blocks|key|618161|text|您可以在webViewDidFinishLoad方法中检查加载和请求属性|type|unstyled|depth|inlineStyleRanges|entityRanges|data|618162|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 could check the loading and request properties in the webViewDidFinishLoad method

blocks|key|1878263|text|您可以执行以下操作来检查加载何时完成。因为您可以在同一个页面上包含许多内容，所以您需要它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1878264|-+(void)webViewDidFinishLoad:(UIWebView+*)webview++{
++++if+(webview.isLoading)
++++++++return;
++++//+do+some+work
}|code-block|syntax|javascript|1878265|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can do something like this to check when loading is finished. Because you can have a lot of content on the same page you need it.

<pre><code>- (void)webViewDidFinishLoad:(UIWebView *)webview {
 if (webview.isLoading)
 return;
 // do some work
}
</code></pre>

blocks|key|2026144|text|(如果您还没有走到这一步)+NSLog加载开始和结束的跟踪可能是有启发性的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2026145|++++-+(BOOL)webView:(UIWebView+*)webView+shouldStartLoadWithRequest:(NSURLRequest+*)request+navigationType:(UIWebViewNavigationType)navigationType+{
+++++++NSLog(@"Loading:+%25@",+[request+URL]);
+++++++return+YES;
++++}


++++-+(void)webViewDidFinishLoad:(UIWebView+*)webView+{
+++++++NSLog(@"didFinish:+%25@;+stillLoading:+%25@",+[[webView+request]URL],
++++++++++++(webView.loading?@"YES":@"NO"));
++++}


++++-+(void)webView:(UIWebView+*)webView+didFailLoadWithError:(NSError+*)error+{
+++++++NSLog(@"didFail:+%25@;+stillLoading:+%25@",+[[webView+request]URL],
++++++++++++(webView.loading?@"YES":@"NO"));
++++}|code-block|syntax|javascript|2026146|我只是在我的一个项目中查看了对这三个项目的调用，该项目从我的包中加载了一个帮助页面，并包含嵌入式资源(外部css、YUI！、图像)。唯一通过的请求是初始页面加载，任何依赖项都不会调用shouldStartLoadWithRequest。所以很奇怪为什么你的didFinishLoad会被多次调用。|offset|length|style|CODE|2026147|也许您所看到的是由于重定向，或者正如前面提到的，是由于加载的页面中的ajax调用。但您至少应该能够平衡对shouldStartLoad和其他两个委托函数的调用，并能够确定加载何时完成。|2026148|entityMap^0|0|0|2J|Q|0|1G|F|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|V|8|@$I|W|J|X|K|L]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

It could be enlightening (if you haven't gone this far yet) to NSLog a trace of load starts and finishes.

<pre><code> - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
 NSLog(@"Loading: %@", [request URL]);
 return YES;
 }


 - (void)webViewDidFinishLoad:(UIWebView *)webView {
 NSLog(@"didFinish: %@; stillLoading: %@", [[webView request]URL],
 (webView.loading?@"YES":@"NO"));
 }


 - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
 NSLog(@"didFail: %@; stillLoading: %@", [[webView request]URL],
 (webView.loading?@"YES":@"NO"));
 }
</code></pre>

I just watched the calls to all three in one of my projects which loads a help page from my bundle and contains embedded resources (external css, YUI!, images). The only request that comes through is the initial page load, <code>shouldStartLoadWithRequest</code> isn't called for any of the dependencies. So it is curious why your didFinishLoad is called multiple times.

Perhaps what you're seeing is due to redirects, or as mentioned, ajax calls within a loaded page. But you at least should be able balance calls to <code>shouldStartLoad</code> and either of the other two delegate functions and be able to determine when the loading is finished.

blocks|key|2026196|text|我注意到了一些类似的东西，这是一个混乱:我有一个UITabBarController，它似乎在启动应用程序时预先加载了所有链接到它的标签页的ViewControllers+(尽管只显示了first_Tab_ViewController)，所以当几个标签页带有WebView的ViewController时，会调用它们各自的webViewDidFinishLoad，如果我复制了pasted：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2026197|NSLog(@"size+width+%250.0f+height+%250.0f",+fitingSize.width,+fittingSize.height);+|code-block|syntax|javascript|2026198|在一些情况下，我在console中得到了几个输出，这些输出看起来是双重调用，而实际上它们是在两个不同UIWebViews中进行单一调用。|2026199|entityMap^0|O|I|1Y|F|3T|E|4H|K|0|0|1E|A|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|N|$]]

I have notice something similar and it was a confusion: I have a <code>UITabBarController</code>, it seems to preload all <code>ViewControllers</code> linked to its tabs on launching the App (in spite of showing just first_Tab_ViewController), so when several tabs have <code>ViewController</code> with WebView their respective <code>webViewDidFinishLoad</code> are called and if I have copied pasted: 

<pre><code>NSLog(@"size width %0.0f height %0.0f", fitingSize.width, fittingSize.height); 
</code></pre>

in several, I get several output in console that appears to be a double calling when they really are single calling in two different <code>UIWebViews</code>.

blocks|key|1875895|text|这个问题已经解决了，但是我发现它缺少一个答案来解释为什么对webViewDidFinishLoad的多次调用实际上是预期行为|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1875896|前述方法在每次webview完成加载框架时被调用。从UIWebViewDelegate+protocol+documentation|1875897|1875898|+webViewDidFinishLoad:|blockquote|BOLD|1875899|1875900|在web视图完成加载框架后发送。|1875901|1875902|事实上，对于组成UIWebViewDelegate协议的所有其他方法也是如此。|1875903|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIWebViewDelegate_Protocol/Reference/Reference.html^0|T|K|0|Q|14|0|0|0|1|L|0|0|0|0|8|H|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|13|8|@]|D|@$9|14|A|15|1|16]]|E|$]]|$1|H|3|-4|5|6|7|17|8|@]|D|@]|E|$]]|$1|I|3|J|5|K|7|18|8|@$9|19|A|1A|B|L]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|1C|8|@]|D|@]|E|$]]|$1|P|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1E|8|@$9|1F|A|1G|B|C]]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]]]

This question is already solved, but I see it lacks an answer that actually explains why multiple calls to <code>webViewDidFinishLoad</code> are actually expected behavior

The aforementioned method is called every time the webview finishes loading a frame. From the <a href="https://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIWebViewDelegate_Protocol/Reference/Reference.html">UIWebViewDelegate protocol documentation</a>:

<blockquote>
 webViewDidFinishLoad: 
 Sent after a web view finishes loading a frame.
</blockquote>

In fact, this is also true for all the other methods that comprise the <code>UIWebViewDelegate</code> protocol.

blocks|key|575558|text|可能与此问题相关的是iOS6中引入的UIWebView属性：suppressesIncrementalRendering。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|575559|entityMap^0|U|U|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Possibly related to this issue is a property on UIWebView introduced in iOS6: <code>suppressesIncrementalRendering</code>.

blocks|key|1875947|text|检查这一点，它的实现方式很简单，不需要写太多代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1875948|-+(void)webViewDidFinishLoad:(UIWebView+*)webView+{
++++++++if+([[webView+stringByEvaluatingJavaScriptFromString:@"document.readyState"]+isEqualToString:@"complete"])+{
++++++++++++//+UIWebView+object+has+fully+loaded.
++++++++}
++++}|code-block|syntax|javascript|1875949|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Check this one it so simply and easy way to achieve no need to write too much code: 

<pre><code>- (void)webViewDidFinishLoad:(UIWebView *)webView {
 if ([[webView stringByEvaluatingJavaScriptFromString:@"document.readyState"] isEqualToString:@"complete"]) {
 // UIWebView object has fully loaded.
 }
 }
</code></pre>

blocks|key|575395|text|试试这个，会很好用的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|575396|+-(void)webViewDidFinishLoad:(UIWebView+*)webview++
++++{
+++++++if+(webview.isLoading)
+++++++++++return;
+++++++else
+++++++{
+++++++++++//+Use+the+code+here+which+ever+you+need+to+run+after+webview+loaded+
+++++++}
++++}|code-block|syntax|javascript|575397|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this it will work fine

<pre><code> -(void)webViewDidFinishLoad:(UIWebView *)webview 
 {
 if (webview.isLoading)
 return;
 else
 {
 // Use the code here which ever you need to run after webview loaded 
 }
 }
</code></pre>

blocks|key|575413|text|这是因为每次框架加载完成时都会调用回调方法。为了防止这种情况，请将webview的"suppressesIncrementalRendering“属性设置为true。这将阻止webview呈现，直到整个数据加载到内存中。这对我来说很管用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|575414|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|$]]

This happens because the callback method is called every time a frame is done loading. In order to prevent this set the "suppressesIncrementalRendering" property of the webview to true. this will prevent the webview from rendering until the entire data is loaded into the memory. This did the trick for me

I have some code that needs to run after the a <code>UIWebView</code> finishes loading a document. For that I've set the <code>UIWebView</code>'s delegate to my controller, and implemented the <code>webViewDidFinishLoading</code> method.

This gets called multiple times, depending on the type of page to load. I'm not sure if it's because of ajax requests, requests for images, or maybe even iframes.

Is there a way to tell that the main request has finished, meaning the HTML is completely loaded?

Or perhaps delay my code from firing until all of those events are done firing?

UIWebView didFinishLoading fires multiple times

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一些代码需要在UIWebView加载完文档后运行。为此，我将UIWebView的委托设置为我的控制器，并实现了webViewDidFinishLoading方法。它会被多次调用，这取决于要加载的页面类型。我不确定是不是因为ajax请求，图像请求，甚至是iframe。有没有一种方法可以告诉我们主请求已经完成，这意味着...

问UIWebView didFinishLoading多次触发
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