Question

I want to create a class to handle all the HTTP connection work for other classes(in order to avoid writing codes repeatedly). I call it ConnectionCenter(subclass of NSObject) and add the following codes to it:

-(void)connect:(NSString *)strURL obj:(ConnectCenter *)objConnect {     NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:strURL]                                               cachePolicy:NSURLRequestUseProtocolCachePolicy                                           timeoutInterval:60.0];      NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:objConnect];     if (theConnection)      {         // receivedData is declared as a method instance elsewhere         receivedData = [[NSMutableData data] retain];     }      else      {          // inform the user that the download could not be made     }  }  - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {     // append the new data to the receivedData     // receivedData is declared as a method instance elsewhere     [receivedData appendData:data]; } 

And other classes call it by passing a URL and an object of ConnectionCenter. But the method ‘didReceiveData’ in ConnectionCenter is not called. Any ideas about what’s the problem with it?

Answer 1

You’ll need to call [theConnection setDelegate:self] after you setup the connection, since connection:didReceiveData: is a delegate method.

Read the documentation for more info.