Exploring UIAlertController in swift

AlertWithDistructive.swift

    /**
     Simple Alert with Distructive button
     */
    func showAlertWithDistructiveButton() {
        let alert = UIAlertController(title: "Sign out?", message: "You can always access your content by signing back in", preferredStyle: UIAlertControllerStyle.alert)

        alert.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.default, handler: { _ in
            //Cancel Action
        }))
        alert.addAction(UIAlertAction(title: "Sign out",
                                      style: UIAlertActionStyle.destructive,
                                      handler: {(_: UIAlertAction!) in
                                        //Sign out action
        }))
        self.present(alert, animated: true, completion: nil)
    }