在Safari iOS 10中，SVG变换旋转90度，180度或270度不在圆上工作

时间：2016-11-01 16:05:55

标签： ios svg mobile-safari ios10

我想通过设置stroke-dasharray和变化stroke-dashoffset来创建使用SVG圈元素的圆环图。 SVG元素需要旋转270（或-90）度，以便图表“bar”从顶部开始。这是代码：

http://jsfiddle.net/q3wb6gkq/

使用transform="rotate(270, 80, 80)"中的第一个数字指定旋转角度。

问题是：在iOS 10上的Safari中查看时，不会应用此轮播。实际上，设置90度，180度或270度旋转没有效果。同样的角度但是负面的（例如-90）也没有应用。

以下是iOS 10.0.1上Safari中的上述小提琴的屏幕截图：

iOS 10 screenshot

这是iOS 9.3.5上的Safari中的小提琴：

iOS 9 screenshot

作为一种解决方法，我发现使用像270.1度这样的东西解决了这个问题，但是我想知道为什么270不起作用以及是否有更好的处理方式。

3 个答案:

答案 0 :(得分：2)

我在iOS 10.1和Safari 10.0.1上经历过这种痛苦。该错误肯定是由任何rotate值触发的，该值计算可被90度整除的值。

但它更奇怪了。

请参阅我放在一起的这个演示/系列最小测试用例（jsFiddle版本here）。最好运行该代码段，然后展开到整页：

svg {
  height: 80px;
  width: 80px;
}

circle {
  fill: none;
  stroke-dasharray: 150;
  stroke-width: 4px;
  stroke: #6fdb6f;
  transform-origin: center center;
}

.degrot {
  transform: rotate(-90deg);
}

.degrot-offset {
  transform: rotate(-90.1deg);
}

.degrot-offset-more {
  transform: rotate(-92deg);
}

.turnrot {
  transform: rotate(-0.25turn);
}

.turnrot-offset {
  transform: rotate(-0.251turn);
}


svg[viewBox] circle {
  stroke-dasharray: 300;
  stroke-width: 8px;
}

svg[viewBox].scaledown circle {
  stroke-dasharray: 300;
  stroke-width: 8px;
}

svg[viewBox].noscale circle {
  stroke-dasharray: 150;
  stroke-width: 4px;
}

svg[viewBox].scaleup circle {
  stroke-dasharray: 75;
  stroke-width: 2px;
}

.wc {
  will-change: transform;
}


/* Demo prettification */

p:last-child {
  margin-bottom: 0;
}

td {
  padding: 10px;
}

tr td:first-of-type {
  width: 80px;
  min-height: 80px;
}

tr + tr td {
  border-top: 1px solid #dcdcdc;
}
<table>
  <tr><td colspan="2">In Safari 10.0.1 and iOS 10.1, strange behavior can be observed on SVG shapes with <code>rotate</code> values not divisible by 90 degrees, when <code>transform-origin: center center;</code></td></tr>
  <tr>
    <td>

      <svg xmlns="http://www.w3.org/2000/svg">
        <circle class="degrot" r="35" cy="40" cx="40" />
      </svg>

    </td>
    <td>
      <code>transform: rotate(-90deg);</code>
      <p>The stroke improperly begins <a href="https://www.w3.org/TR/SVG11/shapes.html#CircleElement">at 3:00</a>, as if the <code>transform</code> rule hadn't been applied.</p>
    </td>
  </tr>

  <tr>
    <td>

      <svg xmlns="http://www.w3.org/2000/svg">
        <circle class="degrot-offset" r="35" cy="40" cx="40" />
      </svg>

    </td>
    <td>
      <code>transform: rotate(-90.1deg);</code>
      <p>The stroke begins at (twelve seconds before) 12:00, as expected.</p>
    </td>
  </tr>

  <tr>
    <td>

      <svg xmlns="http://www.w3.org/2000/svg">
        <circle class="turnrot" r="35" cy="40" cx="40" />
      </svg>

    </td>
    <td>
      <code>transform: rotate(-0.25turn);</code>
      <p>The same bug applies to any <code>rotate</code> value which computes to a multiple of 90 degrees.</p>
    </td>
  </tr>

  <tr>
    <td>

      <svg xmlns="http://www.w3.org/2000/svg">
        <circle class="turnrot-offset" r="35" cy="40" cx="40" />
      </svg>

    </td>
    <td>
      <code>transform: rotate(-0.251turn);</code>
      <p>43 seconds before noon.</p>
    </td>
  </tr>


  <tr><td colspan="2">But when the SVG element specifies a <code>viewBox</code> which is being scaled down, things can get weird:</td></tr>
  
  <tr>
    <td>

      <svg viewBox="0 0 160 160" xmlns="http://www.w3.org/2000/svg">
        <circle class="degrot" r="70" cy="80" cx="80" />
      </svg>

    </td>
    <td>
      <code>transform: rotate(-90deg);</code>
      <p>So far, so the same.</p>
    </td>
  </tr>

  <tr>
    <td>

      <svg viewBox="0 0 160 160" xmlns="http://www.w3.org/2000/svg">
        <circle class="degrot-offset" r="70" cy="80" cx="80" />
      </svg>

    </td>
    <td>
      <code>transform: rotate(-90.1deg);</code>
      <p>But now, offsetting by a little bit doesn't work, <em>unless</em> you zoom in the page in past a certain zoom threshold (either via pinching, or <code>View > Zoom</code> and/or keyboard shortcut). Try it; it's unsetting!</p>
      <p>This is probably because of some rounding of that the zooming engine performs, because...</p>
    </td>
  </tr>

  <tr>
    <td>

      <svg viewBox="0 0 160 160" class="scaledown" xmlns="http://www.w3.org/2000/svg">
        <circle class="degrot-offset-more" r="70" cy="80" cx="80" />
      </svg>

    </td>
    <td>
      <code>transform: rotate(-92deg);</code>
      <p>offsetting by a larger amount restores expected behavior.</p>
    </td>
  </tr>

  <tr><td colspan="2">If the SVG element is not being scaled <em>down</em>, behavior identical to the first section resumes. Zooming has no effect:</td></tr>
  
  <tr>
    <td>
      
      <svg viewBox="0 0 80 80" class="noscale" xmlns="http://www.w3.org/2000/svg">
        <circle class="degrot" r="35" cy="40" cx="40" />
      </svg>

      <svg viewBox="0 0 40 40" class="scaleup" xmlns="http://www.w3.org/2000/svg">
        <circle class="degrot" r="17.5" cy="20" cx="20" />
      </svg>

    </td>
    <td>
      <code>transform: rotate(-90deg);</code>
      <p>
      Top: No scaling (viewBox dimensions match parent element's)<br><br>
      Bottom: Scaling up (viewBox dimensions half of parent element's)
      </p>
    </td>
  </tr>

  <tr>
    <td>
      
      <svg viewBox="0 0 80 80" class="noscale" xmlns="http://www.w3.org/2000/svg">
        <circle class="degrot-offset" r="35" cy="40" cx="40" />
      </svg>

      <svg viewBox="0 0 40 40" class="scaleup" xmlns="http://www.w3.org/2000/svg">
        <circle class="degrot-offset" r="17.5" cy="20" cx="20" />
      </svg>

    </td>
    <td>
      <code>transform: rotate(-90.1deg);</code>
      <p>
        Top: No scaling (viewBox dimensions match parent element's)<br><br>
        Bottom: Scaling up (viewBox dimensions half of parent element's)
      </p>
    </td>
  </tr>

  <tr><td colspan="2">But there is one exception:</td></tr>

  <tr>
    <td>
      
      <svg class="degrot wc" xmlns="http://www.w3.org/2000/svg">
        <circle r="35" cy="40" cx="40" />
      </svg>

    </td>
    <td>
      <p>On the parent <code>svg</code> element:</p>
      <code>transform: rotate(-90deg);<br>will-change: transform;</code>
      <p>Iff the the the rotation is applied to a <em>parent</em> of the SVG shape (including the SVG element itself) along with the rule <code>will-change: transform</code>, all rotation values work as expected.</p>
    </td>
  </tr>

  <tr><td colspan="2">All these behaviors have been observed in Safari 10.0.1 and iOS 10.1. They appear to be fixed as of iOS 10.2 Beta 2.</td></tr>
</table>

如演示中所述，它似乎已在iOS 10.2中修复，至少在我刚下载的公开测试版中。据推测，Safari修复程序也将在适当的时候到达。

iOS 10.1

iOS 10.1: bug present

iOS 10.2（公共测试版2）

iOS 10.2: bug not present

答案 1 :(得分：1)

确实，将旋转变换设置为90.1deg就可以解决问题...

我测试了很多东西，在这里报道：https://codepen.io/KevinNTH/pen/ZBgKdG 

<!-- workaround ios -->
<svg class="wka-ios">
  <g transform="rotate(-90.1 30 30)">
    <circle cx="25" cy="25" r="15"/>
  </g>
</svg>

答案 2 :(得分：0)

这也发生在我身上，我决定使用一个可以被90度整除的旋转，以便在此期间解决这个问题。

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