反应过渡组出现过渡无法正常工作 [英] react transition group appear transitions not working properly

问题描述

我正在使用反应过渡组来处理动画CSSTransitions.呈现.我想要组件的简单淡入.

I'm using react transition group to handle animated CSSTransitions when a component is rendered. I want a simple fade in of a component.

过渡似乎正常，但是过渡不起作用.

The transition out seems to work properly, but the in transition does not.

如果将调试器放在onEnter属性上，则可以看到转换实际上应该"按预期工作.触发Enter-active状态，该元素以0.1的不透明度开始，如果我恢复调试器，则会发生过渡.

If I put a debugger on the onEnter property, I can see that the transition actually "should" work as expected. The enter-active state is triggered, the element starts at 0.1 opacity, and if I resume the debugger, the transition takes place.

但是如果没有调试器，则在呈现组件时，即使将enter-active状态添加到了组件，它也可以立即可见-不会发生不透明褪色.

But without the debugger, when the component renders, even though the enter-active state is added to the component, it is just immediately visible - no opacity fade in occurs.

这是我的代码:

<TransitionGroup component={null}>
{mobileSelectorsActive && 
<CSSTransition 
    classNames="anim_mobile_selectors" 
    timeout={5000}
    //appear={true}
    //mountOnEnter={true}
    onEnter={()=>{
        //debugger;
    }}
>
<div>...</div>
</CSSTransition>
}
</TransitionGroup>

和CSS:

.anim_mobile_selectors {
    &-enter {
        opacity: 0.1;
        transition: opacity 5000ms linear;
    }
    &-enter-active, &-enter-done {
        opacity:1; 
    }
    &-exit {
        opacity:1;
    }
    &-exit-active {
        opacity: 0.1;
        transition: opacity 5000ms linear;
    }
}

推荐答案

这有点麻烦，但万一它对其他人有帮助，我通过缩短过渡时间并将动画放在结束"的位置来解决. "状态:

This is a bit of a hack, but in case it helps anyone else, I solved this by shortening the transition in, and putting the animation on the "end" state:

//JSX
<CSSTransition 
    classNames="anim_mobile_selectors" 
    timeout={{
        enter: 100,
        exit: 500,
    }}
><div>...</div>
</CSSTransition>



//CSS
    .anim_mobile_selectors {
        &-enter {
            opacity: 0.01;
        }
        &-enter-active {
            opacity: 0.01;
        }
         &-enter-done {
            opacity:1; 
            transition: opacity 500ms linear;
        }
        &-exit {
            opacity:1;
        }
        &-exit-active {
            opacity: 0.01;
            transition: opacity 500ms linear;
        }
    }

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