Question

我用CSS动画做了一个呼吸圈。

Circle Expanding = "Breath In"

Circle Retains Size = "Hold"

Circle Shrinks = "Breath Out"

一旦圆圈达到动画的100％，我希望内容切换到＆＃34;呼出＆＃34;它永远不会。如何从＃34; Hold＆＃34;切换内容？到＃34;呼出＆＃34;？

＆＃13;

 @import "compass/css3";

  .circle {
    background: purple;
    width: 500px;
    height: 500px;
    margin: auto;
    border-radius: 100%;
    overflow: hidden;
    -webkit-animation: grow 5s 1;
    animation-iteration-count:infinite;
    text-align: center;
    display: block;
    line-height: 450px;
    font-size: 60px;
  }

  .text::before {
    -webkit-animation: grow 5s 1;
    animation-iteration-count:infinite;
    content: '';
  }

@-webkit-keyframes grow {
    0% {
      -webkit-transform: scale( .5);
      -moz-transform: scale( .5);
      -o-transform: scale( .5);
      -ms-transform: scale( .5);
      transform: scale( .5);
      content: 'Breath In';
    }

    40% {
      -webkit-transform: scale( 1);
      -moz-transform: scale( 1);
      -o-transform: scale( 1);
      -ms-transform: scale( 1);
      transform: scale( 1);
    }

    60% {
      -webkit-transform: scale( 1);
      -moz-transform: scale( 1);
      -o-transform: scale( 1);
      -ms-transform: scale( 1);
      transform: scale( 1);
      content: 'Hold';
    }

    100% {
      -webkit-transform: scale( 0.5);
      -moz-transform: scale( 0.5);
      -o-transform: scale( 0.5);
      -ms-transform: scale( 0.5);
      transform: scale( 0.5);
      content: 'Breath out';
    }
  }

＆＃13;

<div class="circle">
    <div class="text"></div>
</div>

＆＃13;

http://jsfiddle.net/gh9xtu6q/2/

Answer 1

我认为这是因为你已经为主元素和伪元素定义了相同的动画，这就产生了一个问题。相反，您应该将缩放动画保留在主元素上，将内容动画保留在伪元素上。

您已定义仅包含前缀-webkit-的动画，您应将其删除

＆＃13;

.circle {
  background: purple;
  width: 500px;
  height: 500px;
  margin: auto;
  border-radius: 100%;
  overflow: hidden;
  animation: grow 5s 1;
  animation-iteration-count: infinite;
  text-align: center;
  display: block;
  line-height: 450px;
  font-size: 60px;
}

.text::before {
  animation: grow-content 5s 1;
  animation-iteration-count: infinite;
  content: '';
}

@keyframes grow {
  0% {
    
    transform: scale( 0.5);
  }
  40% {
    transform: scale( 1);
  }
  60% {
    transform: scale( 1);
  }
  100% {
    transform: scale( 0.5);
  }
}

@keyframes grow-content {
  0%, 40% {
    content: 'Breath In';
  }
  41%, 60% {
    content: 'Hold';
  }
  61%, 100% {
    content: 'Breath out';
  }
}

＆＃13;

<div class="circle">
  <div class="text"></div>
</div>

＆＃13;

Answer 2

您可以使用<span>标记而不是伪元素添加文本。这是一个更多的CSS，但它会让你更多地控制时间，并使其更容易转换其他属性（颜色，位置等）。

fiddle

@import "compass/css3";
.circle {
  background: purple;
  width: 500px;
  height: 500px;
  margin: auto;
  border-radius: 100%;
  overflow: hidden;
  animation: grow 5s 1;
  animation-iteration-count: infinite;
  display: flex;
  justify-content: center;
  align-items: center;
}

.text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: white;
  font-size: 60px;
  font-family: sans-serif;
  animation: changeText 5s;
}

.text span {
  position: absolute;
  left: 0;
  right: 0;
  text-align: center;
}

.text-in,
.text-hold,
.text-out {
  opacity: 0;
}

.text-in {
  animation: breatheIn 5s infinite;
}

.text-hold {
  animation: breatheHold 5s infinite;
}

.text-out {
  animation: breatheOut 5s infinite;
}

@keyframes breatheIn {
  0% {
    opacity: 0;
  }
  15% {
    opacity: 1;
  }
  30% {
    opacity: 1;
  }
  35% {
    opacity: 0;
  }
}

@keyframes breatheHold {
  0% {
    opacity: 0;
  }
  35% {
    opacity: 0;
  }
  40% {
    opacity: 1;
  }
  55% {
    opacity: 1;
  }
  60% {
    opacity: 0;
  }
}

@keyframes breatheOut {
  0% {
    opacity: 0;
  }
  60% {
    opacity: 0;
  }
  73% {
    opacity: 1;
  }
}

@-webkit-keyframes grow {
  0% {
    -webkit-transform: scale( .5);
    -moz-transform: scale( .5);
    -o-transform: scale( .5);
    -ms-transform: scale( .5);
    transform: scale( .5);
  }
  40% {
    -webkit-transform: scale( 1);
    -moz-transform: scale( 1);
    -o-transform: scale( 1);
    -ms-transform: scale( 1);
    transform: scale( 1);
  }
  60% {
    -webkit-transform: scale( 1);
    -moz-transform: scale( 1);
    -o-transform: scale( 1);
    -ms-transform: scale( 1);
    transform: scale( 1);
  }
  100% {
    -webkit-transform: scale( 0.5);
    -moz-transform: scale( 0.5);
    -o-transform: scale( 0.5);
    -ms-transform: scale( 0.5);
    transform: scale( 0.5);
  }
}

<div class="circle">
  <div class="text">
    <span class="text-in">Breath In</span>
    <span class="text-hold">Hold</span>
    <span class="text-out">Breath Out</span>
  </div>
</div>

CSS3改变动画中的内容

2 个答案: