css - 为什么 ThemeProvider(Material UI)在这里不适合我？

Question

我经常使用 Material UI，所以这令人费解。我查看了文档，检查了我的代码，但看不到问题所在。我希望嵌套组件中的 H2 标签使用 Arial。但是，它是使用 Times 渲染的。我不确定为什么。

这是我的 index.tsx:

import React from "react";
import ReactDOM from "react-dom";
import App from "./components/App";
import { Provider } from "react-redux";
import configureStore from "./redux/stores/main";
import * as serviceWorker from "./serviceWorker";
import { createMuiTheme } from "@material-ui/core";
import myTheme from "./styling/mainTheme";
import { ThemeProvider } from "@material-ui/styles";

const theme = createMuiTheme({
  typography: {
    fontFamily: ["Arial"].join(",")
  }
});

ReactDOM.render(
  <ThemeProvider theme={theme}>
    <Provider store={configureStore()}>
      <App />
    </Provider>
  </ThemeProvider>,
  document.getElementById("root")
);

serviceWorker.unregister();

我的应用组件:

import React from "react";
import { useSelector } from "react-redux";
import HeaderContainer from "../containers/layout/header/HeaderContainer";
import { ThemeProvider, useTheme } from "@material-ui/styles";
import theme from "../styling/mainTheme";
import { createMuiTheme } from "@material-ui/core";




const App: React.FC = () => {
    const theme = useTheme();
  return (
      <div className="App">
          <HeaderContainer />
      </div>
  );
};

export default App;

header 容器(将包含逻辑):

  import * as React from 'react';
import Header from '../../../components/layout/header/Header';

export interface HeaderContainerProps {
}

export default class HeaderContainer extends React.Component<HeaderContainerProps> {
  public render() {
    return <Header />
  }
}

最后是标题:

import * as React from "react";
import { styled } from "@material-ui/core/styles";
import AppBar from "@material-ui/core/AppBar";





export default function Header() {
    return (
        <AppBar>
            <h2>Hello</h2>
        </AppBar>
    )
}

我试过将 ThemeProvider 放在不同的组件中，但我的 h2 仍然呈现为 Times。如果有人能发现问题，那就太好了。谢谢

Answer 1

查看 material-ui 的文档，发现你从库中导入了一些东西，方法不对。就像文档状态一样-

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

基本可以的

import { useTheme, createMuiTheme } from '@material-ui/core/styles';

ThemeProvider 也是如此

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