How to check internet connection in alamofire?

For swift 3.1 and Alamofire 4.4 ,I created a swift class called Connectivity . Use NetworkReachabilityManager class from Alamofire and configure the isConnectedToInternet() method as per your need.

import Foundationimport Alamofireclass Connectivity {    class func isConnectedToInternet() -> Bool {        return NetworkReachabilityManager()?.isReachable ?? false    }}

Usage:

if Connectivity.isConnectedToInternet() {        print("Yes! internet is available.")        // do some tasks.. }

EDIT:Since swift is encouraging computed properties, you can change the above function like:

import Foundationimport Alamofireclass Connectivity {    class var isConnectedToInternet:Bool {        return NetworkReachabilityManager()?.isReachable ?? false    }}

and use it like:

if Connectivity.isConnectedToInternet {        print("Yes! internet is available.")        // do some tasks.. }

Swift 2.3

Alamofire.request(.POST, url).responseJSON { response inswitch response.result {    case .Success(let json):        // internet works.      case .Failure(let error):        if let err = error as? NSURLError where err == .NotConnectedToInternet {            // no internet connection        } else {            // other failures        }    }}

Swift 3.0

  Alamofire.upload(multipartFormData: { multipartFormData in    }, to: URL, method: .post,headers: nil,       encodingCompletion:  { (result) in        switch result {        case .success( _, _, _): break        case .failure(let encodingError ):            print(encodingError)            if let err = encodingError as? URLError, err.code == .notConnectedToInternet {                // no internet connection                print(err)            } else {                // other failures            }        }    })

Using NetworkReachabilityManager

let networkReachabilityManager = Alamofire.NetworkReachabilityManager(host: "www.apple.com")func checkForReachability() {    self.networkReachabilityManager?.listener = { status in        print("Network Status: \(status)")        switch status {        case .notReachable:            //Show error here (no internet connection)        case .reachable(_), .unknown:            //Hide error here        }    }    self.networkReachabilityManager?.startListening()}//How to Use : Just call below function in required classif checkForReachability() {   print("connected with network")}

For Swift 3/4,

In Alamofire, there is a class called NetworkReachabilityManager which can be used to observer or check if internet is available or not.

let reachabilityManager = NetworkReachabilityManager()reachabilityManager?.startListening()reachabilityManager?.listener = { _ in        if let isNetworkReachable = self.reachabilityManager?.isReachable,            isNetworkReachable == true {            //Internet Available        } else {            //Internet Not Available"        }    }

Here, listener will get called every time when there is changes in state of internet. You can handle it as you would like.