CSS卡片选中切换UI动画特效代码

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这是一款纯css实现的卡片选中ui特效代码，用户点击卡片时，会以动画的形式，取消或选中卡片。

使用方法：

1.将卡内容与复选框和自定义（SVG）一起插入到一个标签元素中，如下所示：

<label class="card">
  <input class="card__input" type="checkbox"/>
  <div class="card__body">
    <div class="card__body-cover">
      <img class="card__body-cover-image" src="cover.png"/>
      <span class="card__body-cover-checkbox"> 
        <svg class="card__body-cover-checkbox--svg" viewBox="0 0 12 10">
          <polyline points="1.5 6 4.5 9 10.5 1"></polyline>
        </svg>
      </span>
    </div>
    <header class="card__body-header">
      <h2 class="card__body-header-title">Card Title</h2>
      <p class="card__body-header-subtitle">Sub Title</p>
    </header>
  </div>
</label>

2.核心CSS样式。

.card {
  --background: #fff;
  --background-checkbox: #0082ff;
  --background-image: #fff, rgba(0, 107, 175, 0.2);
  --text-color: #666;
  --text-headline: #000;
  --card-shadow: #0082ff;
  --card-height: 190px;
  --card-width: 190px;
  --card-radius: 12px;
  --header-height: 47px;
  --blend-mode: overlay;
  --transition: 0.15s;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.card:nth-child(odd) .card__body-cover-image {
  --x-y1: 100% 90%;
  --x-y2: 67% 83%;
  --x-y3: 33% 90%;
  --x-y4: 0% 85%;
}

.card:nth-child(even) .card__body-cover-image {
  --x-y1: 100% 85%;
  --x-y2: 73% 93%;
  --x-y3: 25% 85%;
  --x-y4: 0% 90%;
}

.card__body {
  display: grid;
  grid-auto-rows: calc(var(--card-height) - var(--header-height)) auto;
  background: var(--background);
  height: var(--card-height);
  width: var(--card-width);
  border-radius: var(--card-radius);
  overflow: hidden;
  position: relative;
  cursor: pointer;
  box-shadow: var(--shadow, 0 4px 4px 0 rgba(0, 0, 0, 0.02));
  -webkit-transition: box-shadow var(--transition), -webkit-transform var(--transition);
  transition: box-shadow var(--transition), -webkit-transform var(--transition);
  transition: transform var(--transition), box-shadow var(--transition);
  transition: transform var(--transition), box-shadow var(--transition), -webkit-transform var(--transition);
  -webkit-transform: scale(var(--scale, 1)) translateZ(0);
  transform: scale(var(--scale, 1)) translateZ(0);
}

.card__body:active {
  --scale: 0.96;
}

.card__body-cover {
  --c-border: var(--card-radius) var(--card-radius) 0 0;
  --c-width: 100%;
  --c-height: 100%;
  position: relative;
  overflow: hidden;
}

.card__body-cover:after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: var(--c-width);
  height: var(--c-height);
  border-radius: var(--c-border);
  background: -webkit-gradient(linear, left top, right bottom, from(var(--background-image)));
  background: linear-gradient(to bottom right, var(--background-image));
  mix-blend-mode: var(--blend-mode);
  opacity: var(--opacity-bg, 1);
  -webkit-transition: opacity var(--transition) linear;
  transition: opacity var(--transition) linear;
}

.card__body-cover-image {
  width: var(--c-width);
  height: var(--c-height);
  -o-object-fit: cover;
  object-fit: cover;
  border-radius: var(--c-border);
  -webkit-filter: var(--filter-bg, grayscale(1));
  filter: var(--filter-bg, grayscale(1));
  -webkit-clip-path: polygon(0% 0%, 100% 0%, var(--x-y1, 100% 90%), var(--x-y2, 67% 83%), var(--x-y3, 33% 90%), var(--x-y4, 0% 85%));
  clip-path: polygon(0% 0%, 100% 0%, var(--x-y1, 100% 90%), var(--x-y2, 67% 83%), var(--x-y3, 33% 90%), var(--x-y4, 0% 85%));
}

.card__body-header {
  height: var(--header-height);
  background: var(--background);
  padding: 0 10px 10px 10px;
}

.card__body-header-title {
  color: var(--text-headline);
  font-weight: 700;
  margin-bottom: 8px;
}

.card__body-header-subtitle {
  color: var(--text-color);
  font-weight: 500;
  font-size: 13px;
}

3.check，uncheck交互样式

.card__input {
  position: absolute;
  display: block;
  outline: none;
  border: none;
  background: none;
  padding: 0;
  margin: 0;
  -webkit-appearance: none;
}

.card__input:checked ~ .card__body {
  --shadow: 0 0 0 3px var(--card-shadow);
}

.card__input:checked ~ .card__body .card__body-cover-checkbox {
  --check-bg: var(--background-checkbox);
  --check-border: #fff;
  --check-scale: 1;
  --check-opacity: 1;
}

.card__input:checked ~ .card__body .card__body-cover-checkbox--svg {
  --stroke-color: #fff;
  --stroke-dashoffset: 0;
}

.card__input:checked ~ .card__body .card__body-cover:after {
  --opacity-bg: 0;
}

.card__input:checked ~ .card__body .card__body-cover-image {
  --filter-bg: grayscale(0);
}

.card__input:disabled ~ .card__body {
  cursor: not-allowed;
  opacity: 0.5;
}

.card__input:disabled ~ .card__body:active {
  --scale: 1;
}

.card__body-cover-checkbox {
  background: var(--check-bg, var(--background-checkbox));
  border: 2px solid var(--check-border, #fff);
  position: absolute;
  right: 10px;
  top: 10px;
  z-index: 1;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  opacity: var(--check-opacity, 0);
  transition: transform var(--transition), opacity calc(var(--transition) * 1.2) linear, -webkit-transform var(--transition) ease;
  -webkit-transform: scale(var(--check-scale, 0));
  transform: scale(var(--check-scale, 0));
}

.card__body-cover-checkbox--svg {
  width: 13px;
  height: 11px;
  display: inline-block;
  vertical-align: top;
  fill: none;
  margin: 7px 0 0 5px;
  stroke: var(--stroke-color, #fff);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 16px;
  stroke-dashoffset: var(--stroke-dashoffset, 16px);
  -webkit-transition: stroke-dashoffset 0.4s ease var(--transition);
  transition: stroke-dashoffset 0.4s ease var(--transition);
}

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