gistfile1.m

- (IBAction) login {
    
    NSLog(@"login");
    
    BAAClient *client = [BAAClient sharedClient];
    
    [client authenticateUser:self.loginUsernameField.text
                    password:self.loginPasswordField.text
               completion:^(BOOL success, NSError *error) {
                   
                   if (success) {
                       
                       NSLog(@"user authenticated %@", client.currentUser);
                       [self dismissViewControllerAnimated:YES completion:nil];
                       
                   } else {
                       
                       NSLog(@"error in logging in %@", error);
                       
                   }
                   
               }];
    
}