This method allow you to go back the nearest ViewController of type T

UIViewControllerExtension.swift

import UIKit

extension UIViewController {
    
    /// This method allow you to go back the nearest ViewController of type T
    ///
    /// - Parameter type: the type of the target ViewController
    /// - Returns: true if the method succeded, false if the user has to take extra actions to go back to the previous ViewController
    func back<T: UIViewController>(to type: T.Type) -> Bool {
        
        if self is T {
            // the current ViewController is already the target ViewController
            // no action required
            return true
        }
        else if presentingViewController is T {
            // the target ViewController is presenting the current ViewController
            // we have to dismiss the current ViewController
            dismiss(animated: true)
            return true
        }
        else if navigationController?.topViewController is T {
            // the current ViewController is a NavigationController
            // and the topViewController is the target ViewController
            // no action required
            return true
        }
        else if let navigationController = navigationController,
            let targetViewController = navigationController.viewControllers.first(where: { $0 is T }) {
            // the target ViewController is the parte of the navigation stack
            // of a NavigationController of the current ViewController
            // we have to dismiss the current ViewController
            
            navigationController.popToViewController(targetViewController, animated: false)
            return true
        }
        else if (presentingViewController as? UINavigationController)?.topViewController is T {
            // the target ViewController is the topViewController
            // of a NavigationController that is presenting the current ViewController
            // we have to dismiss the current ViewController
            dismiss(animated: true)
            return true
        }
        else if let navigationController = (presentingViewController as? UINavigationController),
            let targetViewController = navigationController.viewControllers.first(where: { $0 is T }) {
            // the target ViewController is the parte of the navigation stack
            // of a NavigationController that is presenting the current ViewController
            // we have to dismiss the current ViewController
            
            navigationController.popToViewController(targetViewController, animated: false)
            return true
        }
        
        return false
    }
}

good extension...thanks!