CSS3实现圆环进度条

摘要:圆环进度条被应用于各个场景,比如我们可以用来表示加载进度等。通常我们可以用 css3 的动画去实现。

详解 css3 实现圆环进度条

简单的画一个圆环,我们都知道如何使用 css 画一个圆环。(利用border属性、border-radius属性)

HTML 代码:

<div class="circle></div>

 CSS 代码:

.circle{
  width:160px;
  height:160px;
  border:20px solid red;
  border-radius:50%;            
}

CSS3实现圆环进度条

 实现圆环进度条属性,我们利用 css 画扇形,然后结合 css3 的动画属性去实现。结合代码去讲解:

HTML代码:

<div class="circle-progress">
        <div class="content left">
            <div class="circle left-circle"></div>
        </div>
        <div class="content right">
            <div class="circle right-circle"></div>
        </div>
    </div>

 

 首先确定圆环进度条最外层 css 的属性:

 .circle-progress {
            position: relative;
            width: 200px;
            height: 200px;
            border: 1px solid #888;  /*可选属性,仅供测试使用*/
        }

然后定位 content 以及 left 和 right 的属性值:

.content {
            position: absolute;
            top: 0;
            width: 100px;
            height: 200px;
            margin: 0;
            padding: 0;
            overflow: hidden;
        }
        
        .left {
            left: 0;
        }
        
        .right {
            right: 0;
        }

 

最后确定 left-circle 和 right-circle 属性:

 .circle {
            position: absolute;
            margin: 0;
            width: 160px;
            height: 160px;
            border-radius: 50%;
            border: 20px solid transparent;
            transform: rotate(135deg);
        }
        
        .left-circle {
            left: 0;
            border-top-color: green;
            border-left-color: green;
            animation: circle-left 5s linear infinite;
        }
        
        .right-circle {
            right: 0;
            border-bottom-color: green;
            border-right-color: green;
            animation: circle-right 5s linear infinite;
        }

 

动画 css3 代码:

  @keyframes circle-right {
            0% {
                transform: rotate(135deg);
            }
            50%,
            100% {
                transform: rotate(315deg);
            }
        }
        
        @keyframes circle-left {
            0%,
            50% {
                transform: rotate(135deg);
            }
            100% {
                transform: rotate(315deg);
            }
        }

 

 

完整的代码:

<!DOCTYPE html>
<html>

<head>
    <title>圆环进度条</title>
    <meta charset="utf-8" name="viewport" content="width=device-width;initial-scale=1.0" />
    <style type="text/css">
        html,
        body {
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        
        .circle-progress {
            position: relative;
            width: 200px;
            height: 200px;
            border: 1px solid #888;
        }
        
        .content {
            position: absolute;
            top: 0;
            width: 100px;
            height: 200px;
            margin: 0;
            padding: 0;
            overflow: hidden;
        }
        
        .left {
            left: 0;
        }
        
        .right {
            right: 0;
        }
        
        .circle {
            position: absolute;
            margin: 0;
            width: 160px;
            height: 160px;
            border-radius: 50%;
            border: 20px solid transparent;
            transform: rotate(135deg);
        }
        
        .left-circle {
            left: 0;
            border-top-color: green;
            border-left-color: green;
            animation: circle-left 5s linear infinite;
        }
        
        .right-circle {
            right: 0;
            border-bottom-color: green;
            border-right-color: green;
            animation: circle-right 5s linear infinite;
        }
        
        @keyframes circle-right {
            0% {
                transform: rotate(135deg);
            }
            50%,
            100% {
                transform: rotate(315deg);
            }
        }
        
        @keyframes circle-left {
            0%,
            50% {
                transform: rotate(135deg);
            }
            100% {
                transform: rotate(315deg);
            }
        }
    </style>
</head>

<body>
    <div class="circle-progress">
        <div class="content left">
            <div class="circle left-circle"></div>
        </div>
        <div class="content right">
            <div class="circle right-circle"></div>
        </div>
    </div>
</body>

</html>

 

CSS3实现圆环进度条

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