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React Hooks: useState 给出错误:TypeError: undefined is not iterable (cannot read property Symbol(Symbol.iterator))

我想使用 React 钩子管理以下网站项目的状态:http : //konekto.world

遵循以下教程后:https : //medium.com/simply/state-management-with-react-hooks-and-context-api-at-10-lines-of-code-baf6be8302c

我想写给我的钩子

FormPersonType.js 文件

import React, { createContext, useContext, useReducer } from 'react';
import { Grid, IconButton, Typography } from '@material-ui/core';
import ArrowForward from '@material-ui/icons/ArrowForward';
import { makeStyles } from '@material-ui/core/styles';
import RadioButtonGroup from './RadioButtonGroup';
import RadioButton from './RadioButton';
import { useStateValue, StatePersonType } from '../App';

const useStyles = makeStyles(theme => ({
  container: {
    alignItems: 'center',
    // background: 'white',
    border: 'black',
    'border-width': 'medium',
    'margin-top': '80px',
    background: 'rgba(255, 255, 255, 0.8)',
    'border-radius': …
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