Unwind Segue for UINavigationController

Question

I have a simple UINavigationController which pushes a UIViewController onto the stack via a custom segue. I then implemented an IBAction on the first UIViewController to perform an unwind action and I implement segueForUnwindingToViewController. Unfortunately, the segueForUnwindingToViewController is not being called (I did confirm that canPerformUnwindSegue is being called on the first VC).

I have not seen any simple examples of this behavior. Can anyone please help? Thanks.

Here's the code from the root view controller of the NavigationController.

- (IBAction) unwindFromSegue:(UIStoryboardSegue *)segue {
// unwinds back to here
//[self performSegueWithIdentifier:@"UnwindToObjectManageSegue" sender:self];

}

- (BOOL)canPerformUnwindSegueAction:(SEL)action fromViewController:(UIViewController *)fromViewController
                     withSender:(id)sender {
return YES;
}

- (BOOL)shouldPerformSegueWithIdentifier:(NSString *)identifier sender:(id)sender {
return YES;
}

- (UIStoryboardSegue *)segueForUnwindingToViewController:(UIViewController *)toViewController
                                  fromViewController:(UIViewController *)fromViewController
                                          identifier:(NSString *)identifier {
ObjectManageObjectDetailSegue *segue = [[ObjectManageObjectDetailSegue alloc] initWithIdentifier:identifier source:fromViewController destination:toViewController];
[segue setUnwinding:YES];
return segue;
}

I assume that you followed the steps from this answer but things did not work for you, correct? — Sergey Kalinichenko
That's correct. I followed that to a T. Unfortunately, my unwind segue is not being called. The identifier is being sent correctly, but it the segue itself is never invoked. — Clay
It would be great if someone could maybe post a sample project which exemplifies what was posted in that thread. I think it's a great example, but it's rather spread out. — Clay
Where are you trying to unwind to? You say you're unwinding from the first view controller. Do you mean the root view controller of the navigation controller? — rdelmar

matrinox matrinox · Accepted Answer · 2013-06-25T06:04:10

I had the same problem and I finally found a solution: https://github.com/simonmaddox/CustomUnwindSegue

He also had a problem with it not being called. Turns out that any view controller that is in a UINavigationController will not call the presenting view controller but the UINavigationController instead. This means you must subclass that UINavigationController and add that method there instead.

Unwind Segue for UINavigationController

1 Answers