How to Check No-internet

install Pod 

pod 'ReachabilitySwift'


import Reachability
Class:- AppDelegate
Methods:- didFinishLaunchingWithOptions

        NotificationCenter.default.addObserver(self, selector:#selector(checkForReachability(notification:)), name: NSNotification.Name.reachabilityChanged, object:reachability)
        do{
            try reachability.startNotifier()
        } catch
        {
            
        }


    @objc func checkForReachability(notification:NSNotification)
    {
        let reach = notification.object as! Reachability
        //        if LanguageCode.language == "ar" {
        //            mainStoryBoard = UIStoryboard(name:"Arabic", bundle:nil)
        //        } else {
        mainStoryBoard = UIStoryboard(name:"Main", bundle:nil)
        //        }

        if ManagerClass.sharedInstance.isInternetAvailable() == false
        {
            print("No INternet")
            let noInternetVC :NoInternetVC = self.mainStoryBoard.instantiateViewController(withIdentifier: "NoInternetVC") as! NoInternetVC
            self.navController = UINavigationController(rootViewController: noInternetVC)
            self.window = UIWindow(frame: UIScreen.main.bounds)
            self.window?.rootViewController = navController
            self.window?.makeKeyAndVisible()

        }
    }




    func isInternetAvailable() -> Bool
    {
        var zeroAddress = sockaddr_in()
        //var zeroAddress = sockaddr_in(sin_len: 0, sin_family: 0, sin_port: 0, sin_addr: in_addr(s_addr: 0), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0))
        zeroAddress.sin_len = UInt8(MemoryLayout.size(ofValue: zeroAddress))
        zeroAddress.sin_family = sa_family_t(AF_INET)
        
        let defaultRouteReachability = withUnsafePointer(to: &zeroAddress)
        {
            $0.withMemoryRebound(to: sockaddr.self, capacity: 1) {zeroSockAddress in
                SCNetworkReachabilityCreateWithAddress(nil, zeroSockAddress)
            }
        }
        
        var flags = SCNetworkReachabilityFlags()
        
        if !SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags)
        {
            return false
        }
        
        let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0
        let needsConnection = (flags.rawValue & UInt32(kSCNetworkFlagsConnectionRequired)) != 0
        return (isReachable && !needsConnection)

    }

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