blocks|key|316826|text|您需要在控制器中实现viewForZoomingInScrollView方法，否则缩放将不起任何作用。(我真的不知道为什么需要这样做，但这就对了。)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|316827|详细信息请参见http://developer.apple.com/iphone/library/documentation/WindowsViews/Conceptual/UIScrollView_pg/ZoomZoom/ZoomZoom.html。|offset|length|316828|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.apple.com/iphone/library/documentation/WindowsViews/Conceptual/UIScrollView_pg/ZoomZoom/ZoomZoom.html^0|0|7|3A|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

You need to implement the viewForZoomingInScrollView method in your controller, or zooming won't do anything. (I don't really know why this should be needed, but there you go.)

For detailed information, see <a href="http://developer.apple.com/iphone/library/documentation/WindowsViews/Conceptual/UIScrollView_pg/ZoomZoom/ZoomZoom.html" rel="nofollow noreferrer">http://developer.apple.com/iphone/library/documentation/WindowsViews/Conceptual/UIScrollView_pg/ZoomZoom/ZoomZoom.html</a>.

blocks|key|316830|text|要在UIWebView上工作，必须为任何收缩和缩放设置scalesPageToFit=YES|type|unstyled|depth|inlineStyleRanges|entityRanges|data|316831|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You MUST set scalesPageToFit=YES for any pinching and zooming to work on a UIWebView

blocks|key|3275949|text|好的，你需要做以上两件事，但也要做下面的事情。我在主视图中有一个web视图，但这不起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3275950|3275951|如上所述，您首先需要在主视图中放置一个UIScrollView，然后将web视图放在滚动视图中。|ordered-list-item|3275952|如上所述，在视图控制器中实现<UIScrollViewDelegate>，在界面生成器中将滚动视图委托拖到视图控制器中，然后实现viewForZoomingInScrollView方法。这必须返回指向UIScrollView的指针(返回并创建web视图和滚动视图的属性-将它们链接到NIB中的视图控制器。在滚动视图上，转到属性检查器，设置最大和最小缩放因子(我将0.5设置为5.0，这很好用)。在Web视图上，在Attributes+Inspector:|offset|length|style|CODE|3275953|In+IBOutlet+Web+View部分，选择Scales+Pages+to+Fit|3275954|在视图部分，选择for+|3275955|，“左上角”|3275956|在底部的视图部分，选中启用用户交互和启用多点触控的|3275957|3275958|entityMap^0|0|0|0|E|M|1S|Q|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|Y|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|Z|8|@$H|10|I|11|J|K]|$H|12|I|13|J|K]]|9|@]|A|$]]|$1|L|3|M|5|E|7|14|8|@]|9|@]|A|$]]|$1|N|3|O|5|E|7|15|8|@]|9|@]|A|$]]|$1|P|3|Q|5|E|7|16|8|@]|9|@]|A|$]]|$1|R|3|S|5|E|7|17|8|@]|9|@]|A|$]]|$1|T|3|-4|5|6|7|18|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|V|$]]

OK, you need to do both the above, but also the following. I had a web view in the main view, and that didn't work.

<ol>
<li>As above, you first have to put a UIScrollView in the main view, then put the web view in the scroll view.</li>
<li>As above, implement <code>&lt;UIScrollViewDelegate&gt;</code> in your view controller, drag the scroll view delegate to the view controller in Interface Builder, and implement the <code>viewForZoomingInScrollView</code> method. This must return the pointer to the UIScrollView (return myScrollView).</li>
<li>I created IBOutlet properties for both the web view and the scroll view - link them in the NIB to your view controller.</li>
<li>On the Scroll View, go to the Attributes Inspector, set your Max and Min zoom factors (I set 0.5 to 5.0, that works well).</li>
<li>On the Web View, in the Attributes Inspector:</li>
<li>In the Web View section, select Scales Pages To Fit</li>
<li>In the View section, select for Mode, "Top Left"</li>
<li>In the View section at the bottom, check off User Interaction Enabled, and Multiple Touch Enabled</li>
</ol>

blocks|key|314851|text|使用JavaScript，你可以控制缩放级别，尽管我发现的oly解决方案看起来并不流畅。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|314852|假设你在<head>中有|offset|length|style|CODE|314853|<meta+id="vp"+name="viewport"+content="width=768,initial-scale=1.0">|code-block|syntax|javascript|314854|要缩放到4倍，但仍允许用户更改缩放，请更改内容两次：|314855|var+vp+=+document.getElementById('vp');
vp.content+=+"width=767,minimum-scale=4.0,maximum-scale=4.0,user-scalable=yes";
vp.content+=+"width=768,minimum-scale=0.25,maximum-scale=10.0,user-scalable=yes";|314856|切换宽度是非常重要的-否则Mobile+Safari会有严重的重绘错误(由于过度优化)。|314857|您不能只是再次设置initial-scale+-它将在第二次被忽略。|314858|entityMap^0|0|4|6|0|0|0|0|0|9|D|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|12|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|14|8|@$D|15|E|16|F|G]]|9|@]|A|$]]|$1|U|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|V|$]]

With JavaScript you can control the zoom level, although the oly solution I have found doesn't look smooth.

Say you have in <code>&lt;head&gt;</code>:

<pre><code>&lt;meta id="vp" name="viewport" content="width=768,initial-scale=1.0"&gt;
</code></pre>

To zoom to 4x, and still allow the user to change zoom, change the content twice:

<pre><code>var vp = document.getElementById('vp');
vp.content = "width=767,minimum-scale=4.0,maximum-scale=4.0,user-scalable=yes";
vp.content = "width=768,minimum-scale=0.25,maximum-scale=10.0,user-scalable=yes";
</code></pre>

Toggling the width is very important - otherwise Mobile Safari has serious repainting bugs (due to over-optimisation).

You cannot just set <code>initial-scale</code> again - it is ignored the second time.

I have a <code>UIWebView</code> which inside a <code>UIScrollView</code> (scrollview contain another component)

I tried to enable multitouch both on Interface Builder or Programmatic on <code>UIWebView</code> but it still cannot zoom for html, do I need to handle both zoom in at the <code>UIScrollView</code> and <code>UIWebView</code>? Or anything I haven't to set?

How can I enable zoom in on UIWebView which inside the UIScrollView?

我在UIScrollView中有一个UIWebView (scrollview包含另一个组件)我尝试在界面生成器或编程的UIWebView上启用多点触摸，但它仍然不能放大html，我是否需要在UIScrollView和UIWebView上同时处理放大？或者有什么我不需要设置的？

问如何在UIScrollView中的UIWebView上启用放大功能？
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