弹出到根视图控制器

Question

I have an alert whose OK button should pop to the root view controller.

Here's the structure of what I'm working with:

[tab view controller] -> [navigation controller] -> [view controller] -> [view controller] -> [navigation controller] -> [view controller] -> [alert]

I would like the OK button on the alert take me to the view controller I've bolded above. When I do the code below, I go back to the view controller I've italicized above, which isn't quite what I want. Any help would be much appreciated! Thanks!

alert.addAction(UIAlertAction(title: OK, style: UIAlertActionStyle.default, handler: { action in

    DispatchQueue.main.async(execute: {
        _ = self.dismiss(animated: true, completion: nil)

    })
}))

I have also tried using the special method for popping to the root view controller, but this has not worked, sadly.

Answer 1

The UINavigationViewController class has a method func popToRootViewController(animated: Bool) -> [UIViewController]? ( Documentation )

You can just call this method on the fist navigation view controller. (Note: Therefore you need to have a reference to this navigation view controller or delegates to call this method)

If you use a Storyboard you can use a segue to unwind to the correct view controller. Therefore see this post .

Answer 2

You need to navigate the particular index of navigate stack. Eg:- First get the count of view controllers present in navigation stack. Pop to particular index. In you case may be its index is 0:

let arr_controller:[UIViewController] = (self.navigationController?.viewControllers)!
_ = self.navigationController?.popToViewController(arr_controller[0], animated: true)

Answer 3

let tabVc = (UIApplication.shared.delegate as! AppDelegate).window?.rootViewController as? UITabBarController
tabVc?.selectedViewController?.navigationController?.popToRootViewController(animated: true)