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我正在使用 React,我正在尝试Fade使用 React-transition-group 创建一个组件,以根据状态中存储的条件淡入和淡出元素:http ://reactcommunity.org/react-transition-组/css-过渡/

这就是我现在所拥有的:

import React from "react";
import ReactDOM from "react-dom";
import { CSSTransition } from "react-transition-group";

import "./styles.css";

class Example extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      mounted: false
    };
  }
  componentDidMount() {
    setTimeout(() => {
      this.setState({
        mounted: true
      });
    }, 10);
  }
  render() {
    return (
      <div className="root">
        <CSSTransition
          in={this.state.mounted}
          appear={true}
          unmountOnExit
          classNames="fade"
          timeout={1000}
        >
          {this.state.mounted ? (
            <div>
              <button
                onClick={() => {
                  this.setState({
                    mounted: !this.state.mounted
                  });
                }}
              >
                Remove
              </button>
              <div>COMPONENT</div>
            </div>
          ) : (
            <div />
          )}
        </CSSTransition>
      </div>
    );
  }
}

这是CSS

.fade-enter {
    opacity: 0;
    transition: opacity .5s ease;
}

.fade-enter-active {
    opacity: 1;
    transition: opacity .5s ease;
}

.fade-exit {
    opacity: 1;
    transition: opacity .5s ease;
}

.fade-exit-active {
    opacity: 0;
    transition: opacity .5s ease;
}

安装组件后,不透明度会在 0.5 秒内从 0 过渡到 1。但是当它卸载时,它没有动画:组件在没有过渡的情况下消失。

我用这个组件制作了一个沙箱来测试它:https ://codesandbox.io/s/k027m33y23 我确信这是一种常见的情况,但我找不到在卸载时为组件设置动画的方法。如果有人有任何想法,将非常欢迎!

-- 编辑 -- 正如@IPutuYogaPermana 所说,CSSTransition 中的条件渲染不是必需的。所以这:

{this.state.mounted ? (
<div>
    <button
    onClick={() => {
        this.setState({
        mounted: !this.state.mounted
        });
    }}
    >
    Remove
    </button>
    <div>COMPONENT</div>
</div>
) : (
<div />
)}

应该是这样的:

<div>
    <button
    onClick={() => {
        this.setState({
        mounted: !this.state.mounted
        });
    }}
    >
    Remove
    </button>
    <div>COMPONENT</div>
</div>

该组件将根据inCSSTransition 组件中的属性自动挂载或卸载。这里是codesandbox中的最终代码:https ://codesandbox.io/s/62m86nm7qw

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2 回答 2

3

可以预料,因为随着状态的改变,动画还没有开始,但是孩子们已经走了。

所以它就像神奇地瞬间消失。那么我们只需要隐藏它对吗?删除条件渲染。

我检查了,动画完成后节点自动删除。所以不需要使用条件渲染。幸运的是!代码变为:

import React from "react";
import ReactDOM from "react-dom";
import { CSSTransition } from "react-transition-group";

import "./styles.css";

class Example extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      logoIntro: true,
      mounted: false
    };
  }
  componentDidMount() {
    this.setState({
      mounted: true
    });
  }
  render() {
    return (
      <div className="root">
        <CSSTransition
          in={this.state.mounted}
          appear={true}
          unmountOnExit
          classNames="fade"
          timeout={1000}
        >
          <div>
            <button
              onClick={() => {
                this.setState({
                  mounted: !this.state.mounted
                });
              }}
            >
              Remove
            </button>
            <div>SOME COMPONENT</div>
          </div>
        </CSSTransition>
      </div>
    );
  }
}

ReactDOM.render(<Example />, document.getElementById("root"));
于 2018-08-09T15:32:09.063 回答
0

我创建了一个通用目的WrapperComponent,以便您可以为元素设置动画,而不必总是一遍又一遍地编写相同的东西。

import { useEffect, useState } from "react"
import { CSSTransition } from "react-transition-group"

export const MountAnimation = ({
  children,
  timeout = 300, // MATCH YOUR DEFAULT ANIMATION DURATION
  isVisible = false,
  unmountOnExit = true,
  classNames = "transition-translate-y", // ADD YOUR DEFAULT ANIMATION
  ...restProps
}) => {
  const [isMounted, setIsMounted] = useState(isVisible)
  useEffect(() => setIsMounted(isVisible), [isVisible])
  return (
    <CSSTransition
      in={isMounted}
      timeout={timeout}
      classNames={classNames}
      unmountOnExit={unmountOnExit}
      {...restProps}
    >
      <>{children}</>
    </CSSTransition>
  )
}

就像这样使用它:

import { MountAnimation } from '../../path/to/component'

...

const [isElementVisible, setIsElementVisible] = useState(false)

return (
    <MountAnimation isVisible={isElementVisible}>
       // your content here
    </MountAnimation>

)

于 2022-01-21T22:28:06.903 回答