Styled-components：尝试为已经设置样式的组件设置样式时不应用样式

Question

我正在尝试为已经设置样式的组件设置样式。但新规则中的样式未应用于输出 CSS。

我可以为已经设置样式的组件设置样式吗？

预先感谢您的帮助。

编辑：添加其余的 LanugageChooser 定义

// COMPONENT THAT I'M TRYING TO STYLE
const LanguageChooser = () => {
    const Container = styled.div`
        display: flex;
        align-items: center;
        height: 36px;
        & > div:not(:last-child) {
            margin-right: 5px;
        }
    `;

    return (
        <Container>
            <Flag { ...languages.pl }/>
            <Flag { ...languages.en }/>
        </Container>
    )
}

const Flag = ({ flag, language }) => {
    const { i18n } = useTranslation();

    const Button = styled.div`
        cursor: pointer;
        font-size: 24px;
        transition: .2s all;
        &:hover {
            font-size: 36px;
        }
    `;

    return (
        <Button onClick={ () => i18n.changeLanguage(language) }>{ flag }</Button>
    )
}

// TRYING ADD MARGIN LEFT, BUT THERE IS NO RESULT.
// ANY OTHER CSS PROPERTY ARE NOT APPLYING
const Navbar = ({ color }) => {
    ...

    const StyledLanguageChooser = styled(LanguageChooser)`
       margin-left: auto;
    `;

    const Nav = styled.nav`
        display: flex;
        align-content:center;
        background: ${ color };
        padding: 2px 3px;
    `;

    return (
        <Nav className="navbar">
            <StyledNavLink to="/home">...</StyledNavLink>
            <StyledNavLink to="/maps">...</StyledNavLink>
            <StyledNavLink to="/charts">...</StyledNavLink>
            <StyledLanguageChooser/>
        </Nav>
    )
}

Answer 1

首先，将带样式的组件移到函数范围之外，否则您的样式将在每次渲染时重置，您将遇到严重的性能问题 .

其次，为了应用样式，您需要通过className 属性。

见Styling normal React components

If you use the styled(MyComponent) notation and MyComponent does not render the passed-in className prop, then no styles will be applied.

const Container = styled.div`
  display: flex;
  align-items: center;
  height: 36px;
  & > div:not(:last-child) {
    margin-right: 5px;
  }
`;
const LanguageChooser = ({ className }) => {
  return (
    <Container className={className}>
      <Flag {...languages.pl} />
      <Flag {...languages.en} />
    </Container>
  );
};

const Button = styled.div`
  cursor: pointer;
  font-size: 24px;
  transition: 0.2s all;
  &:hover {
    font-size: 36px;
  }
`;

const Flag = ({ flag, language }) => {
  const { i18n } = useTranslation();

  return <Button onClick={() => i18n.changeLanguage(language)}>{flag}</Button>;
};

Styled-components：尝试为已经设置样式的组件设置样式时不应用样式

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