connection : didReceiveData is not called

问题

I am having a problem in NSURLConnection. My didRecieveData method is not being called . I dont know what's the problem. I also went through almost all the previous problems but nothing seems to solve.

Please help me out. This is my code.

      -(void)gettheJSONdata
     {
           NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:_serverAddress cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];

           [request setHTTPMethod: @"GET"];

           NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];

          NSLog(@"This is displayed");
     }

     -(void)connection:(NSURLConnection*)connection didReceiveData:(NSData *)data
     {
           NSLog(@"This is not displayed.");
           AppAppDelegate *JSONdata = (AppAppDelegate*)[[UIApplication sharedApplication] delegate];

           JSONdata.userloginJSONdata = [[NSData alloc] initWithData:data];

           NSError *error;

          _result = [NSJSONSerialization JSONObjectWithData:JSONdata.userloginJSONdata options:NSJSONReadingMutableContainers error: &error];

           NSString *test = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
           NSLog(@"Json data : %@",test);
     }

     -(void) connectionDidFinishLoading:(NSURLConnection*) connection
     {
           AppAppDelegate *resultofJSONdata = (AppAppDelegate*)[[UIApplication sharedApplication] delegate];

           resultofJSONdata.JSONdataresult = _result;
      }

回答1:

You didn't start the request. You need:

[connection start];

or

NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];

Edit: My comment below had the incorrect method name. Try implementing both:

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response

and

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error

And see if either of those are being hit.

回答2:

Finally I solved the problem. I didnt synthesize the JSONdataresult.

I didn't realise that this could cause a problem with NSURLConnection.

回答3:

in my case header was No connection didReceiveData not getting called ,be sure to add authorisation if it is required for request,

    [urlRequest setValue:[UserContext sharedInstance].requesthandler.reqHeader forHTTPHeaderField:@"Authorization"];

来源：https://stackoverflow.com/questions/10937215/connection-didreceivedata-is-not-called