检测并自定义UIWebView的“无法读取文档”错误 [英] Detect and Customize UIWebView's "Unable to Read Document" error

问题描述

我正在测试一个包含许多不同文档类型的UIWebview - .xlsx，.jpg等 - 它打开了大部分文档就好了。我不时会打开一个本地文件，这条消息会出现在网页视图中：

I'm testing a UIWebview with a number of different document types - .xlsx, .jpg, etc. - and it opens most of them just fine. From time to time, I open a local file and this message appears right in the web view:

Unable to Read Document
An error occurred while reading the document

我不关心为什么发生此错误 - 例如，当我向UIWebView提供垃圾文件（故意）时，就会发生这种情况。问题是我无法弄清楚如何检测何时发生这种情况。它不会触发 webView：didFailLoadWithError ，它不会触发 NSException （通过 @try & @catch ），当我在 webViewDidFinishLoad 中检查文档时， webView.request.HTTPBody 为空。

I'm not concerned with "why" this error occurs - it happens, for instance, when I feed the UIWebView a garbage file (intentionally). The problem is that I can't figure out how to detect "when" this happens. It doesn't trigger webView:didFailLoadWithError, it doesn't trigger an NSException (via @try & @catch), and when I inspect the document in webViewDidFinishLoad, webView.request.HTTPBody is null.

任何人都知道如何检测UIWebView何时无法显示内容？

Anyone know how to detect when UIWebView can't display content?

推荐答案

just call uiwebview delegate method 

- (void)webViewDidStartLoad:(UIWebView *)webView
{

}
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
    NSString *html = [webView stringByEvaluatingJavaScriptFromString:
                      @"document.body.innerHTML"];
    if ([html rangeOfString:@"Unable to Read Document."].location == NSNotFound) {

       NSLog(@"NO Error");

    }
    else
    {
//        NSLog(@"File contains Error");
    }

}

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