我 尝试 使用 React Hooks 重构我的代码，但我真的不明白如何使用 Hooks 通过 React Routers 将 props 传递给我的组件。

旧的（正常）React 代码如下所示：

App.js

import React from 'react';
import { withRouter } from "react-router-dom";
import {Routes} from './routes/Routes';

function App() {
    const childProps={something: "else"};
    return (
        <div className="App">
            <Routes childProps={childProps} />
        </div>
    );
}

export default withRouter(App);

Routes.js

import {Switch, Route} from 'react-router-dom';
import Game from '../game/Game';
import Scenario from '../game/Scenario';

const CustomRoute = ({ component: C, props: cProps, ...rest }) =>
    <Route
        {...rest}
        render={(props) =>
            <C {...props} {...cProps} />
        }
    />;

export const Routes = ({childProps}) => 
    <Switch>
        <Route path="/" exact component={Game} props={childProps} />
        <CustomRoute path="/scenario/:id" exact component={Scenario} props={childProps}/>
    </Switch>

Game.js

import React from 'react';

const Game = () => {
  return (
    <div className="Game">
      <header className="Game-header">
        <a href="/scenario/0">
          START
        </a>
      </header>
    </div>
  );
};

export default Game;

Scenario.js

export default class Scenario extends Component {
    constructor(props) {
        super(props);

        this.state = {
            scenarios: null,
            scenarioId: null,
            currentScenario: null
        }
    }

    async componentDidMount() {
        const scenarioId = await this.props.match.params.id;
        const scenarios = await data.scenarios;
        this.setState({scenarios, scenarioId});
        this.getScenario();
    }

    getScenario = () => {
        this.state.scenarios.forEach((scenario) => {
            if (scenario.id === this.state.scenarioId) {
                const currentScenario = scenario;
                this.setState({currentScenario});
            }
        })
    }

    render() {
        return (
            <div>
                {this.state.currentScenario != null
                    ? this.state.currentScenario.options.length === 1
                        ? (
                            <div>
                                <div>{this.state.currentScenario.text}</div>
                                <div>{this.state.currentScenario.options[0].text}</div>
                                <a href="/">Go Back</a>
                            </div>
                        )
                        : (
                            <div>
                                <div>{this.state.currentScenario.text}</div>
                                <div>{this.state.currentScenario.options.map((option, index) => (
                                    <div key={index}>
                                        <a href={`/scenario/${option.to}`}>
                                            {option.text}
                                        </a>
                                    </div>
                                ))}</div>
                            </div>
                        )
                    : null
                }
            </div>
        );
    }
};

因此我在网上找到了此代码，它可以改变我从 Router 获取 props 的方式：

HookRouter.js

import * as React from 'react';
import { BrowserRouter, Route } from 'react-router-dom';

const RouterContext = React.createContext(null);

export const HookedBrowserRouter = ({ children }) => (
  <BrowserRouter>
    <Route>
      {(routeProps) => (
        <RouterContext.Provider value={routeProps}>
          {children}
        </RouterContext.Provider>
      )}
    </Route>
  </BrowserRouter>
);

export function useRouter() {
  return React.useContext(RouterContext);
};

新App.js

import React from 'react';
import { withRouter } from "react-router-dom";
import {Routes} from './routes/Routes';
import {HookedBrowserRouter, useRouter} from './routes/HookRouter';

function App() {
    const childProps={something: "else"};
    return (
        <HookedBrowserRouter>
        <div className="App">
            <Routes childProps={childProps} />
        </div>
        </HookedBrowserRouter>
    );
}

export default withRouter(App);

我使用新的 Scenario.js 获得了他到目前为止的结果

import React, { Component, useState, useEffect } from 'react';
import data from '../data/fake';
import {useRouter} from '../routes/HookRouter';

const RouterContext = React.createContext(null);

const HookSceneario = () => {
    const [scenarios, setScenarios] = useState(null);
    const [scenarioId, setScenarioId] = useState(null);
    const [currentScenario, setCurrentScenario] = useState(null);

    // Similar to componentDidMount and componentDidUpdate:
        // Update the document title using the browser API
        // console.log(React.useContext(RouterContext));

    useEffect(() => {
        console.log(scenarios);
    });

    return (
        <div>
            // ...
        </div>
    );
}

因此 useState 替换了类构造函数中的 this.state ，而 useEffect 应该替换 componentDidMount ，但我找不到从 Router 获取 props 的方法。