Verifique la connection a internet con Swift

Cuando trato de verificar si hay una connection a Internet en mi iPhone, recibo un montón de errores. ¿Alguien puede ayudarme a arreglar esto?

El código:

import Foundation import SystemConfiguration public class Reachability { class func isConnectedToNetwork() -> Bool { var zeroAddress = sockaddr_in() zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress)) zeroAddress.sin_family = sa_family_t(AF_INET) let defaultRouteReachability = withUnsafePointer(&zeroAddress) { SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0)) } var flags: SCNetworkReachabilityFlags = 0 if SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) == 0 { return false } let isReachable = (flags & UInt32(kSCNetworkFlagsReachable)) != 0 let needsConnection = (flags & UInt32(kSCNetworkFlagsConnectionRequinetworking)) != 0 return (isReachable && !needsConnection) ? true : false } } 

Los errores con el código:

Errores

Si no se puede leer, el error 1 dice:

'Int' no es convertible a 'SCNetworkReachabilityFlags'

Error 2 y 3:

No se pudo encontrar una sobrecarga para 'init' que acepte los arguments suministrados.

Xcode 8.3 • Swift 3.1

Para resolver el problema de 4G mencionado en los comentarios, he utilizado la implementación de accesibilidad @AshleyMills como reference y he vuelto a escribir Reachability for Swift 3.1:


Archivo Reachability.swift

 import Foundation import SystemConfiguration class Reachability { var hostname: String? var isRunning = false var isReachableOnWWAN: Bool var reachability: SCNetworkReachability? var reachabilityFlags = SCNetworkReachabilityFlags() let reachabilitySerialQueue = DispatchQueue(label: "ReachabilityQueue") init?(hostname: String) throws { guard let reachability = SCNetworkReachabilityCreateWithName(nil, hostname) else { throw Network.Error.failedToCreateWith(hostname) } self.reachability = reachability self.hostname = hostname isReachableOnWWAN = true } init?() throws { var zeroAddress = sockaddr_in() zeroAddress.sin_len = UInt8(MemoryLayout<sockaddr_in>.size) zeroAddress.sin_family = sa_family_t(AF_INET) guard let reachability = withUnsafePointer(to: &zeroAddress, { $0.withMemoryRebound(to: sockaddr.self, capacity: 1) { SCNetworkReachabilityCreateWithAddress(nil, $0) }}) else { throw Network.Error.failedToInitializeWith(zeroAddress) } self.reachability = reachability isReachableOnWWAN = true } var status: Network.Status { return !isConnectedToNetwork ? .unreachable : isReachableViaWiFi ? .wifi : isRunningOnDevice ? .wwan : .unreachable } var isRunningOnDevice: Bool = { #if (arch(i386) || arch(x86_64)) && os(iOS) return false #else return true #endif }() deinit { stop() } } extension Reachability { func start() throws { guard let reachability = reachability, !isRunning else { return } var context = SCNetworkReachabilityContext(version: 0, info: nil, retain: nil, release: nil, copyDescription: nil) context.info = Unmanaged<Reachability>.passUnretained(self).toOpaque() guard SCNetworkReachabilitySetCallback(reachability, callout, &context) else { stop() throw Network.Error.failedToSetCallout } guard SCNetworkReachabilitySetDispatchQueue(reachability, reachabilitySerialQueue) else { stop() throw Network.Error.failedToSetDispatchQueue } reachabilitySerialQueue.async { self.flagsChanged() } isRunning = true } func stop() { defer { isRunning = false } guard let reachability = reachability else { return } SCNetworkReachabilitySetCallback(reachability, nil, nil) SCNetworkReachabilitySetDispatchQueue(reachability, nil) self.reachability = nil } var isConnectedToNetwork: Bool { return isReachable && !isConnectionRequinetworkingAndTransientConnection && !(isRunningOnDevice && isWWAN && !isReachableOnWWAN) } var isReachableViaWiFi: Bool { return isReachable && isRunningOnDevice && !isWWAN } /// Flags that indicate the reachability of a network node name or address, including whether a connection is requinetworking, and whether some user intervention might be requinetworking when establishing a connection. var flags: SCNetworkReachabilityFlags? { guard let reachability = reachability else { return nil } var flags = SCNetworkReachabilityFlags() return withUnsafeMutablePointer(to: &flags) { SCNetworkReachabilityGetFlags(reachability, UnsafeMutablePointer($0)) } ? flags : nil } /// compares the current flags with the previous flags and if changed posts a flagsChanged notification func flagsChanged() { guard let flags = flags, flags != reachabilityFlags else { return } reachabilityFlags = flags NotificationCenter.default.post(name: .flagsChanged, object: self) } /// The specified node name or address can be reached via a transient connection, such as PPP. var transientConnection: Bool { return flags?.contains(.transientConnection) == true } /// The specified node name or address can be reached using the current network configuration. var isReachable: Bool { return flags?.contains(.reachable) == true } /// The specified node name or address can be reached using the current network configuration, but a connection must first be established. If this flag is set, the kSCNetworkReachabilityFlagsConnectionOnTraffic flag, kSCNetworkReachabilityFlagsConnectionOnDemand flag, or kSCNetworkReachabilityFlagsIsWWAN flag is also typically set to indicate the type of connection requinetworking. If the user must manually make the connection, the kSCNetworkReachabilityFlagsInterventionRequinetworking flag is also set. var connectionRequinetworking: Bool { return flags?.contains(.connectionRequinetworking) == true } /// The specified node name or address can be reached using the current network configuration, but a connection must first be established. Any traffic directed to the specified name or address will initiate the connection. var connectionOnTraffic: Bool { return flags?.contains(.connectionOnTraffic) == true } /// The specified node name or address can be reached using the current network configuration, but a connection must first be established. var interventionRequinetworking: Bool { return flags?.contains(.interventionRequinetworking) == true } /// The specified node name or address can be reached using the current network configuration, but a connection must first be established. The connection will be established "On Demand" by the CFSocketStream programming interface (see CFStream Socket Additions for information on this). Other functions will not establish the connection. var connectionOnDemand: Bool { return flags?.contains(.connectionOnDemand) == true } /// The specified node name or address is one that is associated with a network interface on the current system. var isLocalAddress: Bool { return flags?.contains(.isLocalAddress) == true } /// Network traffic to the specified node name or address will not go through a gateway, but is routed directly to one of the interfaces in the system. var isDirect: Bool { return flags?.contains(.isDirect) == true } /// The specified node name or address can be reached via a cellular connection, such as EDGE or GPRS. var isWWAN: Bool { return flags?.contains(.isWWAN) == true } /// The specified node name or address can be reached using the current network configuration, but a connection must first be established. If this flag is set /// The specified node name or address can be reached via a transient connection, such as PPP. var isConnectionRequinetworkingAndTransientConnection: Bool { return (flags?.intersection([.connectionRequinetworking, .transientConnection]) == [.connectionRequinetworking, .transientConnection]) == true } } func callout(reachability: SCNetworkReachability, flags: SCNetworkReachabilityFlags, info: UnsafeMutableRawPointer?) { guard let info = info else { return } DispatchQueue.main.async { Unmanaged<Reachability>.fromOpaque(info).takeUnretainedValue().flagsChanged() } } extension Notification.Name { static let flagsChanged = Notification.Name("FlagsChanged") } struct Network { static var reachability: Reachability? enum Status: String, CustomStringConvertible { case unreachable, wifi, wwan var description: String { return rawValue } } enum Error: Swift.Error { case failedToSetCallout case failedToSetDispatchQueue case failedToCreateWith(String) case failedToInitializeWith(sockaddr_in) } } 

agregue esto al método AppDelegate didFinishLaunchingWithOptions

 do { Network.reachability = try Reachability(hostname: "www.google.com") do { try Network.reachability?.start() } catch let error as Network.Error { print(error) } catch { print(error) } } catch { print(error) } 

Y una muestra del controller de vista:

 import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() NotificationCenter.default.addObserver(self, selector: #selector(statusManager), name: .flagsChanged, object: Network.reachability) updateUserInterface() } func updateUserInterface() { guard let status = Network.reachability?.status else { return } switch status { case .unreachable: view.backgroundColor = .networking case .wifi: view.backgroundColor = .green case .wwan: view.backgroundColor = .yellow } print("Reachability Summary") print("Status:", status) print("HostName:", Network.reachability?.hostname ?? "nil") print("Reachable:", Network.reachability?.isReachable ?? "nil") print("Wifi:", Network.reachability?.isReachableViaWiFi ?? "nil") } func statusManager(_ notification: NSNotification) { updateUserInterface() } } 

Proyecto de muestra

Para Swift 3 Working in cellular and Wi-Fi

 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 == .connectionRequinetworking return isReachable && !needsConnection */ // Working for Cellular and WIFI let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0 let needsConnection = (flags.rawValue & UInt32(kSCNetworkFlagsConnectionRequinetworking)) != 0 let ret = (isReachable && !needsConnection) return ret } } 

Uso:

 if Reachability.isConnectedToNetwork(){ print("Internet Connection Available!") }else{ print("Internet Connection not Available!") } 

Cree un nuevo file Swift dentro de su proyecto, Reachability.swift . Corta y pega el siguiente código para crear tu class.

 import Foundation 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(sizeofValue(zeroAddress)) zeroAddress.sin_family = sa_family_t(AF_INET) let defaultRouteReachability = withUnsafePointer(&zeroAddress) { SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, UnsafePointer($0)) } var flags: SCNetworkReachabilityFlags = SCNetworkReachabilityFlags(rawValue: 0) if SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) == false { return false } let isReachable = flags == .Reachable let needsConnection = flags == .ConnectionRequinetworking return isReachable && !needsConnection } } 

Puede consultar la connection a Internet en cualquier lugar de su proyecto usando este código:

 if Reachability.isConnectedToNetwork() == true { println("Internet connection OK") } else { println("Internet connection FAILED") } 

Si el usuario no está conectado a Internet, es posible que desee mostrarles un cuadro de dialog de alerta para notificarlos.

 if Reachability.isConnectedToNetwork() == true { println("Internet connection OK") } else { println("Internet connection FAILED") var alert = UIAlertView(title: "No Internet Connection", message: "Make sure your device is connected to the internet.", delegate: nil, cancelButtonTitle: "OK") alert.show() } 

Explicación:

Estamos haciendo una class pública reutilizable y un método que puede usarse en cualquier parte del proyecto para verificar la conectividad a Internet. Necesitamos agregar frameworks de configuration de Foundation y System.

En la capacidad de scope de la class pública, el método isConnectedToNetwork() -> Bool { } devolverá un valor bool sobre la conectividad a Internet. Usamos un bucle if para realizar acciones requeridas en el caso. Espero que esto sea suficiente ¡Aclamaciones!

He revisado la implementación de la class de Alcance de Ashley Mill sin Cocoa Pods / Dependancy Manager. La idea es hacer que la dependencia de Reachability sea gratuita en el proyecto.

Xcode 7.2 – Swift 2.1

1) https://github.com/ashleymills/Reachability.swift . Descargar agregue la class Reachability al proyecto.

Nota: mientras agrega, asegúrese de que 'Copiar elementos, si es necesario' está marcado.

2) Haz una class de AppManager.swift. Esta class se atenderá como class de model público donde se agregarán methods y datos públicos y se pueden utilizar en cualquier VC.

 // AppManager.swift import UIKit import Foundation class AppManager: NSObject{ var delegate:AppManagerDelegate? = nil private var _useClosures:Bool = false private var reachability: Reachability? private var _isReachability:Bool = false private var _reachabiltyNetworkType :String? var isReachability:Bool { get {return _isReachability} } var reachabiltyNetworkType:String { get {return _reachabiltyNetworkType! } } // Create a shanetworking instance of AppManager final class var shanetworkingInstance : AppManager { struct Static { static var instance : AppManager? } if !(Static.instance != nil) { Static.instance = AppManager() } return Static.instance! } // Reachability Methods func initRechabilityMonitor() { print("initialize rechability...") do { let reachability = try Reachability.reachabilityForInternetConnection() self.reachability = reachability } catch ReachabilityError.FailedToCreateWithAddress(let address) { print("Unable to create\nReachability with address:\n\(address)") return } catch {} if (_useClosures) { reachability?.whenReachable = { reachability in self.notifyReachability(reachability) } reachability?.whenUnreachable = { reachability in self.notifyReachability(reachability) } } else { self.notifyReachability(reachability!) } do { try reachability?.startNotifier() } catch { print("unable to start notifier") return } } private func notifyReachability(reachability:Reachability) { if reachability.isReachable() { self._isReachability = true //Determine Network Type if reachability.isReachableViaWiFi() { self._reachabiltyNetworkType = CONNECTION_NETWORK_TYPE.WIFI_NETWORK.rawValue } else { self._reachabiltyNetworkType = CONNECTION_NETWORK_TYPE.WWAN_NETWORK.rawValue } } else { self._isReachability = false self._reachabiltyNetworkType = CONNECTION_NETWORK_TYPE.OTHER.rawValue } NSNotificationCenter.defaultCenter().addObserver(self, selector: "reachabilityChanged:", name: ReachabilityChangedNotification, object: reachability) } func reachabilityChanged(note: NSNotification) { let reachability = note.object as! Reachability dispatch_async(dispatch_get_main_queue()) { if (self._useClosures) { self.reachability?.whenReachable = { reachability in self.notifyReachability(reachability) } self.reachability?.whenUnreachable = { reachability in self.notifyReachability(reachability) } } else { self.notifyReachability(reachability) } self.delegate?.reachabilityStatusChangeHandler(reachability) } } deinit { reachability?.stopNotifier() if (!_useClosures) { NSNotificationCenter.defaultCenter().removeObserver(self, name: ReachabilityChangedNotification, object: nil) } } } 

3) Haz una class de delegado. Uso el método delegado para notificar el estado de conectividad.

 // Protocols.swift import Foundation @objc protocol AppManagerDelegate:NSObjectProtocol { func reachabilityStatusChangeHandler(reachability:Reachability) } 

4) Realice la class principal de UIViewController (método de inheritance). La class padre tiene methods que son accesibles para todos los VC secundarios.

 // UIappViewController.swift import UIKit class UIappViewController: UIViewController,AppManagerDelegate { var manager:AppManager = AppManager.shanetworkingInstance override func viewDidLoad() { super.viewDidLoad() manager.delegate = self } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() } func reachabilityStatusChangeHandler(reachability: Reachability) { if reachability.isReachable() { print("isReachable") } else { print("notReachable") } } } 

5) Iniciar monitoreo de conectividad a Internet en time real en AppDelegate.

 func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { AppManager.shanetworkingInstance.initRechabilityMonitor() return true } 

6) He agregado una reference de aplicación de nombre de file Swift para almacenar valores de enumeración constante.

 // AppReference.swift import Foundation enum CONNECTION_NETWORK_TYPE : String { case WIFI_NETWORK = "Wifi" case WWAN_NETWORK = "Cellular" case OTHER = "Other" } 

7) En ViewController (por ejemplo, desea llamar a una API solo si la networking está disponible)

 // ViewController.swift import UIKit class ViewController: UIappViewController { var reachability:Reachability? override func viewDidLoad() { super.viewDidLoad() manager.delegate = self if(AppManager.shanetworkingInstance.isReachability) { print("net available") //call API from here. } else { dispatch_async(dispatch_get_main_queue()) { print("net not available") //Show Alert } } //Determine Network Type if(AppManager.shanetworkingInstance.reachabiltyNetworkType == "Wifi") { print(".Wifi") } else if (AppManager.shanetworkingInstance.reachabiltyNetworkType == "Cellular") { print(".Cellular") } else { dispatch_async(dispatch_get_main_queue()) { print("Network not reachable") } } } override func viewWillAppear(animated: Bool) { } override func didReceiveMemoryWarning() { } } 

La muestra se puede download en https://github.com/alvinreuben/Reachability-Sample

Actualizado a Swift 3.1- https://github.com/alvinvgeorge/Reachability-UpgradedToSwift3

Solo me di count de esto.

Xcode: 7.3.1, iOS 9.3.3

Al usar ashleymills / Reachability.swift como Reachability.swift en mi proyecto, creé la siguiente function:

 func hasConnectivity() -> Bool { do { let reachability: Reachability = try Reachability.reachabilityForInternetConnection() let networkStatus: Int = reachability.currentReachabilityStatus.hashValue return (networkStatus != 0) } catch { // Handle error however you please return false } } 

Simplemente llame a hasConnectivity() donde quiera que necesite verificar una connection. Esto funciona tanto para Wi-Fi como para celular.


Agregando Reachability.swift de ashleymills para que las personas no tengan que moverse entre sitios:

 Copyright (c) 2014, Ashley Mills All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ // Reachability.swift version 2.2beta2 import SystemConfiguration import Foundation public enum ReachabilityError: ErrorType { case FailedToCreateWithAddress(sockaddr_in) case FailedToCreateWithHostname(String) case UnableToSetCallback case UnableToSetDispatchQueue } public let ReachabilityChangedNotification = "ReachabilityChangedNotification" func callback(reachability:SCNetworkReachability, flags: SCNetworkReachabilityFlags, info: UnsafeMutablePointer<Void>) { let reachability = Unmanaged<Reachability>.fromOpaque(COpaquePointer(info)).takeUnretainedValue() dispatch_async(dispatch_get_main_queue()) { reachability.reachabilityChanged(flags) } } public class Reachability: NSObject { public typealias NetworkReachable = (Reachability) -> () public typealias NetworkUnreachable = (Reachability) -> () public enum NetworkStatus: CustomStringConvertible { case NotReachable, ReachableViaWiFi, ReachableViaWWAN public var description: String { switch self { case .ReachableViaWWAN: return "Cellular" case .ReachableViaWiFi: return "WiFi" case .NotReachable: return "No Connection" } } } // MARK: - *** Public properties *** public var whenReachable: NetworkReachable? public var whenUnreachable: NetworkUnreachable? public var reachableOnWWAN: Bool public var notificationCenter = NSNotificationCenter.defaultCenter() public var currentReachabilityStatus: NetworkStatus { if isReachable() { if isReachableViaWiFi() { return .ReachableViaWiFi } if isRunningOnDevice { return .ReachableViaWWAN } } return .NotReachable } public var currentReachabilityString: String { return "\(currentReachabilityStatus)" } private var previousFlags: SCNetworkReachabilityFlags? // MARK: - *** Initialisation methods *** requinetworking public init(reachabilityRef: SCNetworkReachability) { reachableOnWWAN = true self.reachabilityRef = reachabilityRef } public convenience init(hostname: String) throws { let nodename = (hostname as NSString).UTF8String guard let ref = SCNetworkReachabilityCreateWithName(nil, nodename) else { throw ReachabilityError.FailedToCreateWithHostname(hostname) } self.init(reachabilityRef: ref) } public class func reachabilityForInternetConnection() throws -> Reachability { var zeroAddress = sockaddr_in() zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress)) zeroAddress.sin_family = sa_family_t(AF_INET) guard let ref = withUnsafePointer(&zeroAddress, { SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0)) }) else { throw ReachabilityError.FailedToCreateWithAddress(zeroAddress) } return Reachability(reachabilityRef: ref) } public class func reachabilityForLocalWiFi() throws -> Reachability { var localWifiAddress: sockaddr_in = sockaddr_in(sin_len: __uint8_t(0), sin_family: sa_family_t(0), sin_port: in_port_t(0), sin_addr: in_addr(s_addr: 0), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0)) localWifiAddress.sin_len = UInt8(sizeofValue(localWifiAddress)) localWifiAddress.sin_family = sa_family_t(AF_INET) // IN_LINKLOCALNETNUM is defined in <netinet/in.h> as 169.254.0.0 let address: UInt32 = 0xA9FE0000 localWifiAddress.sin_addr.s_addr = in_addr_t(address.bigEndian) guard let ref = withUnsafePointer(&localWifiAddress, { SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0)) }) else { throw ReachabilityError.FailedToCreateWithAddress(localWifiAddress) } return Reachability(reachabilityRef: ref) } // MARK: - *** Notifier methods *** public func startNotifier() throws { guard !notifierRunning else { return } var context = SCNetworkReachabilityContext(version: 0, info: nil, retain: nil, release: nil, copyDescription: nil) context.info = UnsafeMutablePointer(Unmanaged.passUnretained(self).toOpaque()) if !SCNetworkReachabilitySetCallback(reachabilityRef!, callback, &context) { stopNotifier() throw ReachabilityError.UnableToSetCallback } if !SCNetworkReachabilitySetDispatchQueue(reachabilityRef!, reachabilitySerialQueue) { stopNotifier() throw ReachabilityError.UnableToSetDispatchQueue } // Perform an intial check dispatch_async(reachabilitySerialQueue) { () -> Void in let flags = self.reachabilityFlags self.reachabilityChanged(flags) } notifierRunning = true } public func stopNotifier() { defer { notifierRunning = false } guard let reachabilityRef = reachabilityRef else { return } SCNetworkReachabilitySetCallback(reachabilityRef, nil, nil) SCNetworkReachabilitySetDispatchQueue(reachabilityRef, nil) } // MARK: - *** Connection test methods *** public func isReachable() -> Bool { let flags = reachabilityFlags return isReachableWithFlags(flags) } public func isReachableViaWWAN() -> Bool { let flags = reachabilityFlags // Check we're not on the simulator, we're REACHABLE and check we're on WWAN return isRunningOnDevice && isReachable(flags) && isOnWWAN(flags) } public func isReachableViaWiFi() -> Bool { let flags = reachabilityFlags // Check we're reachable if !isReachable(flags) { return false } // Must be on WiFi if reachable but not on an iOS device (ie simulator) if !isRunningOnDevice { return true } // Check we're NOT on WWAN return !isOnWWAN(flags) } // MARK: - *** Private methods *** private var isRunningOnDevice: Bool = { #if (arch(i386) || arch(x86_64)) && os(iOS) return false #else return true #endif }() private var notifierRunning = false private var reachabilityRef: SCNetworkReachability? private let reachabilitySerialQueue = dispatch_queue_create("uk.co.ashleymills.reachability", DISPATCH_QUEUE_SERIAL) private func reachabilityChanged(flags: SCNetworkReachabilityFlags) { guard previousFlags != flags else { return } if isReachableWithFlags(flags) { if let block = whenReachable { block(self) } } else { if let block = whenUnreachable { block(self) } } notificationCenter.postNotificationName(ReachabilityChangedNotification, object:self) previousFlags = flags } private func isReachableWithFlags(flags: SCNetworkReachabilityFlags) -> Bool { if !isReachable(flags) { return false } if isConnectionRequinetworkingOrTransient(flags) { return false } if isRunningOnDevice { if isOnWWAN(flags) && !reachableOnWWAN { // We don't want to connect when on 3G. return false } } return true } // WWAN may be available, but not active until a connection has been established. // WiFi may require a connection for VPN on Demand. private func isConnectionRequinetworking() -> Bool { return connectionRequinetworking() } private func connectionRequinetworking() -> Bool { let flags = reachabilityFlags return isConnectionRequinetworking(flags) } // Dynamic, on demand connection? private func isConnectionOnDemand() -> Bool { let flags = reachabilityFlags return isConnectionRequinetworking(flags) && isConnectionOnTrafficOrDemand(flags) } // Is user intervention requinetworking? private func isInterventionRequinetworking() -> Bool { let flags = reachabilityFlags return isConnectionRequinetworking(flags) && isInterventionRequinetworking(flags) } private func isOnWWAN(flags: SCNetworkReachabilityFlags) -> Bool { #if os(iOS) return flags.contains(.IsWWAN) #else return false #endif } private func isReachable(flags: SCNetworkReachabilityFlags) -> Bool { return flags.contains(.Reachable) } private func isConnectionRequinetworking(flags: SCNetworkReachabilityFlags) -> Bool { return flags.contains(.ConnectionRequinetworking) } private func isInterventionRequinetworking(flags: SCNetworkReachabilityFlags) -> Bool { return flags.contains(.InterventionRequinetworking) } private func isConnectionOnTraffic(flags: SCNetworkReachabilityFlags) -> Bool { return flags.contains(.ConnectionOnTraffic) } private func isConnectionOnDemand(flags: SCNetworkReachabilityFlags) -> Bool { return flags.contains(.ConnectionOnDemand) } func isConnectionOnTrafficOrDemand(flags: SCNetworkReachabilityFlags) -> Bool { return !flags.intersect([.ConnectionOnTraffic, .ConnectionOnDemand]).isEmpty } private func isTransientConnection(flags: SCNetworkReachabilityFlags) -> Bool { return flags.contains(.TransientConnection) } private func isLocalAddress(flags: SCNetworkReachabilityFlags) -> Bool { return flags.contains(.IsLocalAddress) } private func isDirect(flags: SCNetworkReachabilityFlags) -> Bool { return flags.contains(.IsDirect) } private func isConnectionRequinetworkingOrTransient(flags: SCNetworkReachabilityFlags) -> Bool { let testcase:SCNetworkReachabilityFlags = [.ConnectionRequinetworking, .TransientConnection] return flags.intersect(testcase) == testcase } private var reachabilityFlags: SCNetworkReachabilityFlags { guard let reachabilityRef = reachabilityRef else { return SCNetworkReachabilityFlags() } var flags = SCNetworkReachabilityFlags() let gotFlags = withUnsafeMutablePointer(&flags) { SCNetworkReachabilityGetFlags(reachabilityRef, UnsafeMutablePointer($0)) } if gotFlags { return flags } else { return SCNetworkReachabilityFlags() } } override public var description: String { var W: String if isRunningOnDevice { W = isOnWWAN(reachabilityFlags) ? "W" : "-" } else { W = "X" } let R = isReachable(reachabilityFlags) ? "R" : "-" let c = isConnectionRequinetworking(reachabilityFlags) ? "c" : "-" let t = isTransientConnection(reachabilityFlags) ? "t" : "-" let i = isInterventionRequinetworking(reachabilityFlags) ? "i" : "-" let C = isConnectionOnTraffic(reachabilityFlags) ? "C" : "-" let D = isConnectionOnDemand(reachabilityFlags) ? "D" : "-" let l = isLocalAddress(reachabilityFlags) ? "l" : "-" let d = isDirect(reachabilityFlags) ? "d" : "-" return "\(W)\(R) \(c)\(t)\(i)\(C)\(D)\(l)\(d)" } deinit { stopNotifier() reachabilityRef = nil whenReachable = nil whenUnreachable = nil } } 

I have made my own solution using NSTimer and Alamofire:

 import Alamofire public class ConnectionHelper: NSObject { var request: Alamofire.Request? func isInternetConnected(completionHandler: Bool -> Void) { NSTimer.scheduledTimerWithTimeInterval(5.0, target: self, selector: "requestTimeout", userInfo: nil, repeats: false) request = Alamofire .request( Method.HEAD, "http://www.testurl.com" ) .response { response in if response.3?.code == -999 { completionHandler( false ) } else { completionHandler( true ) } } } func requestTimeout() { request!.cancel() } } 

The NSTimer is used as a timeout, and was used due to unreliable results using the Alamofire timeout. The request should be made to a URL you trust to be reliable, such as your own server or the server that is hosting the services you depend on.

When the timer expires, the request is cancelled and the results are returned using a completion handler.

Uso:

 ConnectionHelper().isInternetConnected() { internetConnected in if internetConnected { // Connected } else { // Not connected } } 

If you are using Alamofire, you can do something like this:

 let configuration = NSURLSessionConfiguration.defaultSessionConfiguration() configuration.timeoutIntervalForRequest = 15 //Set timeouts in sec configuration.timeoutIntervalForResource = 15 let alamoFireManager = Alamofire.Manager(configuration:configuration) alamoFireManager?.request(.GET, "https://yourURL.com", parameters: headers, encoding: .URL) .validate() .responseJSON { response in if let error = response.result.error { switch error.code{ case -1001: print("Slow connection") return case -1009: print("No Connection!") return default: break } } 

here my solution for swift 2.3 with the lib ( Reachability.swift )

Go into your Podfile and add :

 pod 'ReachabilitySwift', '~> 2.4' // swift 2.3 

Then into your terminal :

 pod install 

Then create a new file ReachabilityManager and add code below :

 import Foundation import ReachabilitySwift enum ReachabilityManagerType { case Wifi case Cellular case None } class ReachabilityManager { static let shanetworkingInstance = ReachabilityManager() private var reachability: Reachability! private var reachabilityManagerType: ReachabilityManagerType = .None private init() { do { self.reachability = try Reachability.reachabilityForInternetConnection() } catch { print("Unable to create Reachability") return } NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(ReachabilityManager.reachabilityChanged(_:)),name: ReachabilityChangedNotification,object: self.reachability) do{ try self.reachability.startNotifier() }catch{ print("could not start reachability notifier") } } @objc private func reachabilityChanged(note: NSNotification) { let reachability = note.object as! Reachability if reachability.isReachable() { if reachability.isReachableViaWiFi() { self.reachabilityManagerType = .Wifi } else { self.reachabilityManagerType = .Cellular } } else { self.reachabilityManagerType = .None } } } extension ReachabilityManager { func isConnectedToNetwork() -> Bool { return reachabilityManagerType != .None } } 

How use it:

go into your AppDelegate.swift and add the code below :

 func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { ReachabilityManager.shanetworkingInstance } 

Then when you want to check if the device is connected to internet do :

 if ReachabilityManager.shanetworkingInstance.isConnectedToNetwork() { // Connected } else { // Not connected } 

With the help of below code you can check for internet Connection for both cellular network as well as for wifi. language – Swift 3.0

 import UIKit import Foundation import SystemConfiguration class NetworkConnection: UIViewController { 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) guard let defaultRouteReachability = withUnsafePointer(to: &zeroAddress, { $0.withMemoryRebound(to: sockaddr.self, capacity: 1) { SCNetworkReachabilityCreateWithAddress(nil, $0) } }) else { return false } var flags: SCNetworkReachabilityFlags = SCNetworkReachabilityFlags(rawValue: 0) if SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) == false { return false } let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0 let needsConnection = (flags.rawValue & UInt32(kSCNetworkFlagsConnectionRequinetworking)) != 0 return (isReachable && !needsConnection) } class func checkConnection(sender:UIViewController){ if NetworkConnection.isConnectedToNetwork() == true { print("Connected to the internet") // Do something } else { print("No internet connection") let alertController = UIAlertController(title: "No Internet Available", message: "", prefernetworkingStyle: UIAlertControllerStyle.alert) let okAction = UIAlertAction(title: "Ok", style: UIAlertActionStyle.default){(result:UIAlertAction) -> Void in return } alertController.addAction(okAction) sender.present(alertController, animated: true, completion: nil) // Do something } } } 

For swift 3, I couldn't use just reachability from RAJAMOHAN-S solutions since it returns "true" if there is WiFi but no Internet. Thus, I implemented second validation via URLSession class and completion handler.

Here is the whole class.

 import Foundation 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 } // Working for Cellular and WIFI let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0 let needsConnection = (flags.rawValue & UInt32(kSCNetworkFlagsConnectionRequinetworking)) != 0 let ret = (isReachable && !needsConnection) return ret } class func isInternetAvailable(webSiteToPing: String?, completionHandler: @escaping (Bool) -> Void) { // 1. Check the WiFi Connection guard isConnectedToNetwork() else { completionHandler(false) return } // 2. Check the Internet Connection var webAddress = "https://www.google.com" // Default Web Site if let _ = webSiteToPing { webAddress = webSiteToPing! } guard let url = URL(string: webAddress) else { completionHandler(false) print("could not create url from: \(webAddress)") return } let urlRequest = URLRequest(url: url) let session = URLSession.shanetworking let task = session.dataTask(with: urlRequest, completionHandler: { (data, response, error) in if error != nil || response == nil { completionHandler(false) } else { completionHandler(true) } }) task.resume() } } 

And you call this like this, for example:

 Reachability.isInternetAvailable(webSiteToPing: nil) { (isInternetAvailable) in guard isInternetAvailable else { // Inform user for example return } // Do some action if there is Internet } 

If someone is already using Alamofire then –

 struct Connectivity { static let shanetworkingInstance = NetworkReachabilityManager()! static var isConnectedToInternet:Bool { return self.shanetworkingInstance.isReachable } 

}

Uso:

  if Connectivity.isConnectedToInternet { print("Connected") } else{ print("No Internet") }