在createMuiTheme中访问以前的主题变量

Question

运行材质UI 1.0.0-beta.24

我正在使用createMuiTheme以下方式设置新主题:

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

const theme = createMuiTheme({
  typography: {
    fontSize: 16
  }
});

export default theme;

我怎样才能直接访问我直接覆盖的主题？我想这样做,这是行不通的:

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

const theme = createMuiTheme({
  typography: {
    fontSize: theme.typography.fontSize + 2
  }
});

export default theme;

Answer 1

您需要创建默认主题的实例,并在定义自己的主题时使用它:

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

const defaultTheme = createMuiTheme();

const theme = createMuiTheme({
  typography: {
    fontSize: defaultTheme.typography.fontSize + 2
  }
});

export default theme;

Answer 2

您也可以创建您的主题，然后在theme创建后添加到它。

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

const theme = createMuiTheme();
theme.typography = {
  ...theme.typography,
  fontSize: theme.typography.fontSize + 2
}

export default theme;