Question

我添加了"viewport"元标记"width=device-width,initial-scale=1.0"，在iPad上，页面在横向模式下正常加载，它可以很好地切换到纵向，当我将其旋转回景观时，它会缩放页面向上，我必须捏缩放回1级。

我可以通过添加"maximum-scale=1.0, user-scalable=no"来解决此问题，但我想知道是否有一种方法可以解决这个问题而不会让用户放弃缩放页面。

如果您有任何建议，我很乐意听到他们，
谢谢！

Answer 1

------更新------

这不再是iOS7中的问题。 Scott Jehl在适用于iOS6的github scottjehl/iOS-Orientationchange-Fix上有更好的解决方法。

------原始答案------

Jeremy Keith（@adactio）在他的博客上有一个很好的解决方案Orientation and scale

保持标记的可扩展性

<meta name="viewport" content="width=device-width, initial-scale=1">

然后使用javascript禁用可伸缩性，直到使用此脚本 gesturestart ：

if (navigator.userAgent.match(/iPhone/i) || navigator.userAgent.match(/iPad/i)) {
    var viewportmeta = document.querySelector('meta[name="viewport"]');
    if (viewportmeta) {
        viewportmeta.content = 'width=device-width, minimum-scale=1.0, maximum-scale=1.0, initial-scale=1.0';
        document.body.addEventListener('gesturestart', function () {
            viewportmeta.content = 'width=device-width, minimum-scale=0.25, maximum-scale=1.6';
        }, false);
    }
}

Answer 2

Scott Jehl提出了一个出色的解决方案，它使用加速度计来预测方向变化。此解决方案响应迅速，不会干扰缩放手势。

https://github.com/scottjehl/iOS-Orientationchange-Fix

工作原理：此修复程序通过侦听设备来实现加速度计用于预测何时将发生方向变化。当它认为方向即将发生变化时，脚本会禁用用户缩放，允许方向更改正确发生，使用缩放禁用。一旦设备出现，脚本将再次恢复缩放要么接近直立，要么取向改变。这样，在页面进入时，永远不会禁用用户缩放使用

缩小来源：

/*! A fix for the iOS orientationchange zoom bug. Script by @scottjehl, rebound by @wilto.MIT License.*/(function(m){if(!(/iPhone|iPad|iPod/.test(navigator.platform)&&navigator.userAgent.indexOf("AppleWebKit")>-1)){return}var l=m.document;if(!l.querySelector){return}var n=l.querySelector("meta[name=viewport]"),a=n&&n.getAttribute("content"),k=a+",maximum-scale=1",d=a+",maximum-scale=10",g=true,j,i,h,c;if(!n){return}function f(){n.setAttribute("content",d);g=true}function b(){n.setAttribute("content",k);g=false}function e(o){c=o.accelerationIncludingGravity;j=Math.abs(c.x);i=Math.abs(c.y);h=Math.abs(c.z);if(!m.orientation&&(j>7||((h>6&&i<8||h<8&&i>6)&&j>5))){if(g){b()}}else{if(!g){f()}}}m.addEventListener("orientationchange",f,false);m.addEventListener("devicemotion",e,false)})(this);

Answer 3

希望这会有所帮助......

<head>

<style type="text/css">
<!--

/*
    I began with the goal to prevent font scaling in Landscape orientation.
    To do this, see: http://stackoverflow.com/questions/2710764/

    Later, I just wanted to magnify font-size for the iPad, leaving
    the iPhone rendering to the css code.  So ...

    (max-device-width:480px) = iphone.css
    (min-device-width:481px) and
        (max-device-width:1024px) and
            (orientation:portrait) = ipad-portrait.css
    (min-device-width:481px) and
        (max-device-width:1024px) and
            (orientation:landscape) = ipad-landscape.css
    (min-device-width:1025px) = ipad-landscape.css

*/

@media only screen and (min-device-width: 481px)
{
    html {
        -webkit-text-size-adjust: 140%;   /* none for no scaling */
    }
}

-->
</style>

</head>

Answer 4

jQuery mobile使用的修复程序在这里

https://github.com/scottjehl/iOS-Orientationchange-Fix

缩小的

/*! A fix for the iOS orientationchange zoom bug. Script by @scottjehl, rebound by @wilto.MIT / GPLv2 License.*/(function (a) { function m() { d.setAttribute("content", g), h = !0 } function n() { d.setAttribute("content", f), h = !1 } function o(b) { l = b.accelerationIncludingGravity, i = Math.abs(l.x), j = Math.abs(l.y), k = Math.abs(l.z), (!a.orientation || a.orientation === 180) && (i > 7 || (k > 6 && j < 8 || k < 8 && j > 6) && i > 5) ? h && n() : h || m() } var b = navigator.userAgent; if (!(/iPhone|iPad|iPod/.test(navigator.platform) && /OS [1-5]_[0-9_]* like Mac OS X/i.test(b) && b.indexOf("AppleWebKit") > -1)) return; var c = a.document; if (!c.querySelector) return; var d = c.querySelector("meta[name=viewport]"), e = d && d.getAttribute("content"), f = e + ",maximum-scale=1", g = e + ",maximum-scale=10", h = !0, i, j, k, l; if (!d) return; a.addEventListener("orientationchange", m, !1), a.addEventListener("devicemotion", o, !1) })(this);

完整来源

/*! A fix for the iOS orientationchange zoom bug.
 Script by @scottjehl, rebound by @wilto.
 MIT / GPLv2 License.
*/
(function(w){

    // This fix addresses an iOS bug, so return early if the UA claims it's something else.
    var ua = navigator.userAgent;
    if( !( /iPhone|iPad|iPod/.test( navigator.platform ) && /OS [1-5]_[0-9_]* like Mac OS X/i.test(ua) && ua.indexOf( "AppleWebKit" ) > -1 ) ){
        return;
    }

    var doc = w.document;

    if( !doc.querySelector ){ return; }

    var meta = doc.querySelector( "meta[name=viewport]" ),
        initialContent = meta && meta.getAttribute( "content" ),
        disabledZoom = initialContent + ",maximum-scale=1",
        enabledZoom = initialContent + ",maximum-scale=10",
        enabled = true,
        x, y, z, aig;

    if( !meta ){ return; }

    function restoreZoom(){
        meta.setAttribute( "content", enabledZoom );
        enabled = true;
    }

    function disableZoom(){
        meta.setAttribute( "content", disabledZoom );
        enabled = false;
    }

    function checkTilt( e ){
        aig = e.accelerationIncludingGravity;
        x = Math.abs( aig.x );
        y = Math.abs( aig.y );
        z = Math.abs( aig.z );

        // If portrait orientation and in one of the danger zones
        if( (!w.orientation || w.orientation === 180) && ( x > 7 || ( ( z > 6 && y < 8 || z < 8 && y > 6 ) && x > 5 ) ) ){
            if( enabled ){
                disableZoom();
            }           
        }
        else if( !enabled ){
            restoreZoom();
        }
    }

    w.addEventListener( "orientationchange", restoreZoom, false );
    w.addEventListener( "devicemotion", checkTilt, false );

})( this );

Answer 5

这似乎是iOS 4中的一个错误，可以使用以下Javascript代码补救，但是它会禁用用户进行缩放操作的能力：

https://gist.github.com/901295/229d163414e22ebb14a6a6ba0b9777118f02e52d

Answer 6

这个有效！

 <script >
// BUG orientation portrait/lanscape IOS //
if (navigator.userAgent.match(/iPhone/i) || navigator.userAgent.match(/iPad/i)) {
var viewportmeta = document.querySelector('meta[name="viewport"]');
if (viewportmeta) {
    viewportmeta.content = 'width=device-width, minimum-scale=1.0, maximum-scale=1.0, initial-scale=1.0';
    document.addEventListener('orientationchange', function () {
        viewportmeta.content = 'width=device-width, minimum-scale=0.25, maximum-scale=1';
    }, false);
  }
}
</script>

Answer 7

为了使脚本能够工作并绕过第二个手势轻微调整，就像在orienatation中更改事件一样，将max设置为1.00099而不是1.0

Answer 8

当你说它缩放页面时，是所有元素，还是文本字体大小？...为了修复你可以使用的字体大小：

html {
    -webkit-text-size-adjust: 100%;
}

Answer 9

我想出了一个不同的解决方案，让旋转时缩放为1，但允许用户进行缩放。基本上，当用户缩放时，javascript会更改视口缩放级别（并禁用本机浏览器缩放功能）。

请在此处查看：https://stackoverflow.com/a/11878932/436776

Answer 10

第一个修复程序适用于我，并进行了以下更改。

将初始比例更改为.8，最小值更改为.25，最大值更改为1.6。

使用“meta”标记

<meta name="viewport" content="width=device-width, initial-scale=1">


<script ="text/javascript">
if (navigator.userAgent.match(/iPhone/i) || navigator.userAgent.match(/iPad/i)) {
    var viewportmeta = document.querySelector('meta[name="viewport"]');
    if (viewportmeta) {
        viewportmeta.content = 'width=device-width, minimum-scale=.25, maximum-scale=1.6, initial-scale=.8';
        document.body.addEventListener('gesturestart', function () {
            viewportmeta.content = 'width=device-width, minimum-scale=0.25, maximum-scale=1.6';
        }, false);
    }
}

Answer 11

到meta：

%meta{content: "width=device-width, initial-scale=1.0, minimum-scale=0.25, maximum-scale=1.6, user-scalable=yes", name: "viewport"}

到全局脚本：

if navigator.platform.toLowerCase() is "ipad"
  viewport = $ "meta[name='viewport']"
  viewport_content = viewport.attr("content")

  # reset initial zoom
  viewport.attr "content", "width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=yes"
  setTimeout =>
    viewport.attr "content", viewport_content
  , 0

  # reset zoom on rotate
  timeout = null
  window.onorientationchange = ->
    clearTimeout timeout if timeout?
    viewport.attr "content", "width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=yes"
    timeout = setTimeout =>
      viewport.attr "content", viewport_content
    , 1000

从纵向旋转到横向时，iPad布局会向上扩展

11 个答案: