NSURLConnection error not working - iphone

Question

I am trying to detect if there is an error in my request using the if statement on theConnection. It enters the first part if successful fine but does not enter the else if there is an error. I am not sure why.
- (void)vehicleSearchRequest:(NSData *)postBodyData
{
NSString *address = [NSString stringWithFormat:#"http://%#", serverAddress];
//Set database address
NSMutableString *databaseURL = [[NSMutableString alloc] initWithFormat:#"%#", address];
NSURL *url = [NSURL URLWithString:databaseURL];
NSString *postLength = [NSString stringWithFormat:#"%d", [postBodyData length]];
//SynchronousRequest to grab the data, also setting up the cachePolicy
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; //if request dose not finish happen within 60 second timeout.
// Set up request
[request setHTTPMethod: #"POST"];
[request setValue:postLength forHTTPHeaderField:#"Content-Length"];
[request setValue:#"application/octet-stream" forHTTPHeaderField:#"content-type"];
[request setHTTPBody:postBodyData];
[request setTimeoutInterval:180];
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:request delegate:self];
if (theConnection) {
// do animation thankyou here
NSLog(#"Sucsess!");
[self submitSuccessful];
} else {
// Inform the user that the connection failed from the connection:didFailWithError method
NSLog(#"Connectin ERROR!!!");
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Connection error, Please try again" message:nil delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alert show];
}
}

Answer 1

Your code checks to see whether it was able to instantiate an NSURLConnection or not. This is a useful safety check, but will only fail in practice if you pass it a URL that the system does not support.
The connection itself is asynchronous, and so will take a little while to tell you if there was a problem or not. Implement its delegate methods to hear back from the server.