Bootstrap 4.0.0 Carousel淡入淡出过渡

Question

在Stackoverflow上有关于Carousel淡入淡出过渡的几个问题,但它们似乎都没有在默认的4.0.0实现上工作:

<div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
  <ol class="carousel-indicators">
    <li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
    <li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
    <li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
  </ol>
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img class="d-block w-100" src="..." alt="First slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="Second slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="Third slide">
    </div>
  </div>
  <a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="sr-only">Previous</span>
  </a>
  <a class="carousel-control-next" href="#carouselExampleIndicators" role="button" data-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="sr-only">Next</span>
  </a>
</div>

carousel-item自从Alpha.6版本以来,引导程序是否改变了-s 的过渡方式？如何实现淡入淡出过渡而不是4.0.0中的幻灯片？

Answer 1

我重新打开了这个,因为问题从4 Beta改为4.0.0(稳定)......

Bootstrap 4.0.0 Carousel Fade:https:
//www.codeply.com/go/LhLJlldsLN

.carousel-fade .carousel-item {
 opacity: 0;
 transition-duration: .6s;
 transition-property: opacity;
}

.carousel-fade  .carousel-item.active,
.carousel-fade  .carousel-item-next.carousel-item-left,
.carousel-fade  .carousel-item-prev.carousel-item-right {
  opacity: 1;
}

.carousel-fade .active.carousel-item-left,
.carousel-fade  .active.carousel-item-right {
 opacity: 0;
}

.carousel-fade  .carousel-item-next,
.carousel-fade .carousel-item-prev,
.carousel-fade .carousel-item.active,
.carousel-fade .active.carousel-item-left,
.carousel-fade  .active.carousel-item-prev {
 transform: translateX(0);
 transform: translate3d(0, 0, 0);
}

在4.0 Beta期间,淡入淡出效果已从传送带中删除,并且在4.0.0中也不可用.此拉取请求表示淡入淡出效果将在4.1或4.2中返回.同时,上面的CSS将适用于4.0.0

Answer 2

在bootstrap 4中,您可以像这样添加"carousel-fade"类.

<div id="carouselExampleIndicators" class="carousel slide carousel-fade" data-ride="carousel"> 
....
</div>