如何在样式组件中访问 Material-ui 的主题

我将 CRA 与 Material-ui 和 Styled Components 类型的样式一起使用。 在构建 CSS 时，我想访问 Material-ui 的默认主题。

package.json 的一部分：

  "dependencies": {
    "react": "^16.8.6",
    "react-dom": "^16.8.6",
    "react-scripts": "3.0.1",
    "@material-ui/core": "^4.2.1",
    "@material-ui/icons": "^4.2.1",
    "@material-ui/styles": "^4.2.1",
    "styled-components": "^4.3.2"
  }

当我尝试以下操作时theme存在于props但它是一个空对象。

StyledApp.js：

import styled from "styled-components";
import Button from "@material-ui/core/Button";

export const StyledButtonUsingTheme = styled(Button)`
  //Below will give "Cannot read property 'error' of undefined" 
  background-color: ${props => props.theme.palette.error.light};
`;

App.js:

import React from "react";
import "./App.css";

import { StylesProvider, ThemeProvider } from "@material-ui/styles";
import { createMuiTheme } from "@material-ui/core/styles";

import { StyledButtonUsingTheme } from "./StyledApp";

function App() {
  const defaultTheme = createMuiTheme();

  window.console.log("Default theme passing to ThemeProvider", defaultTheme);

  return (
    <StylesProvider injectFirst>
      <ThemeProvider theme={defaultTheme}>
        <div className="App">
          <StyledButtonUsingTheme variant="outlined">
            Styled Button Using Theme
          </StyledButtonUsingTheme>
        </div>
      </ThemeProvider>
    </StylesProvider>
  );
}

export default App;

控制台.登录App.js显示整个主题对象，这就是我传递给 ThemesProvider 的内容。有趣的是props.theme有没有！但遗憾的是没有价值观。

正如霍里德在评论中所说，使用ThemeProvider from Styled-Components将使您能够访问样式组件内的主题属性。 但 Material-UI 不再将该主题应用于它自己的组件。

我发现的解决方法既丑陋又简单：使用两个主题提供程序。因此，Material-UI 将主题应用于其组件，您可以在样式化组件中访问该主题。

import { ThemeProvider } from "styled-components";
import { MuiThemeProvider,StylesProvider } from "@material-ui/core/styles";

ReactDOM.render(

  //Make sure the Material stylesheet is placed above your own 
  //styles so you can overwrite them
  <StylesProvider injectFirst> 

    //Use the theme in the ThemeProvider for Material-UI so
    //styles are applied to the Material-UI components
    <MuiThemeProvider theme={theme}>

      //Use also the ThemeProvider for Styled-Components so 
      //you can access the theme in your own css
      <ThemeProvider theme={theme}>

        //Include your app and you have acces to everything 
        <App />

      </ThemeProvider>

    </MuiThemeProvider>

  </StylesProvider>,

document.getElementById("app"));