那些遇到过的问题

iOS 上的动画笔划-dashoffset

Axi*_*iol 5 css animation svg

所以，我通过增加stroke-dashoffset值来动画化这个 SVG 徽标

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; }
}
Run Code Online (Sandbox Code Playgroud) 
<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>
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当在桌面浏览器上打开时，一切正常。安卓也一样。但在 iOS 上，动画却出现了很大的问题。是否有一些stroke-dashoffset我不知道的 iOS 特定错误？

Ale*_*_TT 5

我很长时间以来一直在寻找一种解决方案，如何用正值替换负的 stroke-dashoffset 值，以规避 safari 施加的限制。

\n\n

给出了对一根线进行动画处理的说明。对于第二行，计算类似。

\n\n
    \n
  • 线路总长度为496 px；因此，值\nstroke-dashoffset = "496"完全隐藏了该线。
    • \n
  • 具有双重价值stroke-dashoffset ="992"线绘制
    • \n
  • 具有三重价值stroke-dashoffset =" 1488 "，该行将再次被删除\n
    • \n
\n\n

CSS解决方案

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\r\n
\r\n
svg {\r\n  position: absolute; top: 50%; left: 50%;\r\n  transform: translateX(-50%) translateY(-50%);\r\n  width: 150px;\r\n}\r\n\r\n.cls-1,\r\n.cls-2 {\r\n  fill:none;\r\n  stroke:#a9a9a9;\r\n  stroke-linecap:round;\r\n  stroke-linejoin:round;\r\n  stroke-width:10px;\r\n}\r\n.cls-1 {\r\n  stroke-dasharray: 496;\r\n  stroke-dashoffset: 0;\r\n  animation: firstLine 2s ease-out 0s infinite normal;\r\n}\r\n\r\n.cls-2 {\r\n  stroke-dasharray: 458;\r\n  stroke-dashoffset: 0;\r\n  animation: secondLine 2s ease-out 0s infinite normal;\r\n}\r\n\r\n@keyframes firstLine {\r\n  0% { stroke-dashoffset: 496; }\r\n  40% { stroke-dashoffset: 992; }\r\n  60% { stroke-dashoffset: 992; }\r\n  85% { stroke-dashoffset: 1488; }\r\n  100% { stroke-dashoffset: 1488; }\r\n}\r\n\r\n@keyframes secondLine {\r\n  0% { stroke-dashoffset: 458; }\r\n  45% { stroke-dashoffset: 916; }\r\n  60% { stroke-dashoffset: 916; }\r\n  90% { stroke-dashoffset: 1374; }\r\n  100% { stroke-dashoffset: 1374; }\r\n}
Run Code Online (Sandbox Code Playgroud)\r\n
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200.17 135">\r\n<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" >\r\n</path>\r\n  <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" > \r\n</path>\r\n \r\n</svg>
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\r\n
\r\n

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徽标周围带有阴影的选项

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添加阴影

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<defs>\n        <filter id="shadow" x="-20%" y="-20%" width="200%" height="200%">\n            <feDropShadow dx="4" dy="8" stdDeviation="4"/>\n        </filter>\n    </defs> \n
Run Code Online (Sandbox Code Playgroud)\n\n

\r\n
\r\n
<defs>\n        <filter id="shadow" x="-20%" y="-20%" width="200%" height="200%">\n            <feDropShadow dx="4" dy="8" stdDeviation="4"/>\n        </filter>\n    </defs> \n
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body {\r\nbackground: rgb(144,210,152);\r\nbackground: linear-gradient(286deg, rgba(144,210,152,1) 29%, rgba(236,234,154,1) 69%);\r\n}\r\nsvg {\r\n  position: absolute; top: 50%; left: 50%;\r\n  transform: translateX(-50%) translateY(-50%);\r\n  width: 150px;\r\n}\r\n\r\n.cls-1,\r\n.cls-2 {\r\n  fill:none;\r\n  stroke:#a9a9a9;\r\n  stroke-linecap:round;\r\n  stroke-linejoin:round;\r\n  stroke-width:10px;\r\n  filter:url(#shadow);\r\n}\r\n.cls-1 {\r\n  stroke-dasharray: 496;\r\n  stroke-dashoffset: 0;\r\n  animation: firstLine 4s ease-out 0s infinite normal;\r\n}\r\n\r\n.cls-2 {\r\n  stroke-dasharray: 458;\r\n  stroke-dashoffset: 0;\r\n  animation: secondLine 4s ease-out 0s infinite normal;\r\n}\r\n\r\n@keyframes firstLine {\r\n  0% { stroke-dashoffset: 496; }\r\n  40% { stroke-dashoffset: 992; }\r\n  60% { stroke-dashoffset: 992; }\r\n  85% { stroke-dashoffset: 1488; }\r\n  100% { stroke-dashoffset: 1488; }\r\n}\r\n\r\n@keyframes secondLine {\r\n  0% { stroke-dashoffset: 458; }\r\n  45% { stroke-dashoffset: 916; }\r\n  60% { stroke-dashoffset: 916; }\r\n  90% { stroke-dashoffset: 1374; }\r\n  100% { stroke-dashoffset: 1374; }\r\n}
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\r\n

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SVG解决方案

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\r\n
\r\n
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 220.17 150">\r\n<defs>\r\n        <filter id="shadow" x="-20%" y="-20%" width="200%" height="200%">\r\n            <feDropShadow dx="4" dy="8" stdDeviation="4"/>\r\n        </filter>\r\n    </defs> \r\n \t\r\n<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" >\r\n</path>\r\n  <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" > \r\n</path> \r\n\r\n</svg>
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svg {\r\n  position: absolute; top: 50%; left: 50%;\r\n  transform: translateX(-50%) translateY(-50%);\r\n  width: 150px;\r\n}\r\n\r\n.cls-1,\r\n.cls-2 {\r\n  fill:none;\r\n  stroke:#a9a9a9;\r\n  stroke-linecap:round;\r\n  stroke-linejoin:round;\r\n  stroke-width:10px;\r\n}
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\r\n
\r\n

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附加示例
\n\xc2\xa0 从每条线的中点开始绘制

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要实现动画，请更改以下参数stroke-dasharray属性的参数

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线路总长度为496px，其中一半为 248px

\n\n
    \n
  • 因为参数的值按顺序表示：
    \n 0 - line, 248 - space 0 - line, 248 - space。
    \n因此，写stroke-dasharray = "0,248 0,248"会完全隐藏该行
    • \n
  • 和stroke-dasharray = "0,0 496,0"线将完全可见。
    • \n
\n\n

\r\n
\r\n
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200.17 135">\r\n<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">\r\n  <animate id="an_offset"\r\n    attributeName="stroke-dashoffset"\r\n\tbegin="0s"\r\n\tdur="3s"\r\n\tvalues="496;992;992;1488"\r\n\tfill="freeze"\r\n\trepeatCount="indefinite"  />\r\n</path>\r\n  <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"> \r\n    <animate id="an_offset2"\r\n\t attributeName="stroke-dashoffset"\r\n\t begin="0s"\r\n\t dur="3s"\r\n\t values="458;916;916;1374"\r\n\t fill="freeze"\r\n\t repeatCount="indefinite" />\r\n</path>\r\n \r\n</svg>
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svg {\r\n  position: absolute; top: 50%; left: 50%;\r\n  transform: translateX(-50%) translateY(-50%);\r\n  width: 150px;\r\n}\r\n\r\n.cls-1,\r\n.cls-2 {\r\n  fill:none;\r\n  stroke:#a9a9a9;\r\n  stroke-linejoin:round;\r\n  stroke-width:10px;\r\n}
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