使用伪元素的样式化组件 :checked

Question

我正在制作带样式组件的切换开关组件，切换时我想更改背景颜色。我在这里尝试 select 并更改它 ${SwitchInputUI}:checked + ${SwitchSliderUI}{ background-color:#737A9B;} 但它不起作用。我 select 做对了吗？这里满了code.Please帮帮我

import React from 'react';
import styled from 'styled-components'

const SwitchInputUI = styled.input.attrs({ type: 'checkbox' })`
    opacity: 0;


`
const SwitchUI =styled.label`
    position: relative;
    display: inline-block;
    width: 22px;
    height: 12px;
    margin-bottom: 0;
    vertical-align: middle;
    ${SwitchInputUI}:checked + ${SwitchSliderUI}{ 
        background-color: #737A9B; 
    }
     ${SwitchInputUI}:checked + ${SwitchSliderUI}:before{
        transform: translateX(10px);
    }

`

const SwitchSliderUI= styled.span`
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color:#BBCDD9;
    transition: .4s;
    border-radius: 10px;

    &:before {
        content: "";
        position: absolute;
        width: 10px;
        height: 10px;
        left: 1px;
        bottom: 1px;
        background-color: #FFF;
        transition: .4s;
        border-radius: 50%;
    }
`

const Switch = () => {
  return (
      <SwitchUI> 
          <SwitchInputUI/>
          <SwitchSliderUI/>
      </SwitchUI>
  );
};
export default Switch;

Answer 1

试试是否有帮助：

${SwitchInputUI} + ${SwitchSliderUI}{ 
    '&:checked':{background-color: #737A9B; }
}

Answer 2

问题是您在 SwitchUI 中使用 SwitchSliderUI 之前定义它。更改顺序即可。

import React from 'react';
import styled from 'styled-components'

const SwitchInputUI = styled.input.attrs({ type: 'checkbox' })`
    opacity: 0;
`

const SwitchSliderUI= styled.span`
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color:#BBCDD9;
    transition: .4s;
    border-radius: 10px;

    &:before {
        content: "";
        position: absolute;
        width: 10px;
        height: 10px;
        left: 1px;
        bottom: 1px;
        background-color: #FFF;
        transition: .4s;
        border-radius: 50%;
    }
`
const SwitchUI =styled.label`
    position: relative;
    display: inline-block;
    width: 22px;
    height: 12px;
    margin-bottom: 0;
    vertical-align: middle;
    ${SwitchInputUI}:checked + ${SwitchSliderUI}{ 
        background-color: #737A9B; 
    }
     ${SwitchInputUI}:checked + ${SwitchSliderUI}:before{
        transform: translateX(10px);
    }
`

const Switch = () => {
  return (
      <SwitchUI> 
          <SwitchInputUI/>
          <SwitchSliderUI/>
      </SwitchUI>
  );
};
export default Switch;

这里的工作沙箱：https://codesandbox.io/s/sad-thompson-sfzfv

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