我是这样做的

func showAlert() {
    let alert = UIAlertController(title: "Thanks!", message: "We'll get back to you as soon as posible.", preferredStyle: .alert)

    alert.addAction(UIAlertAction(title: "OK", style: .default, handler: { action in
        self.dismissView()
    }))

    self.present(alert, animated: true)
}

func dismissView() {
    navigationController?.popViewController(animated: true)
    dismiss(animated: true, completion: nil)
}

对于swift 3 您只需要编写下面这行代码

_ = navigationController?.popViewController(animated: true)

我可以通过在导航控制器的“viewDidDisappear”中写代码重定向到根页面，

override func viewDidDisappear(_ animated: Bool) { self.navigationController ?。popToRootViewController(动画:真) ｝

在这种情况下，你从UIViewController中呈现一个UIViewController，也就是。

// Main View Controller
self.present(otherViewController, animated: true)

简单地调用dismiss函数:

// Other View Controller
self.dismiss(animated: true)

斯威夫特3，斯威夫特4

if movetoroot { 
    navigationController?.popToRootViewController(animated: true)
} else {
    navigationController?.popViewController(animated: true)
}

navigationController是可选的，因为可能没有。

试试这个: 对于前面的视图使用这个:

navigationController?.popViewController(animated: true)  

弹出到根目录使用以下代码:

navigationController?.popToRootViewController(animated: true)