CSS图像淡入淡出动画只运行第一次

Question

我正在使用CSS制作背景图像渐变动画，它在第一次运行循环时按预期工作，但第二次在整个持续时间内卡在最后一个图像上，短暂跳转到第三个图像，然后回到最后一个。

如何更新它以便在每个无限循环期间在动画中顺利运行？

#rotate {
  width: 100%;
  height: 100%;
  position: absolute;
  bottom: 0;
  right: 0;
  margin: 0;
  padding: 0;
}

#rotate li {
  animation: func 16s linear 0s infinite;
  list-style-type: none;
  width: 100%;
  height: 100%;
  position: absolute;
  bottom: 0;
  right: 0;
  background: no-repeat 50% 30% / cover;
  opacity: 0;
}

#rotate li:nth-child(1) {
  animation-delay: 0s;
  -webkit-animation-delay: 0s;
  -moz-animation-delay: 0s;
  -o-animation-delay: 0s;
}

#rotate li:nth-child(2) {
  animation-delay: 4s;
  -webkit-animation-delay: 4s;
  -moz-animation-delay: 4s;
  -o-animation-delay: 4s;
}

#rotate li:nth-child(3) {
  animation-delay: 8s;
  -webkit-animation-delay: 8s;
  -moz-animation-delay: 8s;
  -o-animation-delay: 8s;
}

#rotate li:nth-child(4) {
  animation-delay: 12s;
  -webkit-animation-delay: 12s;
  -moz-animation-delay: 12s;
  -o-animation-delay: 12s;
}

@keyframes func {
  0%,
  100% {
    opacity: 0;
    animation-timing-function: ease-in;
  }
  5%,
  90% {
    opacity: 1;
  }
}

<ul id="rotate">
  <li style="background-image: url('https://dummyimage.com/600x400/000/fff&text=one')"></li>
  <li style="background-image: url('https://dummyimage.com/600x400/000/fff&text=two')"></li>
  <li style="background-image: url('https://dummyimage.com/600x400/000/fff&text=three');"></li>
  <li style="background-image:url('https://dummyimage.com/600x400/000/fff&text=four')"></li>
</ul>

指向Codepen示例的链接：https://codepen.io/erinpearson/pen/YvxVRM?editors=1100

Answer 1

更改@keyframes中的不透明度。

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#rotate {
  width: 100%;
  height: 100%;
  position: absolute;
  bottom: 0;
  right: 0;
  margin: 0;
  padding: 0;
}

#rotate li {
  animation: func 16s linear 0s infinite;
  list-style-type: none;
  width: 100%;
  height: 100%;
  position: absolute;
  bottom: 0;
  right: 0;
  background: no-repeat 50% 30% / cover;
  opacity: 0;
}

#rotate li:nth-child(1) {
  animation-delay: 0s;
  -webkit-animation-delay: 0s;
  -moz-animation-delay: 0s;
  -o-animation-delay: 0s;
}

#rotate li:nth-child(2) {
  animation-delay: 4s;
  -webkit-animation-delay: 4s;
  -moz-animation-delay: 4s;
  -o-animation-delay: 4s;
}

#rotate li:nth-child(3) {
  animation-delay: 8s;
  -webkit-animation-delay: 8s;
  -moz-animation-delay: 8s;
  -o-animation-delay: 8s;
}

#rotate li:nth-child(4) {
  animation-delay: 12s;
  -webkit-animation-delay: 12s;
  -moz-animation-delay: 12s;
  -o-animation-delay: 12s;
}

@keyframes func {
  0% {
    opacity: 0;
  }
  6% {
    opacity: 1;
  }
  24% {
    opacity: 1;
  }
  30% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}

＆＃13;

<ul id="rotate">
  <li style="background-image: url('https://dummyimage.com/600x400/000/fff&text=one')"></li>
  <li style="background-image: url('https://dummyimage.com/600x400/000/fff&text=two')"></li>
  <li style="
  background-image: url('https://dummyimage.com/600x400/000/fff&text=three');"></li>
  <li style="background-image: url('https://dummyimage.com/600x400/000/fff&text=four')"></li>
</ul>

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