我想使用 useStyle 来设置类组件的样式。但这可以很容易地完成钩子。但我想改用组件。但是我不知道该怎么做。
import React,{Component} from 'react';
import Avatar from '@material-ui/core/Avatar';
import { makeStyles } from '@material-ui/core/styles';
import LockOutlinedIcon from '@material-ui/icons/LockOutlined';
const useStyles = makeStyles(theme => ({
'@global': {
body: {
backgroundColor: theme.palette.common.white,
},
},
paper: {
marginTop: theme.spacing(8),
display: 'flex',
flexDirection: 'column',
alignItems: 'center',
},
avatar: {
margin: theme.spacing(1),
backgroundColor: theme.palette.secondary.main,
}
}));
class SignIn extends Component{
const classes = useStyle(); // how to assign UseStyle
render(){
return(
<div className={classes.paper}>
<Avatar className={classes.avatar}>
<LockOutlinedIcon />
</Avatar>
</div>
}
}
export default SignIn;
你可以这样做:
import { withStyles } from "@material-ui/core/styles";
const styles = theme => ({
root: {
backgroundColor: "red"
}
});
class ClassComponent extends Component {
state = {
searchNodes: ""
};
render() {
const { classes } = this.props;
return (
<div className={classes.root}>Hello!</div>
);
}
}
export default withStyles(styles, { withTheme: true })(ClassComponent);
如果您不使用主题,请忽略withTheme: true
。
要使其在 TypeScript 中工作,需要进行一些更改:
import { createStyles, withStyles, WithStyles } from "@material-ui/core/styles";
const styles = theme => createStyles({
root: {
backgroundColor: "red"
}
});
interface Props extends WithStyles<typeof styles>{ }
class ClassComponent extends Component<Props> {
// the rest of the code stays the same
对于类组件,您可以使用withStyles
而不是makeStyles
import { withStyles } from '@material-ui/core/styles';
const useStyles = theme => ({
fab: {
position: 'fixed',
bottom: theme.spacing(2),
right: theme.spacing(2),
},
});
class ClassComponent extends Component {
render() {
const { classes } = this.props;
{/** your UI components... */}
}
}
export default withStyles(useStyles)(ClassComponent)
嘿,我也有类似的问题。我通过将makeStyles
替换为withStyles
来解决它,然后在执行类似const classes = useStyle();
的操作时,将其替换为const classes = useStyle;
您注意到useStyle
不应该是函数调用,而应该是变量赋值。
在您进行这些更改后,这应该可以正常工作。
useStyles
是一个反应钩子。您只能在函数组件中使用它。
此行创建钩子:
const useStyles = makeStyles(theme => ({ /* ... */ });
您在函数组件中使用它来创建类对象:
const classes = useStyles();
然后在 jsx 中使用类:
<div className={classes.paper}>
建议资源:https://material-ui.com/styles/basics/https://reactjs.org/docs/hooks-intro.html
像已经说过的其他答案一样,您应该使用withStyles
来扩充组件并通过属性传递classes
。我冒昧地将 Material-UI 压力测试示例修改为使用类组件的变体。
请注意,当您只想使用这些样式时,通常不需要withTheme: true
选项。此示例中需要它,因为在渲染中使用了主题的实际值。设置此选项可使theme
通过类属性可用。应始终提供classes
道具,即使未设置此选项也是如此。
const useStyles = MaterialUI.withStyles((theme) => ({
root: (props) => ({
backgroundColor: props.backgroundColor,
color: theme.color,
}),
}), {withTheme: true});
const Component = useStyles(class extends React.Component {
rendered = 0;
render() {
const {classes, theme, backgroundColor} = this.props;
return (
<div className={classes.root}>
rendered {++this.rendered} times
<br />
color: {theme.color}
<br />
backgroundColor: {backgroundColor}
</div>
);
}
});
function StressTest() {
const [color, setColor] = React.useState('#8824bb');
const [backgroundColor, setBackgroundColor] = React.useState('#eae2ad');
const theme = React.useMemo(() => ({ color }), [color]);
const valueTo = setter => event => setter(event.target.value);
return (
<MaterialUI.ThemeProvider theme={theme}>
<div>
<fieldset>
<div>
<label htmlFor="color">theme color: </label>
<input
id="color"
type="color"
onChange={valueTo(setColor)}
value={color}
/>
</div>
<div>
<label htmlFor="background-color">background-color property: </label>
<input
id="background-color"
type="color"
onChange={valueTo(setBackgroundColor)}
value={backgroundColor}
/>
</div>
</fieldset>
<Component backgroundColor={backgroundColor} />
</div>
</MaterialUI.ThemeProvider>
);
}
ReactDOM.render(<StressTest />, document.querySelector("#root"));
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700&display=swap" />
<link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons" />
<script src="https://unpkg.com/react@16/umd/react.production.min.js"></script>
<script src="https://unpkg.com/react-dom@16/umd/react-dom.production.min.js"></script>
<script src="https://unpkg.com/@material-ui/core@4/umd/material-ui.production.min.js"></script>
<div id="root"></div>
另一种方法可以做到这一点,尽管有点解决方法。
有些人可能会说这并不能真正回答这个问题,但我认为它确实如此。最终结果是useStyles()
为基于类的多部分父组件提供样式。
就我而言,我需要标准的 Javascript 类导出,以便我可以调用new MyClass()
而不会出现MyClass is not a constructor
错误。
import { Component } from "./react";
import { makeStyles } from "@material-ui/core/styles";
const useStyles = makeStyles((theme) => ({
someClassName: {
...
}
}));
export default class MyComponent extends Component {
render() {
return <RenderComponent {...this.props} />;
}
}
function RenderComponent(props) {
const classes = useStyles();
return (
/* JSX here */
);
}
类组件在类名中添加多个类
import { withStyles } from "@material-ui/core/styles";
const styles = theme => ({
root: {
backgroundColor: "red"
},
label: {
backGroundColor:"blue"
}
});
class ClassComponent extends Component {
state = {
searchNodes: ""
};
render() {
const { classes } = this.props;//
return (
<div className={classes.root + classes.label}>Hello!</div> //i want to add label style also with
);
}
}