iphone - 测试 NSURLConnection 失败

Question

如何测试 NSURLConnection 的失败？

另外，如何判断是否由于飞行模式或 WiFi 关闭而失败？在我的测试中，虽然弹出警报告诉用户他们需要打开 WiFi，但如果他们忽略它，我的应用程序就会坐在那里并旋转等待响应。

Answer 1

如果您的连接委托(delegate)是 self，您可以这样做:

self.myConnection = [[[NSURLConnection alloc] initWithRequest:urlRequest delegate:self] autorelease];

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
   if ([error code] == kCFURLErrorNotConnectedToInternet)
    {
        // if we can identify the error, we can present a more precise message to the user.
        NSDictionary *userInfoDict = [NSDictionary dictionaryWithObject:@"No Connection Error"
                                                             forKey:NSLocalizedDescriptionKey];
        NSError *noConnectionError = [NSError errorWithDomain:NSCocoaErrorDomain
                                                         code:kCFURLErrorNotConnectedToInternet
                                                     userInfo:userInfoDict];
        [self handleError:noConnectionError];
    }
    else
    {
        // otherwise handle the error generically
        [self handleError:error];
    }
}