MIUI選項框開關樣式模擬

有IOS的開關模擬，當然也有MIUI的開關模擬

看到設定選項裡面的開關樣式，突發奇想地來試試

  

 

最終效果如圖：

 

 

實現過程

1. 選項框checkbox 

模擬開關當然需要一個選項框，這裡用到了複選框checkbox

2. 理解開關的過程

點選開關按鈕，則開啟或關閉。原生的checkbox無法做到圖示的效果，所以就需要額外的元素來表示圖中的開關

而我們又要使用到checkbox的點擊效果以及點擊後是否選中（checked）的效果，所以checkbox不能隱藏，但可以用覆蓋的方式

為了減少多餘標籤的使用，可以使用偽元素:before、:after ，標籤結構為

<span style="color: #0000ff;">　　<</span><span style="color: #800000;">div </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="switch-wrap"</span><span style="color: #0000ff;">></span>
        <span style="color: #0000ff;"><</span><span style="color: #800000;">span</span><span style="color: #0000ff;">><</span><span style="color: #800000;">span </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="switch-action"</span><span style="color: #0000ff;">></span>开启<span style="color: #0000ff;"></</span><span style="color: #800000;">span</span><span style="color: #0000ff;">></span>WLAN<span style="color: #0000ff;"></</span><span style="color: #800000;">span</span><span style="color: #0000ff;">></span>
        <span style="color: #0000ff;"><</span><span style="color: #800000;">label </span><span style="color: #ff0000;">class</span><span style="color: #0000ff;">="switch"</span><span style="color: #0000ff;">></span>
            <span style="color: #0000ff;"><</span><span style="color: #800000;">input </span><span style="color: #ff0000;">type</span><span style="color: #0000ff;">="checkbox"</span><span style="color: #ff0000;"> name</span><span style="color: #0000ff;">="switch"</span><span style="color: #ff0000;"> id</span><span style="color: #0000ff;">="switch"</span><span style="color: #0000ff;">></span>
        <span style="color: #0000ff;"></</span><span style="color: #800000;">label</span><span style="color: #0000ff;">></span>
    <span style="color: #0000ff;"></</span><span style="color: #800000;">div</span><span style="color: #0000ff;">></span>

3. 開關的實現

用:before偽元素作為開關背景層，用:after偽元素作為開關項（即那個小圓圈）

<span style="color: #800000;">        .switch input:before </span>{<span style="color: #ff0000;">
            content</span>:<span style="color: #0000ff;"> ''</span>;<span style="color: #ff0000;">
            display</span>:<span style="color: #0000ff;"> inline-block</span>;<span style="color: #ff0000;">
            position</span>:<span style="color: #0000ff;"> relative</span>;<span style="color: #ff0000;">
            border-radius</span>:<span style="color: #0000ff;"> 20px</span>;<span style="color: #ff0000;">
            border</span>:<span style="color: #0000ff;"> 1px solid #ccccc6</span>;<span style="color: #ff0000;">
            box-shadow</span>:<span style="color: #0000ff;"> 0 0 1px 1px #ececf3</span>;<span style="color: #ff0000;">
            background-color</span>:<span style="color: #0000ff;"> #fff</span>;<span style="color: #ff0000;">
            cursor</span>:<span style="color: #0000ff;"> pointer</span>;
        }

<span style="color: #800000;">        .switch input:after </span>{<span style="color: #ff0000;">
            content</span>:<span style="color: #0000ff;"> ''</span>;<span style="color: #ff0000;">
            position</span>:<span style="color: #0000ff;"> absolute</span>;<span style="color: #ff0000;">
            width</span>:<span style="color: #0000ff;"> 12px</span>;<span style="color: #ff0000;">
            height</span>:<span style="color: #0000ff;"> 12px</span>;<span style="color: #ff0000;">
            top</span>:<span style="color: #0000ff;"> 2px</span>;<span style="color: #ff0000;">
            left</span>:<span style="color: #0000ff;"> 3px</span>;<span style="color: #ff0000;">
            border-radius</span>:<span style="color: #0000ff;"> 50%</span>;<span style="color: #ff0000;">
            background-color</span>:<span style="color: #0000ff;"> #ccccc6</span>;<span style="color: #ff0000;">
            transition</span>:<span style="color: #0000ff;"> .2s left, .2s background-color</span>;
        }

初始小圓圈在左側，當開關狀態為開啟時，右移，並更新開啟狀態的背景色

<span style="color: #800000;">        .switch input:checked:after </span>{<span style="color: #ff0000;">
            left</span>:<span style="color: #0000ff;"> 15px</span>;<span style="color: #ff0000;">
            background-color</span>:<span style="color: #0000ff;"> #36a6fa</span>;<span style="color: #ff0000;">
            transition</span>:<span style="color: #0000ff;"> .2s left, .2s background-color</span>;
        }

 

以上就是關鍵的程式碼了，以下為完整的樣式

<span style="color: #008080;"> 1</span> <span style="color: #800000;"><style>
</span><span style="color: #008080;"> 2</span> <span style="color: #800000;">    .switch-wrap </span>{
<span style="color: #008080;"> 3</span> <span style="color: #ff0000;">            position</span>:<span style="color: #0000ff;"> relative</span>;
<span style="color: #008080;"> 4</span> <span style="color: #ff0000;">            margin</span>:<span style="color: #0000ff;"> 50px auto</span>;
<span style="color: #008080;"> 5</span> <span style="color: #ff0000;">            width</span>:<span style="color: #0000ff;"> 120px</span>;
<span style="color: #008080;"> 6</span> <span style="color: #ff0000;">            height</span>:<span style="color: #0000ff;"> 40px</span>;
<span style="color: #008080;"> 7</span> <span style="color: #ff0000;">            font</span>:<span style="color: #0000ff;"> 14px/1.5 Arial, Sans-Serif</span>;
<span style="color: #008080;"> 8</span>         }
<span style="color: #008080;"> 9</span> 
<span style="color: #008080;">10</span> <span style="color: #800000;">        .switch,
</span><span style="color: #008080;">11</span> <span style="color: #800000;">        .switch input,
</span><span style="color: #008080;">12</span> <span style="color: #800000;">        .switch input:before </span>{
<span style="color: #008080;">13</span> <span style="color: #ff0000;">            width</span>:<span style="color: #0000ff;"> 30px</span>;
<span style="color: #008080;">14</span> <span style="color: #ff0000;">            height</span>:<span style="color: #0000ff;"> 14px</span>;
<span style="color: #008080;">15</span>         }
<span style="color: #008080;">16</span> 
<span style="color: #008080;">17</span> <span style="color: #800000;">        .switch input </span>{
<span style="color: #008080;">18</span> <span style="color: #ff0000;">            position</span>:<span style="color: #0000ff;"> absolute</span>;
<span style="color: #008080;">19</span> <span style="color: #ff0000;">            right</span>:<span style="color: #0000ff;"> 0</span>;
<span style="color: #008080;">20</span>         }
<span style="color: #008080;">21</span> 
<span style="color: #008080;">22</span> <span style="color: #800000;">        .switch input:before </span>{
<span style="color: #008080;">23</span> <span style="color: #ff0000;">            content</span>:<span style="color: #0000ff;"> ''</span>;
<span style="color: #008080;">24</span> <span style="color: #ff0000;">            display</span>:<span style="color: #0000ff;"> inline-block</span>;
<span style="color: #008080;">25</span> <span style="color: #ff0000;">            position</span>:<span style="color: #0000ff;"> relative</span>;
<span style="color: #008080;">26</span> <span style="color: #ff0000;">            border-radius</span>:<span style="color: #0000ff;"> 20px</span>;
<span style="color: #008080;">27</span> <span style="color: #ff0000;">            border</span>:<span style="color: #0000ff;"> 1px solid #ccccc6</span>;
<span style="color: #008080;">28</span> <span style="color: #ff0000;">            box-shadow</span>:<span style="color: #0000ff;"> 0 0 1px 1px #ececf3</span>;
<span style="color: #008080;">29</span> <span style="color: #ff0000;">            background-color</span>:<span style="color: #0000ff;"> #fff</span>;
<span style="color: #008080;">30</span> <span style="color: #ff0000;">            cursor</span>:<span style="color: #0000ff;"> pointer</span>;
<span style="color: #008080;">31</span>         }
<span style="color: #008080;">32</span> 
<span style="color: #008080;">33</span> <span style="color: #800000;">        .switch input:after </span>{
<span style="color: #008080;">34</span> <span style="color: #ff0000;">            content</span>:<span style="color: #0000ff;"> ''</span>;
<span style="color: #008080;">35</span> <span style="color: #ff0000;">            position</span>:<span style="color: #0000ff;"> absolute</span>;
<span style="color: #008080;">36</span> <span style="color: #ff0000;">            width</span>:<span style="color: #0000ff;"> 12px</span>;
<span style="color: #008080;">37</span> <span style="color: #ff0000;">            height</span>:<span style="color: #0000ff;"> 12px</span>;
<span style="color: #008080;">38</span> <span style="color: #ff0000;">            top</span>:<span style="color: #0000ff;"> 2px</span>;
<span style="color: #008080;">39</span> <span style="color: #ff0000;">            left</span>:<span style="color: #0000ff;"> 3px</span>;
<span style="color: #008080;">40</span> <span style="color: #ff0000;">            border-radius</span>:<span style="color: #0000ff;"> 50%</span>;
<span style="color: #008080;">41</span> <span style="color: #ff0000;">            background-color</span>:<span style="color: #0000ff;"> #ccccc6</span>;
<span style="color: #008080;">42</span> <span style="color: #ff0000;">            transition</span>:<span style="color: #0000ff;"> .2s left, .2s background-color</span>;
<span style="color: #008080;">43</span>         }
<span style="color: #008080;">44</span> 
<span style="color: #008080;">45</span> <span style="color: #800000;">        .switch input:checked:after </span>{
<span style="color: #008080;">46</span> <span style="color: #ff0000;">            left</span>:<span style="color: #0000ff;"> 15px</span>;
<span style="color: #008080;">47</span> <span style="color: #ff0000;">            background-color</span>:<span style="color: #0000ff;"> #36a6fa</span>;
<span style="color: #008080;">48</span> <span style="color: #ff0000;">            transition</span>:<span style="color: #0000ff;"> .2s left, .2s background-color</span>;
<span style="color: #008080;">49</span>         }
<span style="color: #008080;">50</span> 
<span style="color: #008080;">51</span> 
<span style="color: #008080;">52</span> <span style="color: #800000;">    </style></span>

完整CSS代碼

 

4. 開關的測試

最後，可結合JS偵測一下開關的狀態變化

    <span style="color: #0000ff;"><</span><span style="color: #800000;">script </span><span style="color: #ff0000;">src</span><span style="color: #0000ff;">="jquery.js"</span><span style="color: #0000ff;">></</span><span style="color: #800000;">script</span><span style="color: #0000ff;">></span>
    <span style="color: #0000ff;"><</span><span style="color: #800000;">script </span><span style="color: #ff0000;">type</span><span style="color: #0000ff;">="text/javascript"</span><span style="color: #0000ff;">></span><span style="background-color: #f5f5f5; color: #000000;">
        $(</span><span style="background-color: #f5f5f5; color: #000000;">'</span><span style="background-color: #f5f5f5; color: #000000;">#switch</span><span style="background-color: #f5f5f5; color: #000000;">'</span><span style="background-color: #f5f5f5; color: #000000;">).change(</span><span style="background-color: #f5f5f5; color: #0000ff;">function</span><span style="background-color: #f5f5f5; color: #000000;">() {
            $(</span><span style="background-color: #f5f5f5; color: #000000;">'</span><span style="background-color: #f5f5f5; color: #000000;">.switch-action</span><span style="background-color: #f5f5f5; color: #000000;">'</span><span style="background-color: #f5f5f5; color: #000000;">).text(</span><span style="background-color: #f5f5f5; color: #0000ff;">this</span><span style="background-color: #f5f5f5; color: #000000;">.checked </span><span style="background-color: #f5f5f5; color: #000000;">?</span> <span style="background-color: #f5f5f5; color: #000000;">'</span><span style="background-color: #f5f5f5; color: #000000;">关闭</span><span style="background-color: #f5f5f5; color: #000000;">'</span><span style="background-color: #f5f5f5; color: #000000;"> : </span><span style="background-color: #f5f5f5; color: #000000;">'</span><span style="background-color: #f5f5f5; color: #000000;">开启</span><span style="background-color: #f5f5f5; color: #000000;">'</span><span style="background-color: #f5f5f5; color: #000000;">);
        });
    </span><span style="color: #0000ff;"></</span><span style="color: #800000;">script</span><span style="color: #0000ff;">></span>