在网页开发中，SVG（Scalable Vector Graphics）动画以其矢量特性和轻量级而备受欢迎。然而，开发者有时会遇到SVG动画在某些设备上无法正常显示的问题，尤其是在iPhone等iOS设备上。本文将以一个实际案例出发，分析导致此问题的一个常见原因，并提供相应的解决方案。
一个开发者创建了一个SVG动画，该动画在大多数设备上都能正常显示，唯独在iPhone上无法显示。经过一番排查，发现问题出在<animate>标签的values属性上。
以下是导致问题的原始SVG代码片段：
<div class="contenuto-svg">
<svg viewBox="-85 -85 170 170" xmlns="http://www.w3.org/2000/svg">
<defs>
<filter id="blur">
<feGaussianBlur stdDeviation="4.8" />
</filter>
<linearGradient id="gradient" x1="0%" y1="0%" x2="100%" y2="100%">
<stop offset="10%" stop-color="#9DB6F2" />
<stop offset="70%" stop-color="#FF5321" />
<stop offset="20%" stop-color="#FF2E00" />
</linearGradient>
</defs>
<path fill="url(#gradient)" style="opacity: 1;" filter="url(#blur)">
<animate attributeName="d" dur="20000ms" repeatCount="indefinite"
values="M46.8,-53.3C55.6,-48.4,54.1,-28.9,52.8,-12.8C51.5,3.3,50.4,15.8,43.8,23.4C37.2,31,25.2,33.7,11.7,43.5C-1.7,53.2,-16.7,70.1,-28.8,69.8C-40.8,69.4,-49.9,51.7,-56.8,35.1C-63.7,18.4,-68.4,2.8,-67.8,-13.9C-67.2,-30.5,-61.2,-48.2,-49,-52.4C-36.8,-56.7,-18.4,-47.5,0.3,-47.9C19,-48.3,38,-58.1,46.8,-53.3Z;
M38.9,-46.9C53,-34.5,69,-24.7,67.4,-14.7C65.8,-4.7,46.7,5.6,36.9,20C27,34.3,26.5,52.7,19.6,56.2C12.8,59.7,-0.3,48.3,-11.3,40.3C-22.3,32.3,-31.1,27.7,-34.4,20.5C-37.7,13.4,-35.5,3.8,-38.3,-11.3C-41.1,-26.5,-48.9,-47,-43.4,-61C-37.8,-75,-18.9,-82.3,-3.3,-78.4C12.4,-74.5,24.7,-59.3,38.9,-46.9Z;
M25.6,-33.4C38.3,-19.9,57.2,-16.7,65.6,-6.1C74.1,4.6,72.1,22.5,62.9,34.2C53.6,45.8,37.1,51.1,19.7,59.9C2.4,68.7,-15.7,80.9,-24.3,74.4C-32.9,68,-32,43,-36.8,25.6C-41.7,8.2,-52.5,-1.5,-50.6,-8.3C-48.7,-15.2,-34.1,-19.3,-23.6,-33.2C-13.1,-47,-6.5,-70.7,0,-70.7C6.5,-70.7,13,-46.9,25.6,-33.4Z;
M36.1,-40.2C51.4,-30.3,71.5,-23.2,71.4,-14C71.3,-4.8,51.1,6.5,37.5,13.8C23.9,21.1,17,24.4,6.9,35C-3.2,45.7,-16.5,63.7,-23.2,62C-30,60.3,-30.2,38.9,-33.3,23.9C-36.4,8.9,-42.4,0.2,-46.9,-14.2C-51.4,-28.5,-54.5,-48.6,-46.4,-59.7C-38.4,-70.9,-19.2,-73.2,-4.4,-68C10.4,-62.8,20.9,-50.1,36.1,-40.2Z;
M35.5,-41.2C48.2,-31.7,62.1,-22.5,70.7,-7.5C79.3,7.6,82.5,28.5,73.4,40.6C64.3,52.6,42.9,55.7,26.4,53.4C10,51,-1.4,43.2,-11.9,37.3C-22.3,31.5,-31.7,27.6,-36.2,20.6C-40.7,13.5,-40.2,3.2,-38.7,-7.1C-37.3,-17.5,-34.7,-27.9,-28.1,-38.5C-21.5,-49,-10.7,-59.7,0.3,-60.1C11.4,-60.5,22.8,-50.7,35.5,-41.2Z;
M34.2,-37.4C48.6,-28.8,67.2,-22,69.5,-11.9C71.8,-1.7,57.7,11.7,46.2,22.1C34.8,32.5,26,40,15.8,44C5.5,47.9,-6.2,48.5,-17.9,45.7C-29.6,42.9,-41.3,36.7,-54.5,25.7C-67.8,14.7,-82.6,-1.3,-79.2,-12.8C-75.8,-24.4,-54.2,-31.6,-37.9,-39.8C-21.7,-48.1,-10.8,-57.4,-0.4,-56.9C10,-56.3,19.9,-46,34.2,-37.4Z;
M46.8,-53.3C55.6,-48.4,54.1,-28.9,52.8,-12.8C51.5,3.3,50.4,15.8,43.8,23.4C37.2,31,25.2,33.7,11.7,43.5C-1.7,53.2,-16.7,70.1,-28.8,69.8C-40.8,69.4,-49.9,51.7,-56.8,35.1C-63.7,18.4,-68.4,2.8,-67.8,-13.9C-67.2,-30.5,-61.2,-48.2,-49,-52.4C-36.8,-56.7,-18.4,-47.5,0.3,-47.9C19,-48.3,38,-58.1,46.8,-53.3Z;
">
</animate>
</path>
</svg>
</div>仔细观察<animate>标签的values属性，可以发现问题在于属性值的末尾多了一个分号 ;。尽管在某些浏览器或设备上可能不会产生影响，但在iPhone等iOS设备上，这个多余的分号会导致动画无法正常解析和显示。
解决办法非常简单：移除values属性值末尾的分号即可。
以下是修复后的SVG代码片段：
<div class="contenuto-svg">
<svg viewBox="-85 -85 170 170" xmlns="http://www.w3.org/2000/svg">
<defs>
<filter id="blur">
<feGaussianBlur stdDeviation="4.8" />
</filter>
<linearGradient id="gradient" x1="0%" y1="0%" x2="100%" y2="100%">
<stop offset="10%" stop-color="#9DB6F2" />
<stop offset="70%" stop-color="#FF5321" />
<stop offset="20%" stop-color="#FF2E00" />
</linearGradient>
</defs>
<path fill="url(#gradient)" style="opacity: 1;" filter="url(#blur)">
<animate attributeName="d" dur="20000ms" repeatCount="indefinite"
values="M46.8,-53.3C55.6,-48.4,54.1,-28.9,52.8,-12.8C51.5,3.3,50.4,15.8,43.8,23.4C37.2,31,25.2,33.7,11.7,43.5C-1.7,53.2,-16.7,70.1,-28.8,69.8C-40.8,69.4,-49.9,51.7,-56.8,35.1C-63.7,18.4,-68.4,2.8,-67.8,-13.9C-67.2,-30.5,-61.2,-48.2,-49,-52.4C-36.8,-56.7,-18.4,-47.5,0.3,-47.9C19,-48.3,38,-58.1,46.8,-53.3Z;
M38.9,-46.9C53,-34.5,69,-24.7,67.4,-14.7C65.8,-4.7,46.7,5.6,36.9,20C27,34.3,26.5,52.7,19.6,56.2C12.8,59.7,-0.3,48.3,-11.3,40.3C-22.3,32.3,-31.1,27.7,-34.4,20.5C-37.7,13.4,-35.5,3.8,-38.3,-11.3C-41.1,-26.5,-48.9,-47,-43.4,-61C-37.8,-75,-18.9,-82.3,-3.3,-78.4C12.4,-74.5,24.7,-59.3,38.9,-46.9Z;
M25.6,-33.4C38.3,-19.9,57.2,-16.7,65.6,-6.1C74.1,4.6,72.1,22.5,62.9,34.2C53.6,45.8,37.1,51.1,19.7,59.9C2.4,68.7,-15.7,80.9,-24.3,74.4C-32.9,68,-32,43,-36.8,25.6C-41.7,8.2,-52.5,-1.5,-50.6,-8.3C-48.7,-15.2,-34.1,-19.3,-23.6,-33.2C-13.1,-47,-6.5,-70.7,0,-70.7C6.5,-70.7,13,-46.9,25.6,-33.4Z;
M36.1,-40.2C51.4,-30.3,71.5,-23.2,71.4,-14C71.3,-4.8,51.1,6.5,37.5,13.8C23.9,21.1,17,24.4,6.9,35C-3.2,45.7,-16.5,63.7,-23.2,62C-30,60.3,-30.2,38.9,-33.3,23.9C-36.4,8.9,-42.4,0.2,-46.9,-14.2C-51.4,-28.5,-54.5,-48.6,-46.4,-59.7C-38.4,-70.9,-19.2,-73.2,-4.4,-68C10.4,-62.8,20.9,-50.1,36.1,-40.2Z;
M35.5,-41.2C48.2,-31.7,62.1,-22.5,70.7,-7.5C79.3,7.6,82.5,28.5,73.4,40.6C64.3,52.6,42.9,55.7,26.4,53.4C10,51,-1.4,43.2,-11.9,37.3C-22.3,31.5,-31.7,27.6,-36.2,20.6C-40.7,13.5,-40.2,3.2,-38.7,-7.1C-37.3,-17.5,-34.7,-27.9,-28.1,-38.5C-21.5,-49,-10.7,-59.7,0.3,-60.1C11.4,-60.5,22.8,-50.7,35.5,-41.2Z;
M34.2,-37.4C48.6,-28.8,67.2,-22,69.5,-11.9C71.8,-1.7,57.7,11.7,46.2,22.1C34.8,32.5,26,40,15.8,44C5.5,47.9,-6.2,48.5,-17.9,45.7C-29.6,42.9,-41.3,36.7,-54.5,25.7C-67.8,14.7,-82.6,-1.3,-79.2,-12.8C-75.8,-24.4,-54.2,-31.6,-37.9,-39.8C-21.7,-48.1,-10.8,-57.4,-0.4,-56.9C10,-56.3,19.9,-46,34.2,-37.4Z;
M46.8,-53.3C55.6,-48.4,54.1,-28.9,52.8,-12.8C51.5,3.3,50.4,15.8,43.8,23.4C37.2,31,25.2,33.7,11.7,43.5C-1.7,53.2,-16.7,70.1,-28.8,69.8C-40.8,69.4,-49.9,51.7,-56.8,35.1C-63.7,18.4,-68.4,2.8,-67.8,-13.9C-67.2,-30.5,-61.2,-48.2,-49,-52.4C-36.8,-56.7,-18.4,-47.5,0.3,-47.9C19,-48.3,38,-58.1,46.8,-53.3Z">
</animate>
</path>
</svg>
</div>通过以上步骤，可以有效地解决SVG动画在iPhone等iOS设备上无法显示的问题，提升用户体验。记住，细节决定成败，细致的检查和调试是保证代码质量的关键。
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