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func networkStatusDidChange(status: Reachability.NetworkStatus) {

    switch status {
    case .notReachable:
        debugPrint("ViewController: Network became unreachable")
    case .reachableViaWiFi:
        debugPrint("ViewController: Network reachable through WiFi")
    case .reachableViaWWAN:
        debugPrint("ViewController: Network reachable through Cellular Data")
    }

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extension ViewController: NetworkStatusListener {
    
    func networkStatusDidChange(status: Reachability.NetworkStatus) {
        
        switch status {
        case .notReachable:
            debugPrint("ViewController: Network became unreachable")
        case .reachableViaWiFi:
            debugPrint("ViewController: Network reachable through WiFi")
        case .reachableViaWWAN:

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override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    ReachabilityManager.shared.addListener(listener: self)
}

override func viewDidDisappear(_ animated: Bool) {
    super.viewDidDisappear(animated)
    ReachabilityManager.shared.removeListener(listener: self)
}

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// IBOutlets
@IBOutlet var loginButton: UIButton!

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// Start
ReachabilityManager.shared.startMonitoring()
// Stop
ReachabilityManager.shared.stopMonitoring()

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/// Called whenever there is a change in NetworkReachibility Status
///
/// — parameter notification: Notification with the Reachability instance
func reachabilityChanged(notification: Notification) {

    let reachability = notification.object as! Reachability

    switch reachability.currentReachabilityStatus {
    case .notReachable:
        debugPrint("Network became unreachable")

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// Sending message to each of the listeners
for listener in listeners {
    listener.networkStatusDidChange(status: reachability.currentReachabilityStatus)
}

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/// Adds a new listener to the listeners array
///
/// - parameter delegate: a new listener
func addListener(listener: NetworkStatusListener){
    listeners.append(listener)
}

/// Removes a listener from listeners array
///
/// - parameter delegate: the listener which is to be removed

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  // 6. Array of delegates which are interested to listen to network status change
  var listeners = [NetworkStatusListener]()

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/// Protocol for listenig network status change
public protocol NetworkStatusListener : class {
    func networkStatusDidChange(status: Reachability.NetworkStatus)
}