第一种方法是当vc 1-> vc 2时关闭vc 2，从vc 1进入vc 3。第二种方法是按照你想要的方式进行。你想运行它吗？

extension UIViewController {
    
    func popAndPushViewController(goto: UIViewController) {
        if var vcArray = self.navigationController?.viewControllers {
            vcArray.removeLast()
            vcArray.append(goto)
            self.navigationController?.setViewControllers(vcArray, animated: true)
        }
    }

    func doublePopAndPushViewController(goto: UIViewController) {
        if var vcArray = self.navigationController?.viewControllers {
            vcArray.removeLast()
            vcArray.removeLast()
            vcArray.append(goto)
            self.navigationController?.setViewControllers(vcArray, animated: true)
        }
    }

}

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