Question

I’m working on a view controller that can be presented modally or pushed into a navigation stack. I made it a UINavigationController subclass so that I get all the UIToolbar stuff for free. I can present it modally using:

[self presentModalViewController:myViewController animated:YES];

Problem is, UINavigationController doesn’t allow pushing another UINavigationController into it (makes sense), so this crashes it:

[self.navigationController pushViewController:myViewController animated:YES];

Would there be a way to detect how myViewController is presented and automatically have it switch between UINavigationController and UIViewController accordingly so that I don’t need 2 different classes?

In other words, myViewController would be able to detect how it’s getting presented and pushing it would come down to something like:

[self.navigationController pushViewController:myViewController.topViewController animated:YES];

NOTE: Something like this would probably do, but it’s getting too far away from the default UIViewController behaviors:

[myViewController pushIntoNavigationController:navController]; // only push myViewController.topViewController
[myViewController presentModallyInParentController:parentController]; // push the whole myViewController

Answer 1

In the myViewController subclass, create a method something like this:

- (void)presentFromViewController:(UIViewController *)presentingViewController
{
    if ([[presentingViewController class] isEqual:[UINavigationController class]])
        [presentingViewController pushViewController:self.topViewController animated:YES];
    else
        [presentingViewController presentModalViewController:self animated:YES];
}

Would this work or am I not understanding correctly?