我正在尝试避免在 UIWebView 的委托时返回错误时产生的问题。我在委托实现中有共同的解决方法(我在互联网上的任何地方看到过)
I'm trying to avoid the problem generated while UIWebView's delegate returns an error like that. I have the common workaround (I saw it anywhere in the Internet) in my delegate implementation
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error { if ([error code] == NSURLErrorCancelled) return; }我遇到的问题是这并不总是有效。有时加载网页,另一次加载网页的一部分(标题,文本的一部分......),有几次不加载任何东西。
The problem I have is that this does not works always. Sometimes loads the web, another times loads parts of the web (the header, a part of the text...) and several times does not load anything.
有没有任何其他解决方案?存在任何正常运行的浏览器的开源实现?
Is there any other solution to this? Exists any open source implementation of a browser that works properly?
推荐答案来自Apple文档:
NSURLErrorCancelled(-999)
NSURLErrorCancelled (-999)
取消异步加载时返回.Web Kit框架委托将收到此信息在加载资源上执行取消操作时出错。请注意,如果取消下载,NSURLConnection或NSURLDownload委托将不会收到此错误。
"Returned when an asynchronous load is canceled. A Web Kit framework delegate will receive this error when it performs a cancel operation on a loading resource. Note that an NSURLConnection or NSURLDownload delegate will not receive this error if the download is canceled."
因此,最有可能发生这种情况的原因是,在第一个请求完成之前,您需要加载一个请求,然后加载另一个请求(或同一个请求)。这可能发生。例如,如果你在 viewDidAppear这样的方法中调用 loadRequest (或 loadHTMLString ):可以多次调用。如果你快速点击 UIWebView 中的2个链接,也会发生这种情况。
So, the most likely case for this to happen is for you to load a request and then another one (or the same one), before the first one is completed. This can happen. e.g., if you call loadRequest (or loadHTMLString) in a method like viewDidAppear: that can be called multiple times. This has also been reported to happen if you quickly tap 2 links in the UIWebView.
所以,一般建议是审查如何以及在何处调用 loadRequest (或 loadHTMLString ),并可能提供一些代码。
So, the general suggestion is to review how and where you call loadRequest (or loadHTMLString), and possibly provide some code.
为了解决这个问题,我建议将以下跟踪添加到您的网络视图代理中:
In order to troubleshoot this, I would suggest to add the following traces to your web view delegate:
- (void)webViewDidStartLoad:(UIWebView *)webView { NSLog(@"Starting to download request: %@", [webView.request.URL absoluteString]); } - (void)webViewDidFinishLoad:(UIWebView *)webView { NSLog(@"Finished downloading request: %@", [webView.request.URL absoluteString]); } - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error { if ([error code] == NSURLErrorCancelled) NSLog(@"Canceled request: %@", [webView.request.URL absoluteString]); }如果你检查输出,你应该更清楚地看到发生了什么。如果您粘贴输出,我们可以尝试进一步帮助您。
If you inspect the output, you should see more clearly what is going on. If you paste the output, we could try and help you further.
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