即使页面稍后加载，也使用 UIWebView 调用 didFailLoadWithError

问题描述

我有一个 UIViewController，它是一个 UIWebViewDelegate，里面有一个 UIWebView.我正在尝试加载特定的 URL

I have a UIViewController which is a UIWebViewDelegate and has a UIWebView inside of it. I am trying to load a particular URL

    NSURL *url = [NSURL URLWithString:urlAddress];
    NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
    [webView loadRequest:requestObj];
    [self.view addSubview:webView];
    [webView release];

但是didFailLoadWithErrordelegate方法几乎是瞬间被调用，错误对象是:

But the didFailLoadWithErrordelegate method is almost instantly called, and the error object is:

Did fail load with error: Error Domain=NSURLErrorDomain Code=-999 "The operation couldn’t be completed. (NSURLErrorDomain error -999.)" UserInfo=0x1a66c0 {NSErrorFailingURLKey=www.somewebsite.com, NSErrorFailingURLStringKey=www.somewebsite.com}

但是不久之后，您可以看到网站加载正常.

However a short time after, you can see that the website loads just fine.

为什么调用fail方法?以及无论网站是否实际失败，我如何知道它何时实际失败以及何时调用该方法?

Why is the fail method being called? And how do I know when it has actually failed versus when the method was called regardless of if the website actually failed or not?

推荐答案

当页面通过 javascript 或其他方式立即重定向时，您会收到此错误

You can get this error when the page is instantly redirected via javascript or somehow else

您可以通过此处的答案避免显示错误:如何修复 iPhone 3.0 操作系统中的 NSURLErrorDomain 错误 -999

You can avoid showing the error by answer from here: How do I fix NSURLErrorDomain error -999 in iPhone 3.0 OS

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if ([error code] != NSURLErrorCancelled) { //show error alert, etc. }

但我不知道如何识别它被调用的位置.

but I don't know how to recognize where it was invoked.

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