Custom Unwind Segue for iOS 8 and iOS 9

Question

My question is, how do I get the following custom unwind segue to work on a device with a version prior to iOS 9 as well as on a device running iOS 9?

I

Answer 1

I slightly modified your code.
I don't have to consider whether push or modal.
It seems to work fine.

- (UIStoryboardSegue *)segueForUnwindingToViewController:(UIViewController *)toViewController fromViewController:(UIViewController *)fromViewController identifier:(NSString *)identifier
{
    UIStoryboardSegue *segue;
    if ([fromViewController isKindOfClass:[MyViewController class]]) {
        segue = [[CustomSegue alloc] initWithIdentifier:identifier source:fromViewController destination:toViewController]; //Custom Unwind Segue
    }
    else {
        if ([super respondsToSelector:@selector(unwindForSegue:towardsViewController:)]) {
            [super unwindForSegue:segue towardsViewController:toViewController];
        }
        segue = [super segueForUnwindingToViewController:toViewController fromViewController:fromViewController identifier:identifier];
    }

    return segue;
}