gistfile1.m

// Check Twitter username & password
- (void)initiateCredentialCheckWithUsername:(NSString *)username password:(NSString *)password {
	self.authCID = [self.twitterEngine getXAuthAccessTokenForUsername:username password:password];
	self.twitterUsername = username;
}

- (void)requestFailed:(NSString *)requestIdentifier withError:(NSError *)error {
	NSLog(@"Request failed");
	NSLog(@"%@", requestIdentifier);
	NSLog(@"%@", error);
	
	// Failed to login
	if (self.authCID == requestIdentifier) {
		UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:@"Login Failure." message:@"You have failed to login" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:nil] autorelease];
		[alert show];
		
		[self.loginViewController.spinner stopAnimating];
	}
}