NSURLConnection doesn't call delegate methods

Question

Hello everybody, I saw similar questions here, but I couldn't find solution to my problem. I have a simple NSURLConnection in main thread (At least I didn't create any other threads), but my delegate methods aren't get called

[[[NSURLConnection alloc] initWithRequest:request delegate:self] autorelease];

and no methods called, e.g.

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
NSLog(@"didReceiveResponse");
}

self is also a delegate for NSXMLParser, but I think it should not be a problem, as I have this working in my other class in the same project. I checked everything 10 times already, but can't find any problem.

I've seen some hack to solve it here: http://www.depl0y.com/?p=345 but I don't like it, May be someone knows better solution? thanks

Answer 1

The autorelease is dangerous. The calls to the delegate are made after your function returns (asynchronously). Are you retaining it somewhere else?

Answer 2

You have to release the NSURLConnection object in the - (void)connectionDidFinishLoading:(NSURLConnection *)connection callback as pointed out in the Apple documentation, not elsewhere:

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
  // Do whatever you want here

  // Release the connection
  [connection release];
}

Don't release it with autorelease, as Lou Franco suggested.

If it is not the problem, then maybe you have to implement all the required methods in the delegate class:

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

- (void)connectionDidFinishLoading:(NSURLConnection *)connection

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

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

The delegate is retained by NSURLConnection so you don't have to worry about it.

Answer 3

The only reason I know is a separate thread (that is already terminated when the delegate methods are called).

Try to NSLog(@"Is%@ main thread", ([NSThread isMainThread] ? @"" : @" NOT"); right before the url connection creation...

Answer 4

Any other thoughts? I really need it to work, I created new project and this code works there, but when I'm creating other class in this project this code doesn't work. It's just driving me mad(((