Question

我有一个NSURLConnection从JSON Web服务获取数据，一切正常。我正在使用它向服务器发布内容并获得成功响应。

在调用之后我想启动另一个NSURLConnection来刷新数据，所以我在connectionDidFinishLoading方法中这样做，但是这个第二个连接在加载完成后没有调用connectionDidFinishLoading。

我不能从connectionDidFinishLoading方法中启动NSURLConnection吗？

编辑：下面是代码。我将NSURLConnection子类化为包含Tag NSString，调用新类NSURLConnectionHelper。我用它来区分哪个连接调用了connectionDidFinishLoading。

- (void)connectionDidFinishLoading:(NSURLConnectionHelper *)connection
{ 

        if([connection.Tag isEqual:@"NewMessage"]){

            NSString *jsonString = [[NSString alloc] initWithData:receivedNewMessageData encoding:NSASCIIStringEncoding];

            NSDictionary *results = [jsonString JSONValue];

            [jsonString release];

            [connection release];

            if ([[results objectForKey:@"MessageAdded"] isEqual:@"True"]) {

                User *newUser = [[User alloc] init];
                [newUser retrieveFromUserDefaults];

                if([newUser IsLoggedIn]){
                Message *message = (Message *)[messages objectAtIndex: 0];

                        NSString *urlAsString = // url for webservice goes here

                        NSURL *url = [NSURL URLWithString:urlAsString];
                        NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
                        NSURLConnectionHelper *connection1 = [[NSURLConnectionHelper alloc] initWithRequest:request delegate:self];
                        connection1.Tag = @"GetLatestMessages";

                        [request release];

                        if (connection1) {
                                receivedLatestMessagesData = [[NSMutableData data] retain];
                        } else {
                                // Inform the user that the connection failed.
                        }
                }            
            }
      }else if([connection.Tag isEqual:@"GetLatestMessages"]){
    //do some other stuff but this code is never reached
  }
}

Answer 1

我不熟悉NSURLConnectionHelper，但看起来你永远不会开始连接。

Answer 2

我最终在我的网络服务网址中留了一个空格，一旦我纠正它有效。

在connectionDidFinishLoading中创建一个新的NSURLConnection

2 个答案: