javascript - Mobile Safari - iframe 固定内容

Question

Mobile Safari 将 iframe 强制为其内容大小。

因此，当 iframe 中有一个固定的 div 时，它不会修复。是否有 CSS 属性强制 iframe 在移动设备中滚动并尊重固定内容？

注意：固定内容在 iframe 内，而不是在容器内，因此 div 滚动无法解决此问题。

<iframe src="page-with-fixed-content" style="width: 100%; height: 100%;">
    <!-- Fixed layer on the page loaded to iframe -->
    <div style="position: fixed; top:0;">
        Not Fixed on iPhone (Fixed on desktop)
    </div>
</iframe>

CodePan 示例

标签： javascriptioscssiframemobile

Answer 1

几个月前，我在开发 web 应用程序时遇到了这个挑战，经过一番安静的研究后，下一篇文章中建议的“Shadow DOM”方法有所帮助。

https://medium.com/@dvoytenko/amp-ios-scrolling-redo-2-the-shadow-wrapper-approach-experimental-3362ed3c2fa2。

 var sd = document.body.attachShadow({mode: 'open'});

 // Main slot will absorb all undistributed children.
 var mainSlot = document.createElement('slot');
 var scroller = document.createElement('div');
 scroller.style = 'background: lightblue; position: absolute; top: 
  0; left: 0; right: 0; bottom: 0; overflow-x: hidden; overflow-y: auto; -webkit-overflow-scrolling: touch;';
  scroller.appendChild(mainSlot);
  sd.appendChild(scroller);

// Selectively, it's also possible to distribute fixed elements separately,
// emulating fixed layer transfer.
 var fixedLayer = document.createElement('div');
 fixedLayer.style = 'height: 0; width: 0; position: fixed; 
  overflow:visible;';
 sd.appendChild(fixedLayer);

 var mainFixedSlot = document.createElement('slot');
 mainFixedSlot.setAttribute('name', 'fixed');
 fixedLayer.appendChild(mainFixedSlot);

function addToFixedLayer(element) {
 //var slotId = String(Math.random());
 //var fixedSlot = document.createElement('slot');
 //fixedSlot.setAttribute('name', slotId);
 //fixedLayer.appendChild(fixedSlot);
 //element.setAttribute('slot', slotId);
 element.setAttribute('slot', 'fixed');
} 

 /*Call and pass fixed elemetns to addToFixedLayer method so that they stay 
 fixed while scrolling */

 addToFixedLayer(fixedDivId)

检查此演示https://jsfiddle.net/rsva63ep/