मुझे मूल iOS ज़ूम को अक्षम करके, और बजाय जावास्क्रिप्ट में ज़ूम कार्यक्षमता को लागू करने के, जो मैंने देखा है, उससे अलग एक नया वर्कअराउंड मिला है।
ज़ूम / ओरिएंटेशन समस्या के विभिन्न अन्य समाधानों पर एक उत्कृष्ट पृष्ठभूमि Sérgio Lopes द्वारा है: चित्र के लिए अभिविन्यास परिवर्तन पर प्रसिद्ध iOS ज़ूम बग पर एक फिक्स ।
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" id="viewport" content="user-scalable=no,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0" />
<title>Robocat mobile Safari zoom fix</title>
<style>
body {
padding: 0;
margin: 0;
}
#container {
-webkit-transform-origin: 0px 0px;
-webkit-transform: scale3d(1,1,1);
/* shrink-to-fit needed so can measure width of container http://stackoverflow.com/questions/450903/make-css-div-width-equal-to-contents */
display: inline-block;
*display: inline;
*zoom: 1;
}
#zoomfix {
opacity: 0;
position: absolute;
z-index: -1;
top: 0;
left: 0;
}
</style>
</head>
<body>
<input id="zoomfix" disabled="1" tabIndex="-1">
<div id="container">
<style>
table {
counter-reset: row cell;
background-image: url(http://upload.wikimedia.org/wikipedia/commons/3/38/JPEG_example_JPG_RIP_010.jpg);
}
tr {
counter-increment: row;
}
td:before {
counter-increment: cell;
color: white;
font-weight: bold;
content: "row" counter(row) ".cell" counter(cell);
}
</style>
<table cellspacing="10">
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</table>
</div>
<script>
(function() {
var viewportScale = 1;
var container = document.getElementById('container');
var scale, originX, originY, relativeOriginX, relativeOriginY, windowW, windowH, containerW, containerH, resizeTimer, activeElement;
document.addEventListener('gesturestart', function(event) {
scale = null;
originX = event.pageX;
originY = event.pageY;
relativeOriginX = (originX - window.pageXOffset) / window.innerWidth;
relativeOriginY = (originY - window.pageYOffset) / window.innerHeight;
windowW = window.innerWidth;
windowH = window.innerHeight;
containerW = container.offsetWidth;
containerH = container.offsetHeight;
});
document.addEventListener('gesturechange', function(event) {
event.preventDefault();
if (originX && originY && event.scale && event.pageX && event.pageY) {
scale = event.scale;
var newWindowW = windowW / scale;
if (newWindowW > containerW) {
scale = windowW / containerW;
}
var newWindowH = windowH / scale;
if (newWindowH > containerH) {
scale = windowH / containerH;
}
if (viewportScale * scale < 0.1) {
scale = 0.1/viewportScale;
}
if (viewportScale * scale > 10) {
scale = 10/viewportScale;
}
container.style.WebkitTransformOrigin = originX + 'px ' + originY + 'px';
container.style.WebkitTransform = 'scale3d(' + scale + ',' + scale + ',1)';
}
});
document.addEventListener('gestureend', function() {
if (scale && (scale < 0.95 || scale > 1.05)) {
viewportScale *= scale;
scale = null;
container.style.WebkitTransform = '';
container.style.WebkitTransformOrigin = '';
document.getElementById('viewport').setAttribute('content', 'user-scalable=no,initial-scale=' + viewportScale + ',minimum-scale=' + viewportScale + ',maximum-scale=' + viewportScale);
document.body.style.WebkitTransform = 'scale3d(1,1,1)';
// Without zoomfix focus, after changing orientation and zoom a few times, the iOS viewport scale functionality sometimes locks up (and completely stops working).
// The reason I thought this hack would work is because showing the keyboard is the only way to affect the viewport sizing, which forces the viewport to resize (even though the keyboard doesn't actually get time to open!).
// Also discovered another amazing side effect: if you have no meta viewport element, and focus()/blur() in gestureend, zoom is disabled!! Wow!
var zoomfix = document.getElementById('zoomfix');
zoomfix.disabled = false;
zoomfix.focus();
zoomfix.blur();
setTimeout(function() {
zoomfix.disabled = true;
window.scrollTo(originX - relativeOriginX * window.innerWidth, originY - relativeOriginY * window.innerHeight);
// This forces a repaint. repaint *intermittently* fails to redraw correctly, and this fixes the problem.
document.body.style.WebkitTransform = '';
}, 0);
}
});
})();
</script>
</body>
</html>
इसमें सुधार किया जा सकता था, लेकिन मेरी जरूरतों के लिए यह उन प्रमुख कमियों से बचता है जो मेरे द्वारा देखे गए अन्य सभी समाधानों के साथ होती हैं। अब तक मैंने केवल iOS4 के साथ iPad 2 पर मोबाइल सफारी का उपयोग करके इसका परीक्षण किया है।
फोकस () / धुंधला () ज़ूम कार्यक्षमता के सामयिक लॉकअप को रोकने के लिए एक समाधान है जो अभिविन्यास बदलने और कुछ समय ज़ूम करने के बाद हो सकता है।
Document.body.style सेट करना एक पूर्ण स्क्रीन रिप्रेसेंट को बाध्य करता है, जो एक सामयिक रुक-रुक कर आने वाली समस्याओं से बचा जाता है, जहां ज़ूम के बाद रिपेंट बुरी तरह से विफल हो जाता है।