效果预览

源代码地址

https://github.com/shanyuhai123/learnCSS/tree/master/0159-halloween-switcher

代码解读

定义容器 halloween-switcher , 通过 checkbox 来实现切换

<section class="halloween-switcher">
 <input type="checkbox" id="halloween-input">
 <label for="switch-input" class="halloween-label">
 <div class="pumpkin-container"></div>
 <div class="vampire-container"></div>
 </label>
</section>

引入字体, 居中显示:

@import url('https://fonts.googleapis.com/css?family=Kodchasan');

* {
 font-family: 'Kodchasan';
}

html {
 font-size: 20px;
}

body {
 width: 100vw;
 height: 100vh;
 display: flex;
 align-items: center;
 justify-content: center;
 background: #081219;
 overflow: hidden;
}

设置实际容器 label 大小

.halloween-label {
 width: 30rem;
 height: 10rem;
 border: 3px solid #E56D48;
 border-radius: 10rem;
 cursor: pointer;
 display: flex;
 align-items: center;
 position: relative;
}

增加两种容器的配色

html {
 --pumpkin-color: #E56D48;
 --vampire-color: #4D7C99;
}

定义 pumpkin-container , vampire-container 容器 及 文字

.halloween-input ~ .halloween-label::before,
.halloween-input:checked ~ .halloween-label::before {
 position: absolute;
 font-size: 2.5rem;
 text-transform: uppercase;
}
.halloween-input ~ .halloween-label::before {
 content: 'Pumpkin';
 color: var(--pumpkin-color);
 left: 70%;
 transform: translateX(-70%);
}
.halloween-input:checked ~ .halloween-label::before {
 content: 'Vampire';
 color: var(--vampire-color);
 left: 25%;
 transform: translateX(-25%);
}

.halloween-input ~ .halloween-label .pumpkin-container,
.halloween-input ~ .halloween-label .vampire-container {
 width: 9.5rem;
 height: 9.5rem;
 border-radius: 50%;
 position: absolute;
 left: 0.25rem;
 overflow: hidden;
}
.halloween-input ~ .halloween-label .pumpkin-container {
 background-color: var(--pumpkin-color);
 filter: opacity(1);
}
.halloween-input ~ .halloween-label .vampire-container {
 background-color: var(--vampire-color);
 filter: opacity(0);
}
.halloween-input:checked ~ .halloween-label .pumpkin-container {
 left: calc(100% - 0.25rem);
 transform: translateX(-100%);
 filter: opacity(0);
}
.halloween-input:checked ~ .halloween-label .vampire-container {
 left: calc(100% - 0.25rem);
 transform: translateX(-100%);
 filter: opacity(1);
}

增加 label容器 颜色渐变

.halloween-label {
 border: 3px solid var(--label-border-color);
 transition: .5s ease-in-out;
}
.halloween-label {
 --label-border-color: var(--pumpkin-color);
}
.halloween-input:checked ~ .halloween-label {
 --label-border-color: var(--vampire-color);
}

pumpkin-container , vampire-container 容器 及 文字

动画效果

.halloween-input ~ .halloween-label::before,
.halloween-input:checked ~ .halloween-label::before {
 transition: .5s ease;
}
.halloween-input ~ .halloween-label .pumpkin-container,
.halloween-input ~ .halloween-label .vampire-container {
 transition: .5s ease;
}

先绘画 pumpkin , 补全 pumpkin-container

<p class="pumpkin-container">
 <p class="pumpkin__eyes-n-nose"></p>
 <p class="pumpkin__mouth-n-teeths"></p>
</p>

新增果肉颜色

html {
 --pumkin-pulp-color: #330A0F;
}

绘画 pumpkin 的 pumpkin__eyes-n-nose

伪元素画出眼睛

.pumpkin__eyes-n-nose {
 position: absolute;
 top: 20%;
 width: 0;
 height: 0;
 border-style: solid;
 border-width: 0 0.8rem 1.6rem 0.8rem;
 color: var(--pumpkin-color);
 border-bottom-color: var(--pumkin-pulp-color);
 background-color: var(--pumkin-pulp-color);
}
.pumpkin__eyes-n-nose::before,
.pumpkin__eyes-n-nose::after {
 content: '';
 position: absolute;
 width: 1rem;
 height: 1rem;
 background-color: var(--pumkin-pulp-color);
 border-radius: 50%;
 top: 0.5rem;
 left: 0;
}
.pumpkin__eyes-n-nose::before {
 margin-left: -3.25rem;
}
.pumpkin__eyes-n-nose::after {
 margin-left: 2.25rem;
}

绘画 pumpkin 的 pumpkin__mouth-n-teeths

伪元素画出牙齿

.pumpkin__mouth-n-teeths {
 position: absolute;
 width: 6.5rem;
 height: 3.25rem;
 bottom: 10%;
 background-color: var(--pumkin-pulp-color);
 border-radius: 0 0 6.5rem 6.5rem;
}
.pumpkin__mouth-n-teeths::before,
.pumpkin__mouth-n-teeths::after {
 content: '';
 position: absolute;
 height: 0.75rem;
 width: 1rem;
 background-color: var(--pumpkin-color);
}
.pumpkin__mouth-n-teeths::before {
 top: 0;
 left: 1.25rem;
}
.pumpkin__mouth-n-teeths::after {
 height: 1rem;
 bottom: 0;
 right: 1.25rem;
}

再绘画 vampire , 补全 vampire-container

<p class="vampire-container">
 <p class="vampire__eyes"></p>
 <p class="vampire__mouth">
 <p class="vampire__teeths"></p>
 <p class="vampire__tongue"></p>
 </p>
</p>

利用 伪元素 绘出 vampire-container 的脸

.vampire-container::before,
.vampire-container::after {
 content: '';
 position: absolute;
 width: 100%;
 height: 100%;
 background-color: #c2def2; /* face color */
 border-radius: 45% 45% 0 0;
 top: 0.75rem;
}
.vampire-container::before {
 left: -4rem;
}
.vampire-container::after {
 right: -4rem;
}

伪元素绘出 vampire__eyes

.vampire__eyes {
 top: 20%;
 position: absolute;
 z-index: 1;
}
.vampire__eyes::before,
.vampire__eyes::after {
 content: '';
 position: absolute;
 width: 1rem;
 height: 1rem;
 background-color: #d63e49; /* eye-color */
 border-radius: 50%;
 top: 0.5rem;
 left: 0;
}
.vampire__eyes::before {
 margin-left: -3.25rem;
}
.vampire__eyes::after {
 margin-left: 2.25rem;
}

绘出 vampire__mouth

.vampire__mouth {
 position: absolute;
 width: 6.5rem;
 height: 3.25rem;
 background-color: var(--pumkin-pulp-color);
 bottom: 10%;
 border-radius: 0 0 6.5rem 6.5rem;
 display: flex;
 justify-content: center;
 overflow: hidden;
 z-index: 1;
}

绘出 vampire__teeths 门牙, 伪元素绘出牙齿

.vampire__teeths {
 position: absolute;
 width: 100%;
 height: 1rem;
 background-color: #fffae6;
 top: -1px;
}
.vampire__teeths::before,
.vampire__teeths::after {
 content: '';
 position: absolute;
 width: 0;
 height: 0;
 color: transparent;
 border-style: solid;
 border-width: 0.65rem 0.375rem 0 0.375rem;
 border-top-color: #fffae6;
 top: 0.95rem;
}
.vampire__teeths::before {
 left: 1rem;
}
.vampire__teeths::after {
 right: 1rem;
}

绘出 vampire__tongue

.vampire__tongue {
 position: absolute;
 width: 3.5rem;
 height: 1.75rem;
 background-color: #d63e49;
 bottom: -0.75rem;
 border-radius: 3.5rem 3.5rem 0 0;
}

再接着把 checkbox 隐藏掉即可

.halloween-input {
 display: none;
}

增加微笑动画 smile

.vampire__teeths {
 animation: smile 2s ease-in-out infinite;
}
.vampire__tongue {
 animation: smile 3s ease-in-out infinite;
}
@keyframes smile {
 50% {
 transform: scaleY(1.5);
 }
}