Sample use of NWPathMonitor

NetworkConnectivityManager.swift

/// A class that checks and notifies an internect connectivity changes.
class NetworkConnectivityManager {

    /// The static singleton instance. You can use this throught `NetworkConnectivityManager.shared`.
    ///
    /// Creating several manager instances doesn't make sense, so we design it as singleton.
    static let shared = NetworkConnectivityManager()

    /// The static notification name that the notification is post when a network status change. The object is [NWPath.Status](https://developer.apple.com/documentation/network/nwpath/status)
    static let networkConnectivityDidChangeNotificationName = Notification.Name(rawValue: "_networkConnectivityDidChangeNotification")

    /// The object that monitors the network path.
    ///
    /// You can check the current path status by `pathMonitor.currentPath.status`.
    let pathMonitor = NWPathMonitor()

    /// The queue for which enqueues network updates.
    let monitoringQueue = DispatchQueue(label: "com.youDomain.NetworkConnectivityManager", qos: .utility)

    /// The boolean value indicating whether the current network connection is online.
    var isOnline: Bool {
        return pathMonitor.currentPath.status == .satisfied
    }

    private init() {
        pathMonitor.pathUpdateHandler = { path in
            NotificationCenter.default.post(name: Self.networkConnectivityDidChangeNotificationName, object: path.status)
        }
        pathMonitor.start(queue: monitoringQueue)
    }

    deinit {
        pathMonitor.cancel()
    }

}