UINavigationController+popBack.swift

import UIKit

public extension UINavigationController {
    func popBack(to vc: AnyClass, animated: Bool = true) {
        guard let elementFound = (viewControllers.filter { $0.isKind(of: vc) }).first else {
            assertionFailure("cannot pop back to \(vc) as it is not in the view hierarchy")
            return
        }
        self.popToViewController(elementFound, animated: animated)
    }
}