SetState在componentDidMount中调用后不会重新渲染组件

Question

如果用户之前已经登录并且该信息已保存，则我试图更改组件中的路由。我看到setState方法中正在调用componentDidMount，但是render方法没有被再次调用，而不是在用户中“登录”。

如果我登录用户，将调用loggedIn()并以正确的状态集重新呈现该组件。

根据ReactJS文档，我可以立即在setState中调用componentDidMount，但是它似乎无法使用正确的状态进行渲染。任何帮助将不胜感激

import * as React from 'react';
import { Route, Redirect, withRouter, RouteComponentProps } from 'react-router-dom';
import SignIn from '../components/signIn/signInComponent';
import Register from '../components/register/registerComponent';
import Dashboard from '../components/dashboard/dashboard.component';

interface AuthState {
  isAuthenticated: boolean
}

class Routes extends React.Component<any, AuthState>{

  constructor(props: any) {
    super(props);

    this.state = {
      isAuthenticated: false
    };
  }

  componentDidMount = () => {
    this.setState({
      isAuthenticated: true
    });
  }

  loggedIn = () => {
    this.setState({
      isAuthenticated: true
    });
  }

  render() {
    return (
      <div>
            <Route path='/' exact render={() => (
              !this.state.isAuthenticated ? (<Redirect to='/signin'/>) : (<Dashboard/>)
            )}/>
            <Route path='/signin' exact render={() => (
              <SignIn onLoggedIn={this.loggedIn}/>
            )}/>
            <Route path='/register' exact component={Register}/>
      </div>
    );
  }
}

export default withRouter(Routes);