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我仅在 iOS 6 中面临解析失败的问题。该代码适用于 iOS 6 的早期版本，但不适用于 iOS 6。我正在尝试将登录请求发送到服务器 url。我收到来自服务器的 xml 格式的响应。我正在使用 NSXMLParser 来解析响应。我能够在 iOS 3.x、iOS 4.x 和 iOS 5.x 中解析 xml，但在 iOS 6 中解析失败。

我正在使用这些行

NSXMLParser *m_parser = [[NSXMLParser alloc] initWithData:urlData]; 
[m_parser setDelegate:self];
BOOL parseFlag = [m_parser parse];//parsing failed in iOS 6

在 iOS 6 中只- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError被调用。

我得到的错误是 NSXMLParserErrorDomain 错误 68。

详细的源代码如下。

-(IBAction)loginButtonPressed:(id)sender
{

         NSMutableString *urlString = [[@"someURL" mutableCopy] autorelease];
        [urlString appendString:@"loginAuthenticate"];
        [urlString appendFormat:@"?username=%@",m_username.text];
        [urlString appendFormat:@"&password=%@",pwd];
        NSURL *url = [NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];

        NSString *postLength = [NSString stringWithFormat:@"%d", [urlString length]];

        NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
        [request setURL:url];
        [request setHTTPMethod:@"POST"]; 

        [request setValue:postLength forHTTPHeaderField:@"Content-Length"]; 
        [request setValue:@"text/xml; charset=utf-16" forHTTPHeaderField:@"Content-Type"];
        [request setHTTPBody:[urlString dataUsingEncoding:NSUTF16StringEncoding]];

        NSError *error; 
        NSURLResponse *response;
        NSData *urlData;
        urlData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

        NSString *responseXml = [[NSString alloc] initWithData:urlData encoding:NSUTF16StringEncoding];

        if (responseXml &&[responseXml length]>0) 
            {


             NSXMLParser    *m_parser = [[NSXMLParser alloc] initWithData:urlData]; 
            [m_parser setDelegate:self];

                    NSLog(@"urlData:%@",m_parser);
                    BOOL parseFlag = [m_parser parse];//parsing failed in iOS 6

                    if (parseFlag == 1)
                         NSLog(@"parseFlag = YES");//called if iOS version is less than iOS 6
                    else
                    {
                        NSLog(@"parseFlag = NO");//called if iOS version is iOS 6
                    }
                    .
                    .

        }

    // This delegate method is called in iOS 6 only
    - (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError {

        NSLog(@"%@",@"parseErrorOccured");
        NSLog(@"parseError:%@",parseError);
        //error is NSXMLParserErrorDomain error 68
    }
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