Question

This may sound a newbie question, however I’m new to iOS dev.

I’ve declared NSURLConnection* mImageUploadConnection as instance member.
And running following to create it.

mImageUploadConnection = [[NSURLConnection alloc] initWithRequest:someRequest delegate:self startImmediately:YES];

The retain count is 2 after allocation, why ? (This maybe Apple inner stuff, right? I still need to release connection only once ?).

I’m releasing connection in

 - didFailWithError
 - connectionDidFinishLoading

methods, but I also need to cancel the connection is some case, when user pops from current navigation view. I.e. The cancellation can take place while the mImageUploadConnection hasn’t finished or failed. I cancel connection in following way

if (mUploadeImagConnection != nil) {
    [mUploadeImageConnection cancel];  
    [mUploadeImagConnection release];
}

The connection gets cancelled correctly when is hasn’t finished or failed.
But the last code snippet fails (bad access) when connection has finished successfully, i.e. it has been released once.

• The retain count of mUploadeImagConnection is 1 when cancelling after
  connection finished successfully, why it is so ???
• How can I check in last code snippet if connection status was
  successful, and don’t send cancel message ?

Answer 1

Set your ivar to nil after you have released it.