html - 纯 CSS 旋转动画在无限循环中损坏

Question

我已经有一段时间没有在这里提问了。如果我做错了什么，请原谅。

我对 CSS 动画 有疑问。我希望我的动画不断 self 重复但又不失去初始效果。但是，我的代码或 CSS 动画行为中似乎存在错误。

在它完成前 2 个旋转动画(旋转、回旋) 定义之后。循环开始，但新动画与以前不同。

我的目标是按顺序在 6 个盒子上创建旋转动画，一次一个。当所有的盒子都转动后，它们应该开始回到原来的状态，然后一个一个地依次转动。

代码:

/* -------------------------------------------------------- */
#loader {
  width: 240px;
  height: 100px;
}

.inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 2s;
  transform-style: preserve-3d;
  background-color: transparent;
}

.front,
.back {
  position: absolute;
  width: 80px;
  height: 50px;
  backface-visibility: hidden;
}


/* -------------------------------------------------------- */

#loader1 {
  float: left;
  width: 80px;
  height: 50px;
  perspective: 1000px;
  background-color: transparent;
}

#loader1 .inner {
  animation: spin 10s ease 0s infinite, spinback 10s ease 10s infinite;
  -webkit-animation: spin 10s ease 0s infinite, spinback 10s ease 10s infinite;
}

#loader1 .front {
  background-color: #db9834;
}

#loader1 .back {
  background-color: #3498db;
  transform: rotateY(180deg);
}


/* -------------------------------------------------------- */

#loader2 {
  float: left;
  width: 80px;
  height: 50px;
  perspective: 1000px;
  background-color: transparent;
}

#loader2 .inner {
  animation: spin 10s ease 1s infinite, spinback 10s ease 11s infinite;
  -webkit-animation: spin 10s ease 1s infinite, spinback 10s ease 11s infinite;
}

#loader2 .front {
  background-color: #db8834;
}

#loader2 .back {
  background-color: #3488db;
  transform: rotateY(180deg);
}


/* -------------------------------------------------------- */

#loader3 {
  float: left;
  width: 80px;
  height: 50px;
  perspective: 1000px;
  background-color: transparent;
}

#loader3 .inner {
  animation: spin 10s ease 2s infinite, spinback 10s ease 12s infinite;
  -webkit-animation: spin 10s ease 2s infinite, spinback 10s ease 12s infinite;
}

#loader3 .front {
  background-color: #db7834;
}

#loader3 .back {
  background-color: #3478db;
  transform: rotateY(180deg);
}


/* -------------------------------------------------------- */

#loader4 {
  float: left;
  width: 80px;
  height: 50px;
  perspective: 1000px;
  background-color: transparent;
}

#loader4 .inner {
  animation: spin 10s ease 3s infinite, spinback 10s ease 13s infinite;
  -webkit-animation: spin 10s ease 3s infinite, spinback 10s ease 13s infinite;
}

#loader4 .front {
  background-color: #db6834;
}

#loader4 .back {
  background-color: #3468db;
  transform: rotateY(180deg);
}


/* -------------------------------------------------------- */

#loader5 {
  float: left;
  width: 80px;
  height: 50px;
  perspective: 1000px;
  background-color: transparent;
}

#loader5 .inner {
  animation: spin 10s ease 4s infinite, spinback 10s ease 14s infinite;
  -webkit-animation: spin 10s ease 4s infinite, spinback 10s ease 14s infinite;
}

#loader5 .front {
  background-color: #db5834;
}

#loader5 .back {
  background-color: #3458db;
  transform: rotateY(180deg);
}


/* -------------------------------------------------------- */

#loader6 {
  float: left;
  width: 80px;
  height: 50px;
  perspective: 1000px;
  background-color: transparent;
}

#loader6 .inner {
  animation: spin 10s ease 5s infinite, spinback 10s ease 15s infinite;
  -webkit-animation: spin 10s ease 5s infinite, spinback 10s ease 15s infinite;
}

#loader6 .front {
  background-color: #db4834;
}

#loader6 .back {
  background-color: #3448db;
  transform: rotateY(180deg);
}

@-webkit-keyframes spin {
  0% {
    -webkit-transform: rotateY(0deg);
  }
  16% {
    -webkit-transform: rotateY(180deg);
  }
  100% {
    -webkit-transform: rotateY(180deg);
  }
}

@keyframes spin {
  0% {
    -webkit-transform: rotateY(0deg);
  }
  16% {
    -webkit-transform: rotateY(180deg);
  }
  100% {
    -webkit-transform: rotateY(180deg);
  }
}

@-webkit-keyframes spinback {
  0% {
    -webkit-transform: rotateY(180deg);
  }
  16% {
    -webkit-transform: rotateY(0deg);
  }
  100% {
    -webkit-transform: rotateY(0deg);
  }
}

@keyframes spinback {
  0% {
    -webkit-transform: rotateY(180deg);
  }
  16% {
    -webkit-transform: rotateY(0deg);
  }
  100% {
    -webkit-transform: rotateY(0deg);
  }
}

<div id="loader">
  <div id="loader1">
    <div class="inner">
      <div class="front">
      </div>
      <div class="back"> </div>
    </div>
  </div>
  <div id="loader2">
    <div class="inner">
      <div class="front"> </div>
      <div class="back"> </div>
    </div>
  </div>
  <div id="loader3">
    <div class="inner">
      <div class="front"> </div>
      <div class="back"> </div>
    </div>
  </div>
  <div id="loader4">
    <div class="inner">
      <div class="front"> </div>
      <div class="back"> </div>
    </div>
  </div>
  <div id="loader5">
    <div class="inner">
      <div class="front"> </div>
      <div class="back"> </div>
    </div>
  </div>
  <div id="loader6">
    <div class="inner">
      <div class="front"> </div>
      <div class="back"> </div>
    </div>
  </div>
</div>

为了让它更容易理解，我正在尝试应用 css flipcard 方法:

https://www.w3schools.com/howto/howto_css_flip_card.asp

在 div 上，以创建一种正在加载内容的外观...

动画只提供在正确的时间触发关键帧的时间，然后在关键帧中我旋转 div 并等待一段时间，直到其他 div 完成旋转。所以公式是 10 秒内有 6 个盒子，它会介于 (0% 到 100%) 之间，所以 (100/6 = 16,6) 我认为动画应该在动画时间的 16% 结束。

Answer 1

首先，我会简化您的代码并使用更少的 HTML/CSS。然后我会考虑只有一个动画，我将有两种状态。

动画将是:第一次翻转然后我们保持第一种颜色然后第二次翻转然后我们保持第二种颜色。分为12个时隙 (1 + 5 + 1 + 5) (1+5 = 6 div)

如果持续时间是S，那么延迟应该是一个时隙的倍数S/12。请注意，我在转换中使用了透视图以避免额外的元素:

#loader {
  width: 240px;
  height: 100px;
  display: flex;
  flex-wrap: wrap;
}

#loader>div {
  width: calc(100%/3);
  position: relative;
  transform-style: preserve-3d;
  animation: spin 6s linear var(--delay, 0s) infinite;
}

#loader>div:before,
#loader>div:after {
  content: "";
  position: absolute;
  top:0;
  left:0;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  background-color: var(--front, #db9834);
}

#loader>div:after {
  background-color: var(--back, #3498db);
  transform: rotateY(180deg);
}


/* -------------------------------------------------------- */

#loader>div:nth-child(2) {
  --front: #db8834;
  --back: #3488db;
  --delay: 0.5s;
}

#loader>div:nth-child(3) {
  --front: #db7834;
  --back: #3478db;
  --delay: 1s;
}

#loader>div:nth-child(4) {
  --front: #db6834;
  --back: #3468db;
  --delay: 1.5s;
}

#loader>div:nth-child(5) {
  --front: #db5834;
  --back: #3458db;
  --delay: 2s;
}

#loader>div:nth-child(6) {
  --front: #db4834;
  --back: #3448db;
  --delay: 2.5s;
}


@keyframes spin {
  0% {
    transform:perspective(500px) rotateY(0deg);
  }
  8.33%,
  50%{
    transform:perspective(500px) rotateY(180deg);
  }
  58.33% {
    transform:perspective(500px) rotateY(0deg);
  }
}

<div id="loader">
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
</div>

---

有关perspective 和perspective() 之间区别的更多详细信息的相关问题

CSS 3d transform doesn't work if perspective is set in the end of property

perspective and translateZ moves diagonally

---

如果我们在旋转时改变 div 颜色而不是有两个元素，我们可以简化更多。应该在我们进行翻转的位置的一半位置(第一个和第六个)进行更改，没有任何过渡以产生幻觉:

#loader {
  width: 240px;
  height: 100px;
  display: flex;
  flex-wrap: wrap;
}

#loader>div {
  width: calc(100%/3);
  animation: 
    spin   6s linear var(--delay, 0s) infinite,
    colors 6s linear var(--delay, 0s) infinite;
  background-color: var(--front, #db9834);
}


/* -------------------------------------------------------- */

#loader>div:nth-child(2) {
  --front: #db8834;
  --back: #3488db;
  --delay: 0.5s;
}

#loader>div:nth-child(3) {
  --front: #db7834;
  --back: #3478db;
  --delay: 1s;
}

#loader>div:nth-child(4) {
  --front: #db6834;
  --back: #3468db;
  --delay: 1.5s;
}

#loader>div:nth-child(5) {
  --front: #db5834;
  --back: #3458db;
  --delay: 2s;
}

#loader>div:nth-child(6) {
  --front: #db4834;
  --back: #3448db;
  --delay: 2.5s;
}


@keyframes spin {
  0% {
    transform:perspective(500px) rotateY(0deg);
  }
  8.33%,
  50%{
    transform:perspective(500px) rotateY(180deg);
  }
  58.33% {
    transform:perspective(500px) rotateY(0deg);
  }
}
@keyframes colors {
  0%,4.15% {
    background-color: var(--front, #db9834);
  }
  4.16% {
    background-color: var(--back, #3498db);
  }
  54.15% {
    background-color: var(--back, #3498db);
  }
  54.16% {
    background-color: var(--front, #db9834);
  }
}

<div id="loader">
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
</div>

考虑到您希望具有相同的颜色深浅这一事实，可以使用过滤器进行另一种简化:

#loader {
  width: 240px;
  height: 100px;
  display: flex;
  flex-wrap: wrap;
}

#loader>div {
  width: calc(100%/3);
  animation: 
    spin   6s linear var(--delay, 0s) infinite,
    colors 6s linear var(--delay, 0s) infinite;
  background: 
    linear-gradient(#db9834 50%, #3498db 0);
  background-size: 100% 200%;
}


/* -------------------------------------------------------- */

#loader>div:nth-child(2) {
  filter: brightness(0.9);
  --delay: 0.5s;
}

#loader>div:nth-child(3) {
  filter: brightness(0.8);
  --delay: 1s;
}

#loader>div:nth-child(4) {
  filter: brightness(0.7);
  --delay: 1.5s;
}

#loader>div:nth-child(5) {
  filter: brightness(0.6);
  --delay: 2s;
}

#loader>div:nth-child(6) {
  filter: brightness(0.5);
  --delay: 2.5s;
}


@keyframes spin {
  0% {
    transform:perspective(500px) rotateY(0deg);
  }
  8.33%,
  50%{
    transform:perspective(500px) rotateY(180deg);
  }
  58.33% {
    transform:perspective(500px) rotateY(0deg);
  }
}
@keyframes colors {
  4.15% {
    background-position: top;
  }
  4.16%,
  54.15% {
    background-position:bottom;
  }
  54.16% {
    background-position: top;
  }

}

<div id="loader">
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
</div>

此结果与我使用随机过滤器的结果不完全相同，但您可以轻松尝试另一种过滤以获得所需的结果。