reactjs - 当我重新加载页面时，Material-UI 选项卡指示器返回到第一个选项卡项

Question

我使用 React Router 实现了 Material-UI 选项卡。当我单击选项卡时，选项卡下方的蓝线选项卡指示器按预期工作，它会移动到按下的选项卡。问题在于，当我重新加载页面时，选项卡指示器会返回到第一个选项卡项。

我认为这可能是因为选项卡的初始值为零，因此当页面重新加载时，该值再次变为零。

import React, { useState } from 'react';
import Tabs from '@material-ui/core/Tabs';
import Tab from '@material-ui/core/Tab';
import SignIn from '../signIn/SignIn'
import SignUp from '../signUp/SignUp';
import About from '../about/About';
import NavbarStyles from './NavbarStyles';
import { Link, Switch, Route } from 'react-router-dom';
import { Paper } from '@material-ui/core';

/**
 * This component handles the routing and navigating the user to different sections
 */
export default function Navbar() {
  const classes = NavbarStyles();
  const [value, setValue] = useState(0);

  const handleChange = (event, newValue) => {
    setValue(newValue);
  };

  return (
    <div className={classes.root}>
      <Paper>
        <Tabs
          value={value}
          onChange={handleChange}
          variant="scrollable"
          scrollButtons="on"
          indicatorColor="primary"
          textColor="primary"
          aria-label="scrollable force tabs example"
        >
         <Tab label="Sign In" to="/signin" component={Link} />
         <Tab label="Sign Up" to="/signup" component={Link} />
         <Tab label="About" to="/about" component={Link} />
        </Tabs>
      </Paper>

      <Switch>
        <Route component={SignIn} path="/signin" />
        <Route component={SignUp} path="/signup" />
        <Route component={About} path="/about" />
      </Switch>

    </div>
  );
}


import { makeStyles } from '@material-ui/core/styles';

// This component contains the styles that is being used by its intented component
export default function NavbarStyles() {

    const useStyles = makeStyles((theme) => ({
        root: {
          flexGrow: 1,
          width: '100%',
          backgroundColor: theme.palette.background.paper,
        },
      }));

      return useStyles();

}

Answer 1

这是基于 Firealem Erkos 代码。刷新时，我加载 0，然后高亮栏会滑到当前的。看起来很奇怪。所以我没有使用 usestate(0)，而是用 currentTab 替换 0...我计算了显示在当前选项卡中的当前选项卡。代码如下。现在，当您刷新时，0 不会短暂突出显示。

   const currentTab = () => {
    let path = window.location.pathname
    if (path === "/Search") return 1
    else if (path === "/ZoneInformation") return 2
    else if (path === "/Contact") return 3
  }
 
  const [value, setValue] = React.useState(**currentTab**);