palette.common.white, 0.15),
        '&:hover': {
            backgroundColor: fade(theme.palette.common.white, 0.25)
        },
        marginLeft: 0,
        width: '100%',
        [theme.breakpoints.up('sm')]: {
            marginLeft: theme.spacing(1),
            width: 'auto'
        }
    },
    searchIcon: {
        width: theme.spacing(7),
        height: '100%',
        position: 'absolute',
        pointerEvents: 'none',
        display: 'flex',
        alignItems: 'center',
        justifyContent: 'center'
    },
    inputRoot: {
        color: 'inherit'
    },
    inputInput: {
        padding: theme.spacing(1, 1, 1, 7),
        transition: theme.transitions.create('width'),
        width: '100%',
        [theme.breakpoints.up('sm')]: {
            width: 120,
            '&:focus': {
                width: 200
            }
        }
    }
}))