Question

I am trying to post a URL to the server using the Asynchronous type like

_urlConn = [[NSURLConnection alloc] initWithRequest:_urlReq delegate: self];

I getting proper response, and I am handling the response well using the delegate methods such as didRecieveResponse and connectionDidFinishLoading. The flow works fine as of now. I am facing a new problem which I couldn’t figure it out clearly.

Lets say I am having a button which will post the same URL.

1. I am clicking button to post the url
2. When the button is clcked again(within one/two sec), the URL is not
   posted (I have written logic).
3. The URL is posted(For the fist button click) and I didn’t received
   any response till now, now I am trying to click the button again
   which will post the URL now.

My app getting exactly right here. Is it because I am using the _ReleaseObject(_urlConn); in the connectionDidFinishLoading method ????

Answer 1

You need to be very careful when working with delegate callbacks.

In this example, a single object is the delegate for two simultaneous NSURLConnection objects. This is a bad idea. Unless you develop a way of associating a specific connection with the appropriate response data object, you will end up mixing response data. In this case you make things worse for yourself by using _urlConn (an iVar i assume) instead of connection (the parameter passed to -connectionDidFinishLoading:).

To simplify all of this, you need to either not make a new request when an existing request is pending, or you need to cancel the old request before you start a new request.