Unwind segues for 2 View Controllers

Question

I have one button (back button) on a view controller. Simple so far. I have 2 view controllers with a table on each one. if a user selects a row from either table it goes

Answer 1

As Volk explained,

-(IBAction)devDismiss
    {
    NSLog(@" ------- dev dismiss .....");

    // for a custom segue unwind, you must do this...
    [self performSegueWithIdentifier:@"specialWord" sender:self];

    // "specialWord" is the identifier set on storyboard for the
    // custom unwind segue

    /* for a "default" unwind segue, do this...
    [self dismissViewControllerAnimated:YES completion:nil];
    Note, if you used a push segue, you should use
      [self.navigationController popViewControllerAnimated:YES]
    If you used a modal segue, you should use
      [self dismissViewControllerAnimated:YES completion:nil] "
    */
    }

Note that indeed, you must also use "specialWord" in your segueForUnwindingToViewController: override, which will be in the DESTINATION (that is to say the ORIGINAL) view controller, the one underneath, that is to say.

-(UIStoryboardSegue *)segueForUnwindingToViewController:
                          (UIViewController *)toViewController 
              fromViewController:(UIViewController *)fromViewController 
              identifier:(NSString *)identifier
    {
    NSLog(@"we're in _your class name_, segueForUnwindingToViewController %@",
      identifier);

    // for some unwinds, we have a custom unwind we want to use.
    // so, check the identifier:
    if ([identifier isEqualToString:@"specialWord"])
        {
        YourCustomUnwindSegue *sg = [[YourCustomUnwindSegue alloc] 
                           initWithIdentifier:identifier 
                           source:fromViewController 
                           destination:toViewController];
        return sg;
        }

    // don't forget the break-away "return" inside any macthes.

    // NSLog(@"note, if this message appears, it's likely you have a typo
    //  somewhere for 'specialWord' - unless you genuinely have a situation
    //  where it will also fall through to the 'default' unwind segue :O ");

    // BE SURE TO return the default unwind segue otherwise
    return [super segueForUnwindingToViewController:toViewController 
                                 fromViewController:fromViewController
                                         identifier:identifier];
    }