Check for internet connection in iOS App Swift

Check Internet Connection if you are going in your application, Your Connection are Cellular & WIFI are ON/OFF.

First your create a Network swift class then implement where are you check connection on/off

let start:- a  create public class Reachability 

import Foundation

import UIKit

import SystemConfiguration

public class Reachability {

    

    class func isConnectedToNetwork() -> Bool {

        

        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 = SCNetworkReachabilityFlags(rawValue: 0)

        if SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) == false {

            return false

        }

        

        /* Only Working for WIFI

         let isReachable = flags == .reachable

         let needsConnection = flags == .connectionRequired

         

         return isReachable && !needsConnection

         */

        

        // Working for Cellular and WIFI

        let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0

        let needsConnection = (flags.rawValue & UInt32(kSCNetworkFlagsConnectionRequired)) != 0

        let ret = (isReachable && !needsConnection)

        

        return ret

        

    }

}

Now implement class Reachability into when open your application - ViewController

 override func viewDidAppear(_ animated: Bool) {

        

        if Reachability.isConnectedToNetwork(){

            print("Internet Connection Available!")

        }else{

            print("Internet Connection not Available!")

            let alert = UIAlertView(title: "No Internet Connection", message:"Make sure your device is connected to the internet", delegate: nil, cancelButtonTitle: "OK")

            alert.show()

        }

    }