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css - iOS 上的动画 stroke-dashoffset

转载 作者:行者123 更新时间:2023-11-28 09:30:33 24 4
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因此,我通过增加 stroke-dashoffset 值来为这个 SVG Logo 设置动画

svg {
position: absolute; top: 50%; left: 50%;
transform: translateX(-50%) translateY(-50%);
width: 150px;
}

.cls-1,
.cls-2 {
fill:none;
stroke:#a9a9a9;
stroke-linecap:round;
stroke-linejoin:round;
stroke-width:10px;
}

.cls-1 {
stroke-dasharray: 496;
stroke-dashoffset: -496;
animation: firstLine 2s ease-out 0s infinite normal;
}

.cls-2 {
stroke-dasharray: 458;
stroke-dashoffset: -458;
animation: secondLine 2s ease-out 0s infinite normal;
}

@keyframes firstLine {
0% { stroke-dashoffset: -496; }
40% { stroke-dashoffset: 0; }
60% { stroke-dashoffset: 0; }
85% { stroke-dashoffset: 496; }
100% { stroke-dashoffset: 496; }
}

@keyframes secondLine {
0% { stroke-dashoffset: -458; }
45% { stroke-dashoffset: 0; }
60% { stroke-dashoffset: 0; }
90% { stroke-dashoffset: 458; }
100% { stroke-dashoffset: 458; }
}
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200.17 135"><path class="cls-1" d="M132.67,28.44a39.06,39.06,0,0,1,0,78.12H113.22V59.11A54.11,54.11,0,0,0,5,59.11v57.35a13.54,13.54,0,0,0,27.08,0v-9.9h27"/><path class="cls-2" d="M113.63,5h19a62.5,62.5,0,0,1,0,125H102.44a16.29,16.29,0,0,1-16.3-16.29V59.11a27,27,0,0,0-54.06,0V79.89h27"/></svg>

在桌面浏览器上打开时,一切正常。安卓也一样。但是在 iOS 上,动画就大错特错了。是否有一些我不知道的 iOS 特定错误 stroke-dashoffset

最佳答案

长期以来,我一直在寻找一种解决方案,即如何将负的 stroke-dashoffset 值替换为正值,以规避 safari 施加的限制。

给出了动画一行的解释。对于第二行,计算类似。

  • 线条的总长度为496 px;因此, 的值
    stroke-dashoffset = "496"
    完全隐藏线条。
  • 使用 double 值 stroke-dashoffset ="992" 画线
  • 使用三重值 stroke-dashoffset ="1488 ",线条被删除再次

CSS 解决方案

svg {
position: absolute; top: 50%; left: 50%;
transform: translateX(-50%) translateY(-50%);
width: 150px;
}

.cls-1,
.cls-2 {
fill:none;
stroke:#a9a9a9;
stroke-linecap:round;
stroke-linejoin:round;
stroke-width:10px;
}
.cls-1 {
stroke-dasharray: 496;
stroke-dashoffset: 0;
animation: firstLine 2s ease-out 0s infinite normal;
}

.cls-2 {
stroke-dasharray: 458;
stroke-dashoffset: 0;
animation: secondLine 2s ease-out 0s infinite normal;
}

@keyframes firstLine {
0% { stroke-dashoffset: 496; }
40% { stroke-dashoffset: 992; }
60% { stroke-dashoffset: 992; }
85% { stroke-dashoffset: 1488; }
100% { stroke-dashoffset: 1488; }
}

@keyframes secondLine {
0% { stroke-dashoffset: 458; }
45% { stroke-dashoffset: 916; }
60% { stroke-dashoffset: 916; }
90% { stroke-dashoffset: 1374; }
100% { stroke-dashoffset: 1374; }
}
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200.17 135">
<path class="cls-1 " d="M132.67,28.44a39.06,39.06,0,0,1,0,78.12H113.22V59.11A54.11,54.11,0,0,0,5,59.11v57.35a13.54,13.54,0,0,0,27.08,0v-9.9h27" >
</path>
<path class="cls-2" d="M113.63,5h19a62.5,62.5,0,0,1,0,125H102.44a16.29,16.29,0,0,1-16.3-16.29V59.11a27,27,0,0,0-54.06,0V79.89h27" >
</path>

</svg>

Logo 周围带有阴影的选项

添加阴影

<defs>
<filter id="shadow" x="-20%" y="-20%" width="200%" height="200%">
<feDropShadow dx="4" dy="8" stdDeviation="4"/>
</filter>
</defs>

body {
background: rgb(144,210,152);
background: linear-gradient(286deg, rgba(144,210,152,1) 29%, rgba(236,234,154,1) 69%);
}
svg {
position: absolute; top: 50%; left: 50%;
transform: translateX(-50%) translateY(-50%);
width: 150px;
}

.cls-1,
.cls-2 {
fill:none;
stroke:#a9a9a9;
stroke-linecap:round;
stroke-linejoin:round;
stroke-width:10px;
filter:url(#shadow);
}
.cls-1 {
stroke-dasharray: 496;
stroke-dashoffset: 0;
animation: firstLine 4s ease-out 0s infinite normal;
}

.cls-2 {
stroke-dasharray: 458;
stroke-dashoffset: 0;
animation: secondLine 4s ease-out 0s infinite normal;
}

@keyframes firstLine {
0% { stroke-dashoffset: 496; }
40% { stroke-dashoffset: 992; }
60% { stroke-dashoffset: 992; }
85% { stroke-dashoffset: 1488; }
100% { stroke-dashoffset: 1488; }
}

@keyframes secondLine {
0% { stroke-dashoffset: 458; }
45% { stroke-dashoffset: 916; }
60% { stroke-dashoffset: 916; }
90% { stroke-dashoffset: 1374; }
100% { stroke-dashoffset: 1374; }
}
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 220.17 150">
<defs>
<filter id="shadow" x="-20%" y="-20%" width="200%" height="200%">
<feDropShadow dx="4" dy="8" stdDeviation="4"/>
</filter>
</defs>

<path class="cls-1 " d="M132.67,28.44a39.06,39.06,0,0,1,0,78.12H113.22V59.11A54.11,54.11,0,0,0,5,59.11v57.35a13.54,13.54,0,0,0,27.08,0v-9.9h27" >
</path>
<path class="cls-2" d="M113.63,5h19a62.5,62.5,0,0,1,0,125H102.44a16.29,16.29,0,0,1-16.3-16.29V59.11a27,27,0,0,0-54.06,0V79.89h27" >
</path>

</svg>

SVG解决方案

svg {
position: absolute; top: 50%; left: 50%;
transform: translateX(-50%) translateY(-50%);
width: 150px;
}

.cls-1,
.cls-2 {
fill:none;
stroke:#a9a9a9;
stroke-linecap:round;
stroke-linejoin:round;
stroke-width:10px;
}
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200.17 135">
<path class="cls-1 " d="M132.67,28.44a39.06,39.06,0,0,1,0,78.12H113.22V59.11A54.11,54.11,0,0,0,5,59.11v57.35a13.54,13.54,0,0,0,27.08,0v-9.9h27" stroke-dasharray="496,496" stroke-dashoffset="496">
<animate id="an_offset"
attributeName="stroke-dashoffset"
begin="0s"
dur="3s"
values="496;992;992;1488"
fill="freeze"
repeatCount="indefinite" />
</path>
<path class="cls-2" d="M113.63,5h19a62.5,62.5,0,0,1,0,125H102.44a16.29,16.29,0,0,1-16.3-16.29V59.11a27,27,0,0,0-54.06,0V79.89h27" stroke-dasharray="458,458" stroke-dashoffset="458">
<animate id="an_offset2"
attributeName="stroke-dashoffset"
begin="0s"
dur="3s"
values="458;916;916;1374"
fill="freeze"
repeatCount="indefinite" />
</path>

</svg>

附加示例
从每条线的中点开始绘制

要实现动画,更改stroke-dasharray属性的参数

总行长为496px,一半是`248px

  • 因为参数的值按顺序表示:
    0 - 行248 - 空格 0 - 行248 - 空格
    因此,写stroke-dasharray = "0,248 0,248"会完全隐藏该行
  • 使用 stroke-dasharray = "0,0 496,0" 线条将完全可见。

svg {
position: absolute; top: 50%; left: 50%;
transform: translateX(-50%) translateY(-50%);
width: 150px;
}

.cls-1,
.cls-2 {
fill:none;
stroke:#a9a9a9;
stroke-linejoin:round;
stroke-width:10px;
}
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200.17 135">
<path class="cls-1 " d="M132.67,28.44a39.06,39.06,0,0,1,0,78.12H113.22V59.11A54.11,54.11,0,0,0,5,59.11v57.35a13.54,13.54,0,0,0,27.08,0v-9.9h27" stroke-dasharray="496,496" stroke-dashoffset="496">
<animate id="an_array"
attributeName="stroke-dasharray"
begin="0s"
dur="4s"
values="0,248 0,248;0,0 496,0;0,0 496,0;0,248 0,248"
fill="freeze"
repeatCount="indefinite" />
</path>
<path class="cls-2" d="M113.63,5h19a62.5,62.5,0,0,1,0,125H102.44a16.29,16.29,0,0,1-16.3-16.29V59.11a27,27,0,0,0-54.06,0V79.89h27" stroke-dasharray="458,458" stroke-dashoffset="458">
<animate id="an_array2"
attributeName="stroke-dasharray"
begin="0s"
dur="4s"
values="0,229 0,229;0,0 458,0;0,0 458,0;0,229 0,229"
fill="freeze"
repeatCount="indefinite" />
</path>

关于css - iOS 上的动画 stroke-dashoffset,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/57964904/

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