在UINavigationController堆栈中"弹出"多个视图控制器

func popToViewController(_ viewController: UIViewController, animated: Bool) -> [UIViewController]?

if let viewControllerToPopTo = self.navigationController?.viewControllers.first(where: { $0 is YourViewController }) {
    _ = self.navigationController?.popToViewController(viewControllerToPopTo, animated: true)
}

func setViewControllers(_ viewControllers: [UIViewController], animated: Bool)

if let viewControllerToPopTo = self.navigationController?.viewControllers.first(where: { $0 is YourViewController }),
   var viewControllers = self.navigationController?.viewControllers {
    if let index = viewControllers.firstIndex(of: viewControllerToPopTo) {
        viewControllers.removeSubrange(index+1..<viewControllers.count)
        self.navigationController?.setViewControllers(viewControllers, animated: true)
    }
}