import UIKit

extension UIAlertController {

    //在指定视图控制器上弹出普通消息提示框

    static func showAlert(message: String, in viewController: UIViewController) {

        let alert = UIAlertController(title: nil, message: message, preferredStyle: .alert)

        alert.addAction(UIAlertAction(title: "确定", style: .cancel))

        viewController.present(alert, animated: true)

    }

    //在根视图控制器上弹出普通消息提示框

    static func showAlert(message: String) {

        if let vc = UIApplication.shared.keyWindow?.rootViewController {

            showAlert(message: message, in: vc)

        }

    }

    //在指定视图控制器上弹出确认框

    static func showConfirm(message: String, in viewController: UIViewController,

                            confirm: ((UIAlertAction)->Void)?) {

        let alert = UIAlertController(title: nil, message: message, preferredStyle: .alert)

        alert.addAction(UIAlertAction(title: "取消", style: .cancel))

        alert.addAction(UIAlertAction(title: "确定", style: .default, handler: confirm))

        viewController.present(alert, animated: true)

    }

    //在根视图控制器上弹出确认框

    static func showConfirm(message: String, confirm: ((UIAlertAction)->Void)?) {

        if let vc = UIApplication.shared.keyWindow?.rootViewController {

            showConfirm(message: message, in: vc, confirm: confirm)

        }

    }

}

        let alert = UIAlertController(title: nil, message: "确定要退出登录吗？", preferredStyle: .actionSheet)

        /// 确认

        let sureAction = UIAlertAction(title: "确认", style: UIAlertAction.Style.default) { [weak self](_) in

             self?.requestLoginOut()

        }

        sureAction.setValue(UIColor.init(hexString: "#FF9E3E"), forKey: "_titleTextColor")

        alert.addAction(sureAction)

        //取消操作

        let cancleAction = UIAlertAction(title: "取 消", style: .cancel, handler: nil)

        cancleAction.setValue(UIColor.init(hexString: "#424242"), forKey: "_titleTextColor")

        alert.addAction(cancleAction)

        self.present(alert, animated: true, completion: nil)