import RxSwift

import RxCocoa

import Network

class NetworkAuthorizationManager {

    let isAuthorized = BehaviorRelay<Bool>(value: false)

    init() {

        checkNetworkAuthorization()

    }

    private func checkNetworkAuthorization() {

        let monitor = NWPathMonitor()

        monitor.pathUpdateHandler = { path in

            self.isAuthorized.accept(path.status ==.satisfied)

        }

        let queue = DispatchQueue(label: "NetworkMonitor")

        monitor.start(queue: queue)

    }

}

class YourViewController: UIViewController {

    let disposeBag = DisposeBag()

    let networkAuthorizationManager = NetworkAuthorizationManager()

    override func viewDidLoad() {

        super.viewDidLoad()

        networkAuthorizationManager.isAuthorized

          .subscribe(onNext: { authorized in

                if authorized {

                    // 加载页面数据

                } else {

                    // 显示系统弹出层请求网络授权

                    let alertController = UIAlertController(title: "网络授权", message: "应用需要网络权限以正常工作，请前往设置授予权限", preferredStyle:.alert)

                    alertController.addAction(UIAlertAction(title: "确定", style:.default, handler: { _ in

                        if #available(iOS 10.0, *) {

                            UIApplication.shared.open(URL(string: UIApplication.openSettingsURLString)!, options: [:], completionHandler: nil)

                        } else {

                            UIApplication.shared.openURL(URL(string: UIApplication.openSettingsURLString)!)

                        }

                    }))

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

                }

            })

          .disposed(by: disposeBag)

    }

}