如何使用 HTML & CSS 创建旋转效果？

Question

我需要那个方块悬停的旋转效果，我能得到的是下面写的。

HTML

<div class="mainSquare">
  <div class="firstInnerSquare">
    <div class="lastInnerSquare">
      Hello
    </div>
  </div>
</div>

CSS

.mainSquare{
  width:160px;
  height:160px;
  background:black;
  margin: 50px auto;
  padding:25px;
}
.firstInnerSquare{
  width:110px;
  height:110px;
  background:red;
  padding:25px;
}
.lastInnerSquare{
  text-align:center;
  width:110px;
  padding: 46px 0px;
  background:white;
}

Fiddle

希望得到帮助。

Answer 1

您可以使用一个元素和两个伪元素来做到这一点。使 2 个伪元素大于容器元素，将它们放在容器后面并为它们添加 rotate 动画。

注意：这只是一个可以帮助您入门的基本示例。我会把微调部分留给你处理。您可以在 this MDN page.

中阅读有关 CSS 动画属性的更多信息

.shape {
  position: relative; /* used to position the pseudos relative to the parent */
  height: 100px;
  width: 100px;
  background: white;
  border: 1px solid;
  margin: 100px; /* required because children are larger than parent */
}
.shape:after,
.shape:before {
  position: absolute;
  content: '';
}
.shape:before {
  height: 125%; /* make one pseudo 25% larger than parent */
  width: 125%;
  top: -12.5%; /* 25/2 to make sure its center is same as the parent's */
  left: -12.5%; /* 25/2 to make sure its center is same as the parent's */
  background: red;
  z-index: -1; /* send it behind the parent */
}
.shape:after {
  height: 150%; /* make this pseudo larger than the parent and the other pseudo */
  width: 150%;
  top: -25%; /* 50/2 to make sure its center is same as the parent's */
  left: -25%; /* 50/2 to make sure its center is same as the parent's */
  background: black;
  z-index: -2; /* send it behind both the parent and other pseudo */
}

/* add animation when hovering on parent */
.shape:hover:before { 
  animation: rotate 3s linear infinite;
}
.shape:hover:after {
  animation: rotate-rev 3s linear infinite;
}
@keyframes rotate {
  to {
    transform: rotate(359deg); /* some browsers don't display spin when it is 360 deg */
  }
}
@keyframes rotate-rev {
  to {
    transform: rotate(-359deg); /* reverse direction rotate */
  }
}

<div class='shape'></div>

Answer 2

这是一个原始结构和一个关键帧语句：

所有需要更改的是动画持续时间和方向，per div。 "middle" div 的时间需要是 outer/inner.

的 50%

.mainSquare {
  width: 160px;
  height: 160px;
  background: black;
  margin: 50px auto;
  padding: 25px;
  animation: spin 2s infinite linear;
}
.firstInnerSquare {
  width: 110px;
  height: 110px;
  background: red;
  padding: 25px;
  animation: spin 1s infinite linear reverse;
}
.lastInnerSquare {
  text-align: center;
  width: 110px;
  padding: 46px 0px;
  background: white;
  animation: spin 2s infinite linear;
}
@keyframes spin {
  to {
    transform: rotate(1turn);
  }
}

<div class="mainSquare">
  <div class="firstInnerSquare">
    <div class="lastInnerSquare">
      Hello
    </div>
  </div>
</div>

如何使用 HTML & CSS 创建旋转效果？

How to create spin effect using HTML & CSS?

html

css

css-animations

css-shapes