Überprüfen Sie die Internetverbindung mit Swift

Wenn ich versuche, auf meinem iPhone nach einer Internetverbindung zu suchen, werden einige Fehler angezeigt. Kann mir jemand helfen, das zu beheben?

Der Code:

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(kSCNetworkFlagsConnectionRequired)) != 0

    return (isReachable && !needsConnection) ? true : false
}

}

Die Fehler mit dem Code:

Wenn es nicht lesbar ist, lautet Fehler 1:

'Int' kann nicht in 'SCNetworkReachabilityFlags' konvertiert werden.

Fehler 2 & 3:

Es wurde keine Überladung für 'init' gefunden, die die angegebenen Argumente akzeptiert

Um das in den Kommentaren erwähnte 4G-Problem zu lösen, habe ich die Erreichbarkeitsimplementierung von @AshleyMills als Referenz verwendet und die Erreichbarkeit für Swift 3.1 neu geschrieben:

aktualisiert: Xcode 10.1 • Swift 4 oder höher

Reachability.swift-Datei

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
        try start()
    }
    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
        try start()
    }
    var status: Network.Status {
        return  !isConnectedToNetwork ? .unreachable :
                isReachableViaWiFi    ? .wifi :
                isRunningOnDevice     ? .wwan : .unreachable
    }
    var isRunningOnDevice: Bool = {
        #if targetEnvironment(simulator)
            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 &&
               !isConnectionRequiredAndTransientConnection &&
               !(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 required, and whether some user intervention might be required 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 required. If the user must manually make the connection, the kSCNetworkReachabilityFlagsInterventionRequired flag is also set.
    var connectionRequired: Bool { return flags?.contains(.connectionRequired) == 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 interventionRequired: Bool { return flags?.contains(.interventionRequired) == 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 isConnectionRequiredAndTransientConnection: Bool {
        return (flags?.intersection([.connectionRequired, .transientConnection]) == [.connectionRequired, .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 {
        case unreachable, wifi, wwan
    }
    enum Error: Swift.Error {
        case failedToSetCallout
        case failedToSetDispatchQueue
        case failedToCreateWith(String)
        case failedToInitializeWith(sockaddr_in)
    }
}

Verwendung

Initialisieren Sie es in Ihrer didDinegate.swift didFinishLaunchingWithOptions-Methode und behandeln Sie alle Fehler, die auftreten können:

import UIKit
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        do {
            try Network.reachability = Reachability(hostname: "www.google.com")
        }
        catch {
            switch error as? Network.Error {
            case let .failedToCreateWith(hostname)?:
                print("Network error:\nFailed to create reachability object With host named:", hostname)
            case let .failedToInitializeWith(address)?:
                print("Network error:\nFailed to initialize reachability object With address:", address)
            case .failedToSetCallout?:
                print("Network error:\nFailed to set callout")
            case .failedToSetDispatchQueue?:
                print("Network error:\nFailed to set DispatchQueue")
            case .none:
                print(error)
            }
        }
        return true
    }
}

Und ein View Controller-Beispiel:

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

Beispielprojekt

Für Swift 3, Swift 4 (Arbeiten mit Mobilfunk und 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 == .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

    }
}

Verwendung:

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

Erstellen Sie eine neue Swift-Datei in Ihrem Projekt und benennen Sie sie Reachability.swift. Schneiden Sie den folgenden Code aus und fügen Sie ihn ein, um Ihre Klasse zu erstellen.

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 == .ConnectionRequired

        return isReachable && !needsConnection

    }
}

Mit diesem Code können Sie die Internetverbindung an einer beliebigen Stelle in Ihrem Projekt überprüfen:

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

Wenn der Benutzer nicht mit dem Internet verbunden ist, möchten Sie ihm möglicherweise einen Warndialog anzeigen, um ihn zu benachrichtigen.

if Reachability.isConnectedToNetwork() {
    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()
}

Erläuterung:

Wir machen eine wiederverwendbare öffentliche Klasse und eine Methode, die überall im Projekt verwendet werden kann, um die Internetverbindung zu überprüfen. Wir müssen Foundation- und Systemkonfigurations-Frameworks hinzufügen.

In der öffentlichen Klasse Reachability gibt die Methode isConnectedToNetwork() -> Bool { }einen Bool-Wert für die Internetverbindung zurück. Wir verwenden eine if-Schleife, um die erforderlichen Aktionen für den Fall auszuführen. Ich hoffe das reicht. Prost!

Wenn jemand Alamofire bereits verwendet, dann -

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

Verwendung:

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

Ich habe die Implementierung der Erreichbarkeitsklasse von Ashley Mill ohne Cocoa Pods / Dependancy Manager überprüft. Die Idee ist, die Erreichbarkeitsabhängigkeit im Projekt frei zu machen.

Xcode 7.2 - Swift 2.1

1) https://github.com/ashleymills/Reachability.swift . Download Fügen Sie dem Projekt die Erreichbarkeitsklasse hinzu.

Hinweis: Stellen Sie beim Hinzufügen sicher, dass "Elemente bei Bedarf kopieren" aktiviert ist.

2) Erstellen Sie eine AppManager.swift-Klasse. Diese Klasse wird als öffentliche Modellklasse angeboten, in der öffentliche Methoden und Daten hinzugefügt werden und in jedem VC verwendet werden können.

//  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 shared instance of AppManager
    final  class var sharedInstance : 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) Machen Sie eine Delegiertenklasse. Ich verwende die Delegate-Methode, um den Konnektivitätsstatus zu benachrichtigen.

//  Protocols.swift

import Foundation
@objc protocol AppManagerDelegate:NSObjectProtocol {

    func reachabilityStatusChangeHandler(reachability:Reachability)
}

4) Machen Sie die übergeordnete Klasse von UIViewController (Vererbungsmethode). Die übergeordnete Klasse verfügt über Methoden, auf die alle untergeordneten VCs zugreifen können.

//  UIappViewController.swift

    import UIKit

    class UIappViewController: UIViewController,AppManagerDelegate {
        var manager:AppManager = AppManager.sharedInstance

        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) Starten Sie die Echtzeit-Überwachung der Internetverbindung in AppDelegate.

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

6) Ich habe eine Swift File Name AppReference hinzugefügt, um konstante Aufzählungswerte zu speichern.

//  AppReference.swift

import Foundation

enum CONNECTION_NETWORK_TYPE : String {

  case WIFI_NETWORK = "Wifi"
  case WWAN_NETWORK = "Cellular"
  case OTHER = "Other"

}

7) Auf ViewController (z. B. Sie möchten eine API nur aufrufen, wenn ein Netzwerk verfügbar ist).

//  ViewController.swift

        import UIKit

class ViewController: UIappViewController {
  var reachability:Reachability?

  override func viewDidLoad() {
    super.viewDidLoad()
    manager.delegate = self

    if(AppManager.sharedInstance.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.sharedInstance.reachabiltyNetworkType == "Wifi")
    {
      print(".Wifi")
    }
    else if (AppManager.sharedInstance.reachabiltyNetworkType == "Cellular")
    {
      print(".Cellular")
    }
    else {
      dispatch_async(dispatch_get_main_queue()) {
        print("Network not reachable")
      }
    }

  }
  override func viewWillAppear(animated: Bool) {
  }
  override func didReceiveMemoryWarning() {
  }
}

Das Beispiel kann heruntergeladen werden @ https://github.com/alvinreuben/Reachability-Sample

Upgrade auf Swift 3.1- https://github.com/alvinvgeorge/Reachability-UpgradedToSwift3

Apple hat Network Framework in iOS12 eingeführt.

import Foundation
import Network

class NetworkReachability {

   var pathMonitor: NWPathMonitor!
   var path: NWPath?
   lazy var pathUpdateHandler: ((NWPath) -> Void) = { path in
    self.path = path
    if path.status == NWPath.Status.satisfied {
        print("Connected")
    } else if path.status == NWPath.Status.unsatisfied {
        print("unsatisfied")
    } else if path.status == NWPath.Status.requiresConnection {
        print("requiresConnection")
    } 
}

let backgroudQueue = DispatchQueue.global(qos: .background)

init() {
    pathMonitor = NWPathMonitor()
    pathMonitor.pathUpdateHandler = self.pathUpdateHandler
    pathMonitor.start(queue: backgroudQueue)
   } 

 func isNetworkAvailable() -> Bool {
        if let path = self.path {
           if path.status == NWPath.Status.satisfied {
            return true
          }
        }
       return false
   }
 }

Verwenden Sie dies für Swift-5 +

import Foundation
import UIKit
import SystemConfiguration

public class InternetConnectionManager {


    private init() {

    }

    public static func isConnectedToNetwork() -> Bool {

        var zeroAddress = sockaddr_in()
        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()
        if !SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) {
            return false
        }
        let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0
        let needsConnection = (flags.rawValue & UInt32(kSCNetworkFlagsConnectionRequired)) != 0
        return (isReachable && !needsConnection)
    }

}

Verwendung:

InternetConnectionManager.isConnectedToNetwork{
    print("Connected")
}else{
    print("Not Connected")
}

Oder verwenden Sie dies einfach frameworkfür mehrUtilities : Link

Hab das nur für mich selbst herausgefunden.

Xcode: 7.3.1, iOS 9.3.3

Mit ashleymills / Reachability.swift als Reachability.swift in meinem Projekt habe ich die folgende Funktion erstellt:

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
    }
}

Rufen hasConnectivity()Sie einfach an, wo immer Sie nach einer Verbindung suchen müssen. Dies funktioniert sowohl für Wifi als auch für Cellular.

Hinzufügen von Reachability.swift von ashleymills, damit die Benutzer nicht zwischen Standorten wechseln müssen:

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 ***

    required 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 (i.e. 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 isConnectionRequiredOrTransient(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 isConnectionRequired() -> Bool {
        return connectionRequired()
    }

    private func connectionRequired() -> Bool {
        let flags = reachabilityFlags
        return isConnectionRequired(flags)
    }

    // Dynamic, on demand connection?
    private func isConnectionOnDemand() -> Bool {
        let flags = reachabilityFlags
        return isConnectionRequired(flags) && isConnectionOnTrafficOrDemand(flags)
    }

    // Is user intervention required?
    private func isInterventionRequired() -> Bool {
        let flags = reachabilityFlags
        return isConnectionRequired(flags) && isInterventionRequired(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 isConnectionRequired(flags: SCNetworkReachabilityFlags) -> Bool {
        return flags.contains(.ConnectionRequired)
    }
    private func isInterventionRequired(flags: SCNetworkReachabilityFlags) -> Bool {
        return flags.contains(.InterventionRequired)
    }
    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 isConnectionRequiredOrTransient(flags: SCNetworkReachabilityFlags) -> Bool {
        let testcase:SCNetworkReachabilityFlags = [.ConnectionRequired, .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 = isConnectionRequired(reachabilityFlags) ? "c" : "-"
        let t = isTransientConnection(reachabilityFlags) ? "t" : "-"
        let i = isInterventionRequired(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
    }
}

Obwohl es Ihre Frage nicht direkt beantwortet, möchte ich erwähnen, dass Apple kürzlich diesen Vortrag gehalten hat:

https://developer.apple.com/videos/play/wwdc2018/714/

Gegen 09:55 Uhr spricht er darüber, wie man das macht, worüber man fragt:

1. Verbindung prüfen
2. Wenn Verbindung -> etwas tun
3. Wenn keine Verbindung besteht -> etwas anderes tun (warten? Wiederholen?)

Dies hat jedoch einige Fallstricke:

• Was ist, wenn in Schritt 2 angegeben wird, dass eine Verbindung besteht, 0,5 Sekunden später jedoch keine?
• Was ist, wenn sich der Benutzer hinter einem Proxy befindet?
• Was ist, wenn einige Antworten hier die Konnektivität nicht richtig bestimmen können? (Ich bin sicher, wenn Sie Ihre Verbindung schnell wechseln, zu Wi-Fi gehen und sie ausschalten (machen Sie es einfach kompliziert), kann es fast nie richtig feststellen, ob ich eine Verbindung habe oder nicht).
• Zitat aus dem Video: "Es gibt keine Möglichkeit zu garantieren, ob eine zukünftige Operation erfolgreich sein wird oder nicht"

Die folgenden Punkte sind laut Apple einige bewährte Methoden:

• eingestellt waitsForConnectivityauf wahr ( https://developer.apple.com/documentation/foundation/urlsessionconfiguration/2908812-waitsforconnectivity )
• Antworten Sie auf die Delegate-Methode taskIsWaitingForConnectivity( https://developer.apple.com/documentation/foundation/urlsessiontaskdelegate/2908819-urlsession ). Dies ist die von Apple empfohlene Methode, um die Konnektivität zu überprüfen, wie im Video um 33:25 Uhr erwähnt.

Laut dem Vortrag sollte es keinen Grund geben, vorab zu prüfen, ob Sie eine Internetverbindung haben oder nicht, da diese zum Zeitpunkt des Sendens Ihrer Anfrage an den Server möglicherweise nicht korrekt ist .

Ich habe meine eigene Lösung mit NSTimer und Alamofire erstellt:

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()
    }
}

Der NSTimer wird als Zeitlimit verwendet und wurde aufgrund unzuverlässiger Ergebnisse bei Verwendung des Alamofire-Zeitlimits verwendet. Die Anfrage sollte an eine URL gerichtet werden, der Sie als zuverlässig vertrauen, z. B. Ihren eigenen Server oder den Server, auf dem die Dienste gehostet werden, von denen Sie abhängig sind.

Wenn der Timer abläuft, wird die Anforderung abgebrochen und die Ergebnisse werden mithilfe eines Abschlusshandlers zurückgegeben.

Verwendung:

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

Wenn Sie Alamofire verwenden, können Sie Folgendes tun:

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
                                    }
                                }

hier meine lösung für swift 2.3 mit der lib ( Reachability.swift )

Gehen Sie in Ihre Podfileund fügen Sie hinzu:

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

Dann in deine terminal:

pod install

Erstellen Sie dann eine neue Datei ReachabilityManagerund fügen Sie den folgenden Code hinzu:

import Foundation
import ReachabilitySwift

enum ReachabilityManagerType {
    case Wifi
    case Cellular
    case None
}

class ReachabilityManager {
    static let sharedInstance = 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
    }

}

Wie man es benutzt:

Gehen Sie in Ihre AppDelegate.swiftund fügen Sie den folgenden Code hinzu:

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

Wenn Sie dann überprüfen möchten, ob das Gerät mit dem Internet verbunden ist, gehen Sie wie folgt vor:

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

Während möglicherweise nicht direkt festgestellt wird, ob das Telefon mit einem Netzwerk verbunden ist, besteht die einfachste (, sauberste?) Lösung darin, Google oder einen anderen Server zu "pingen" (was nur möglich ist, wenn das Telefon mit einem Netzwerk verbunden ist) ):

private var urlSession:URLSession = {
    var newConfiguration:URLSessionConfiguration = .default
    newConfiguration.waitsForConnectivity = false
    newConfiguration.allowsCellularAccess = true
    return URLSession(configuration: newConfiguration)
}()

public func canReachGoogle() -> Bool
{
    let url = URL(string: "https://8.8.8.8")
    let semaphore = DispatchSemaphore(value: 0)
    var success = false
    let task = urlSession.dataTask(with: url!)
    { data, response, error in
        if error != nil
        {
            success = false
        }
        else
        {
            success = true
        }
        semaphore.signal()
    }

    task.resume()
    semaphore.wait()

    return success
}

Wenn Sie befürchten, dass der Server ausfällt oder Ihre IP blockiert, können Sie jederzeit mehrere Server auf ähnliche Weise anpingen und zurückgeben, ob einer von ihnen erreichbar ist. Oder lassen Sie jemanden einen dedizierten Server nur für diesen Zweck einrichten.

Swift 5

import SystemConfiguration    

protocol Utilities {}
extension NSObject: Utilities {
    enum ReachabilityStatus {
        case notReachable
        case reachableViaWWAN
        case reachableViaWiFi
    }

    var currentReachabilityStatus: ReachabilityStatus {

        var zeroAddress = sockaddr_in()
        zeroAddress.sin_len = UInt8(MemoryLayout<sockaddr_in>.size)
        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 .notReachable
        }

        var flags: SCNetworkReachabilityFlags = []
        if !SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) {
            return .notReachable
        }

        if flags.contains(.reachable) == false {
            // The target host is not reachable.
            return .notReachable
        }
        else if flags.contains(.isWWAN) == true {
            // WWAN connections are OK if the calling application is using the CFNetwork APIs.
            return .reachableViaWWAN
        }
        else if flags.contains(.connectionRequired) == false {
            // If the target host is reachable and no connection is required then we'll assume that you're on Wi-Fi...
            return .reachableViaWiFi
        }
        else if (flags.contains(.connectionOnDemand) == true || flags.contains(.connectionOnTraffic) == true) && flags.contains(.interventionRequired) == false {
            // The connection is on-demand (or on-traffic) if the calling application is using the CFSocketStream or higher APIs and no [user] intervention is needed
            return .reachableViaWiFi
        }
        else {
            return .notReachable
        }
    }
}

Verwenden Sie bei jeder Methode die folgende Bedingung

if currentReachabilityStatus == .notReachable {
    // Network Unavailable
 } else {
    // Network Available
 }

Mit Hilfe des folgenden Codes können Sie die Internetverbindung sowohl für Mobilfunknetze als auch für WLAN überprüfen. Sprache - 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(kSCNetworkFlagsConnectionRequired)) != 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: "", preferredStyle: 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
    }
  }

}