ios – 后台线程上的NSURLConnection委托方法

我想在后台进行一些Web服务通信.我使用Sudzc作为httprequests的处理程序,它的工作原理如下：

SudzcWS *service = [[SudzcWS alloc] init];
[service sendorders:self withXML:@"my xml here" action:@SELEctor(handleordersending:)];
[service release];

它将一些XML发送到Web服务,并在指定的选择器中处理响应(在这一个中,一个布尔值)：

- (void)handleordersending:(id)value
{ 
//some controls  
    if ([value boolValue] == YES)
    {
        //my stuff
    }
}

当我尝试在我的sendorders：withXML：action：方法上使用Grand Central Dispatch时,我注意到没有调用选择器.我相信原因是NSURLConnection委托消息被发送到创建连接的线程但是线程没有那么久,它在方法完成时结束,杀死任何给委托的消息.

问候

EDIT1
[请求发送]方法：

- (void) send {
//dispatch_async(BACkgroundQueue,^(void){
    // If we don't have a handler,create a default one
    if(handler == nil) {
        handler = [[SoapHandler alloc] init];
    }

    // Make sure the network is available
    if([SoapReachability connectedToNetwork] == NO) {
        NSError* error = [NSError errorWithDomain:@"SudzC" code:400 userInfo:[NSDictionary DictionaryWithObject:@"The network is not available" forKey:NSLocalizedDescriptionKey]];
        [self handleError: error];
    }

    // Make sure we can reach the host
    if([SoapReachability hostAvailable:url.host] == NO) {
        NSError* error = [NSError errorWithDomain:@"SudzC" code:410 userInfo:[NSDictionary DictionaryWithObject:@"The host is not available" forKey:NSLocalizedDescriptionKey]];
        [self handleError: error];
    }

    // Output the URL if logging is enabled
    if(logging) {
        NSLog(@"Loading: %@",url.absoluteString);
    }

    // Create the request
    NSMutableURLrequest* request = [NSMutableURLrequest requestWithURL: url];
    if(soapAction != nil) {
        [request addValue: soapAction forhttpHeaderField: @"SOAPAction"];
    }
    if(postData != nil) {
        [request sethttpR_960_11845@ethod: @"POST"];
        [request addValue: @"text/xml; charset=utf-8" forhttpHeaderField: @"Content-Type"];
        [request sethttpBody: [postData dataUsingEncoding: NSUTF8StringEncoding]];

        if(self.logging) {
            NSLog(@"%@",postData);
        }
    }


    //dispatch_async(dispatch_get_main_queue(),^(void){
        // Create the connection
        conn = [[NSURLConnection alloc] initWithrequest: request delegate: self];
        if(conn) {
                                        NSLog(@" POST DATA %@",receivedData);
            receivedData = [[NSMutableData data] retain];
                        NSLog(@" POST DATA %@",receivedData);
        } else {
            // We will want to call the onerror method SELEctor here...
            if(self.handler != nil) {
                NSError* error = [NSError errorWithDomain:@"Soaprequest" code:404 userInfo: [NSDictionary DictionaryWithObjectsAndKeys: @"Could not create connection",NSLocalizedDescriptionKey,nil]];
                [self handleError: error];
            }
        }
    //});


    //finished = NO;

    //    while(!finished) {
    //        
    //        [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
    //        
    //    }

//});
}

注释掉的部分是我尝试过的各种东西.最后一部分有效,但我不确定这是不是一个好方法.在类的NURLConnection委托方法中,会发生以下情况：

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
NSError* error;
if(self.logging == YES) {
    NSString* response = [[NSString alloc] initWithData: self.receivedData     encoding: NSUTF8StringEncoding];
    NSLog(@"%@",responsE);
    [response release];
}

CXMLDocument* doc = [[CXMLDocument alloc] initWithData: self.receivedData options: 0 error: &error];
if(doc == nil) {
    [self handleError:error];
    return;
}

id output = nil;
SoapFault* fault = [SoapFault faultWithXMLDocument: doc];

if([fault hasFault]) {
    if(self.action == nil) {
        [self handleFault: fault];
    } else {
        if(self.handler != nil && [self.handler respondsToSELEctor: self.action]) {

                [self.handler performSELEctor: self.action withObject: fault];


        } else {
            NSLog(@"SOAP Fault: %@",fault);
        }
    }
} else {
    CXMLNode* element = [[Soap getNode: [doc rootElement] withName: @"Body"] childATindex:0];
    if(deserializeTo == nil) {
        output = [Soap deserialize:element];
    } else {
        if([deserializeTo respondsToSELEctor: @SELEctor(initWithNode:)]) {
            element = [element childATindex:0];
            output = [deserializeTo initWithNode: element];
        } else {
            NSString* value = [[[element childATindex:0] childATindex:0] stringvalue];
            output = [Soap convert: value toType: deserializeTo];
        }
    }

    if(self.action == nil) { self.action = @SELEctor(onload:); }
    if(self.handler != nil && [self.handler respondsToSELEctor: self.action]) {


            [self.handler performSELEctor: self.action withObject: output];


    } else if(self.defaultHandler != nil && [self.defaultHandler respondsToSELEctor:@SELEctor(onload:)]) {
        [self.defaultHandler onload:output];
    }
}

[self.handler release];
[doc release];
[conn release];
conn = nil;
[self.receivedData release];
}

委托无法发送消息,因为当 – (void)发送完成时它将死亡.

解决方法

SudzcWS *service = [[SudzcWS alloc] init];
dispatch_async(aQueue,^{
    [sevice sendorders:self withXML:xml action:@SELEctor(handleordersending:)];
}
[service release];

SudzcWS *service = [[SudzcWS alloc] init];
dispatch_async(aQueue,^{
    [sevice sendorders:self withXML:xml action:@SELEctor(handleordersending:)];
}


- (void)handleordersending:(id)value
{ 
    //some controls  
    //your stuff
    [service release];
}