GitHub精选 | 使用纯CSS实现动画加载效果

100人浏览 2024-12-09 09:48:53

《GitHub精选》是我们分享Github中优质项目的栏目，包括技术、学习、实用与各种有趣的内容。本期推荐的是一个使用纯CSS实现动画加载效果的项目——SpinKit。

SpinKit通过使用transform和opacity属性实现了包括方块翻转、圆点旋转、圆环缩放和九宫格渐变等10余种动画加载的效果。

部分效果代码：

方块折叠

<div class="sk-folding-cube">
  <div class="sk-cube1 sk-cube"></div>
  <div class="sk-cube2 sk-cube"></div>
  <div class="sk-cube4 sk-cube"></div>
  <div class="sk-cube3 sk-cube"></div>
</div>

.sk-folding-cube {
  margin: 20px auto;
  width: 40px;
  height: 40px;
  position: relative;
  -webkit-transform: rotateZ(45deg);
          transform: rotateZ(45deg);
}

.sk-folding-cube .sk-cube {
  float: left;
  width: 50%;
  height: 50%;
  position: relative;
  -webkit-transform: scale(1.1);
      -ms-transform: scale(1.1);
          transform: scale(1.1); 
}
.sk-folding-cube .sk-cube:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #333;
  -webkit-animation: sk-foldCubeAngle 2.4s infinite linear both;
          animation: sk-foldCubeAngle 2.4s infinite linear both;
  -webkit-transform-origin: 100% 100%;
      -ms-transform-origin: 100% 100%;
          transform-origin: 100% 100%;
}
.sk-folding-cube .sk-cube2 {
  -webkit-transform: scale(1.1) rotateZ(90deg);
          transform: scale(1.1) rotateZ(90deg);
}
.sk-folding-cube .sk-cube3 {
  -webkit-transform: scale(1.1) rotateZ(180deg);
          transform: scale(1.1) rotateZ(180deg);
}
.sk-folding-cube .sk-cube4 {
  -webkit-transform: scale(1.1) rotateZ(270deg);
          transform: scale(1.1) rotateZ(270deg);
}
.sk-folding-cube .sk-cube2:before {
  -webkit-animation-delay: 0.3s;
          animation-delay: 0.3s;
}
.sk-folding-cube .sk-cube3:before {
  -webkit-animation-delay: 0.6s;
          animation-delay: 0.6s; 
}
.sk-folding-cube .sk-cube4:before {
  -webkit-animation-delay: 0.9s;
          animation-delay: 0.9s;
}
@-webkit-keyframes sk-foldCubeAngle {
  0%, 10% {
    -webkit-transform: perspective(140px) rotateX(-180deg);
            transform: perspective(140px) rotateX(-180deg);
    opacity: 0; 
  } 25%, 75% {
    -webkit-transform: perspective(140px) rotateX(0deg);
            transform: perspective(140px) rotateX(0deg);
    opacity: 1; 
  } 90%, 100% {
    -webkit-transform: perspective(140px) rotateY(180deg);
            transform: perspective(140px) rotateY(180deg);
    opacity: 0; 
  } 
}

@keyframes sk-foldCubeAngle {
  0%, 10% {
    -webkit-transform: perspective(140px) rotateX(-180deg);
            transform: perspective(140px) rotateX(-180deg);
    opacity: 0; 
  } 25%, 75% {
    -webkit-transform: perspective(140px) rotateX(0deg);
            transform: perspective(140px) rotateX(0deg);
    opacity: 1; 
  } 90%, 100% {
    -webkit-transform: perspective(140px) rotateY(180deg);
            transform: perspective(140px) rotateY(180deg);
    opacity: 0; 
  }
}

三点渐变

<div class="spinner">
  <div class="bounce1"></div>
  <div class="bounce2"></div>
  <div class="bounce3"></div>
</div>

.spinner {
  margin: 100px auto 0;
  width: 70px;
  text-align: center;
}

.spinner > div {
  width: 18px;
  height: 18px;
  background-color: #333;

  border-radius: 100%;
  display: inline-block;
  -webkit-animation: sk-bouncedelay 1.4s infinite ease-in-out both;
  animation: sk-bouncedelay 1.4s infinite ease-in-out both;
}

.spinner .bounce1 {
  -webkit-animation-delay: -0.32s;
  animation-delay: -0.32s;
}

.spinner .bounce2 {
  -webkit-animation-delay: -0.16s;
  animation-delay: -0.16s;
}

@-webkit-keyframes sk-bouncedelay {
  0%, 80%, 100% { -webkit-transform: scale(0) }
  40% { -webkit-transform: scale(1.0) }
}

@keyframes sk-bouncedelay {
  0%, 80%, 100% { 
    -webkit-transform: scale(0);
    transform: scale(0);
  } 40% { 
    -webkit-transform: scale(1.0);
    transform: scale(1.0);
  }
}