如何在不导入第一个UIViewController类的情况下从UINavigationController中的另一个UIViewController手动取消分配UIViewController？

Question

I've a navigationController. The first viewcontroller is a kind of class FirstViewController. When I tap a button in FirstViewController, it push in navigationController the second viewController that is a kind of class SecondViewController. When I tap a button in SecondViewController, I'd like to dealloc the FirstViewController (previously saved in navigationController) so as to start again as if it was the first time that I open the FirstViewController when I tap back button in navigationItem of SecondViewController. Here the code of the method called when I tap the button in secondViewController:

NSArray * navigationPath = [self.navigationController viewControllers];
UIViewController *previousVC = [navigationPath objectAtIndex:[navigationPath count]-2];
[previousVC performSelector:@selector(viewDidUnload)];

It doesn't dealloc the FirstViewController. There is a way to do it?

Answer 1

Create a new first view controller

FirstViewController *first = [[FirstViewController alloc]init];

Reset the navigation stack

[self.navigationController setViewControllers:@[first, self] animated:NO];

Navigate to first

[self.navigationController popViewController:YES];

Answer 2

You will need to reset the array of view controllers in the navigation controller.

In your second view controller:

[self.navigationController setViewControllers:@[self] animated:NO];