Problems calling performSegueWithIdentifier from connectionDidFinishLoading - ios

Question

I have a login screen and when a button is pressed this code executes:
- (IBAction)btnLogin:(id)sender {
[username resignFirstResponder];
[password resignFirstResponder];
Auth *authRequest = [[Auth alloc] init];
NSURL *url = [[NSURL alloc] initWithScheme:#"http" host:APIHOST path:#"/authenticate"];
[authRequest setUrl:url];
[authRequest setUsername:[username text]];
[authRequest setPassword:[password text]];
[authRequest authenticate];
[self performSegueWithIdentifier:#"Login2Tab" sender:self];
}
This works well and the segue executes as expected (So I know the segue exists and its identified correctly in the storyboard). I however don't want to perform the segue until the connection has finished loading so this implementation file is my delegate for NSURLConnection and at the bottom I have (and the if/else on responseCode does work)..:
// Close the connection
- (void)connectionDidFinishLoading:(NSURLConnection*)connection {
if(responseCode == 200) {
[self performSegueWithIdentifier:#"Login2Tab" sender:self];
} else {
NSLog(#"Bad.. bad.. bad...");
}
NSLog(#"Connection Closed.");
}
(When I put the performSegueWithIdentifer in the connectionDidFinishLoading I comment out the performSegueWithIdentier from above...).
But now the app always crashes stating:
* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Receiver (LoginViewController: 0x7163640) has no segue with identifier 'Login2Tab''
Which is where I am stuck because it works when its not called from within the connectionDidFinishLoading...

Answer 1

Just wanted to say I have this resolved altho I am not entirely sure how.
Basically this line in my ViewController
[authRequest authenticate];
Was loading a method in an external class file:
- (void)authenticate {
NSURL *url = [[NSURL alloc] initWithScheme:#"http" host:APIHOST path:#"/authenticate"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:3];
NSString *postString = [[NSString alloc] initWithFormat:#"email=%#&password=%#", [username text], [password text]];
[request setValue:APIKEY forHTTPHeaderField:#"apikey"];
[request setHTTPMethod:#"POST"];
[request setHTTPBody:[postString dataUsingEncoding:NSUTF8StringEncoding]];
[request setURL:url];
if ([NSURLConnection canHandleRequest:request]) {
NSLog(#"Starting network connection");
NSURLConnection *myConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[myConnection start];
} else {
//Error cannot activate network request from device
}
}
The delegates for the NSURLConnection were in the viewcontroller... and I could see them being accessed when the method was complete however I couldn't perform the segue from them. By moving this function from the class file to my viewcontroller I was able to call my segue's from the delegate method of connectionDidFinishLoading....
Strange but worked.