我想在我的路线上有一个未找到的组件

import React from 'react';
import { Route, Switch } from 'react-router-dom';
import PropTypes from 'prop-types';
import Home from './components/home';
import MyWork from './components/work/myWork';
import WorkShow from './components/work/workShow';
import NavigationBar from './components/shared/navbar';
import Footer from './components/shared/footer';
import CategoryShow from './components/category/categoryShow';
import PostIndex from './components/post/postIndex';
import PostShow from './components/post/postShow';
import PostSearch from './components/post/postSearch';
import TagShow from './components/tag/tagShow';
import NotFound from './components/shared/notFound';

const DefaultLayout = ({ component: Component, ...rest }) => (
  <Route
    {...rest} render={matchProps => (
      <div>
        <NavigationBar />
        <div className="mainContent">
          <Component {...matchProps} />
        </div>
        <Footer />
      </div>
    )}
  />
);

DefaultLayout.propTypes = ({
  component: PropTypes.shape.isRequired,
});

const BlogLayout = ({ component: Component, ...rest }) => (
  <Route
    {...rest} render={matchProps => (
      <div>
        <NavigationBar path="blog" />
        <div className="mainContent">
          <Component {...matchProps} />
        </div>
        <Footer />
      </div>
    )}
  />
);

BlogLayout.propTypes = ({
  component: PropTypes.shape.isRequired,
});

const Work = () => (
  <Switch>
    <Route exact path="/my-work" component={MyWork} />
    <Route path="/my-work/:workName" component={WorkShow} />
  </Switch>
);

const Blog = () => (
  <Switch>
    <Route exact path="/blog" component={PostIndex} />
    <Route path="/blog/search" component={PostSearch} />
    <Route exact path="/blog/:postName" component={PostShow} />
    <Route path="/blog/category/:categoryName" component={CategoryShow} />
    <Route path="/blog/tag/:tagName" component={TagShow} />
  </Switch>
);

const routes = (
  <div>
    <DefaultLayout exact path="/" component={Home} />
    <DefaultLayout path="/my-work" component={Work} />
    <BlogLayout path="/blog" component={Blog} />
  </div>
);

export default routes;

我试过：

const routes = (
      <div>
        <DefaultLayout exact path="/" component={Home} />
        <DefaultLayout path="/my-work" component={Work} />
        <BlogLayout path="/blog" component={Blog} />
        <BlogLayout path="*" component={NotFound} />
      </div>
    );

但是 NotFound 组件总是呈现，我只希望在用户输入不正确的 URL 时呈现它。我将如何在 react router v4 中做到这一点？