React router 4 beta 2与ReactCSSTransitionGroup

Question

我更喜欢用于react-motion的ReactCSSTransitionGroup。下面的代码导致组件在路由更改时淡入(出现)，但问题是-离开组件不会淡出，它会立即离开。

<Switch>
    <FadeRoute exact path="/" component={PageLanding}/>
    <FadeRoute path="/login" component={PageLogin}/>
    <FadeRoute path="/signup" component={PageSignup}/>
    <FadeRoute component={Page404}/>
</Switch>

function FadeRoute({component:Component, ...rest}) {
    return (
        <Route {...rest} children={({location,match}) => (
                <ReactCSSTransitionGroup {...{key:Date.now(), transitionName:'fade', transitionAppear:true, transitionEnter:true, transitionLeave:true, transitionAppearTimeout:300, transitionEnterTimeout:300, transitionLeaveTimeout:300})}>
                    <Component/>
                </ReactCSSTransitionGroup>
        )} />
    );
}

<style>
.fade-enter, .fade-appear { opacity:0; }
.fade-enter.fade-enter-active,
.fade-appear.fade-appear-active { opacity:1; transition: opacity 300ms; }
.fade-leave { opacity:1; }
.fade-leave.fade-leave-active { opacity:0; transition: opacity 300ms; }
</style>

Answer 1

<Switch>的工作方式是，它只呈现路径与当前位置匹配的第一个<Route>。这意味着当您导航时，现有的<FadeRoute>会在您导航时立即卸载。它的子<CSSTransitionGroup>也已卸载，因此它没有机会为其子进程运行leave转换。

您想要做的是将<Switch>包装在<CSSTransitionGroup>中。<Switch>是将被转换的组件，因此它应该有一个key。您还应该将location对象传递给它，以便当<Switch>离开时，它使用旧的location而不是当前的one来设置动画。

<CSSTransitionGroup
  transitionName='fade'
  transitionEnterTimeout={500}
  transitionLeaveTimeout={500}
>
  <Switch key={location.pathname} location={location}>
    <Route path="/red" render={Red} />
    <Route path="/green" render={Green} />
    <Route path="/blue" render={Blue} />
  </Switch>
</CSSTransitionGroup>