How to check for an active Internet connection on iOS or macOS

Question

I would like to check to see if I have an Internet connection on iOS using the Cocoa Touch libraries or on macOS using the Cocoa libraries   I came up with a way to do this using an NSURL  The way I did it seems a bit unreliable  because even Google could one day be down and relying on a third party seems bad   and while I could check to see for a response from some other websites if Google didn t respond  it does seem wasteful and an unnecessary overhead on my application   -  BOOL  connectedToInternet       NSString  URLString    NSString stringWithContentsOfURL  NSURL URLWithString   http   www google com         return   URLString    NULL     YES   NO      Is what I have done bad   not to mention stringWithContentsOfURL is deprecated in iOS 3 0 and macOS 10 4  and if so  what is a better way to accomplish this

User · Answer

Only the Reachability class has been updated  You can now use   Reachability  reachability    Reachability reachabilityWithHostName   www apple com    NetworkStatus remoteHostStatus    reachability currentReachabilityStatus    if  remoteHostStatus    NotReachable    NSLog   not reachable     else if  remoteHostStatus    ReachableViaWWAN    NSLog   reachable via wwan     else if  remoteHostStatus    ReachableViaWiFi    NSLog   reachable via wifi

User · Answer

Here s a very simple answer   NSURL  scriptUrl    NSURL URLWithString   http   www google com m    NSData  data    NSData dataWithContentsOfURL scriptUrl   if  data      NSLog   Device is connected to the Internet    else     NSLog   Device is not connected to the Internet      The URL should point to an extremely small website  I use Google s mobile website here  but if I had a reliable web server I d upload a small file with just one character in it for maximum speed   If checking whether the device is somehow connected to the Internet is everything you want to do  I d definitely recommend using this simple solution  If you need to know how the user is connected  using Reachability is the way to go   Careful  This will briefly block your thread while it loads the website  In my case  this wasn t a problem  but you should consider this  credits to Brad for pointing this out

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Alamofire  I know the question is asking for Coca Touch solution  but I want to provide a solution for people who searched check internet connection on iOS and will have one more option here   If you are already using Alamofire  here is what you can benifit from that   You can add following class to your app  and call MNNetworkUtils main isConnected   to get a boolean on whether its connected or not    import Alamofire  class MNNetworkUtils     static let main   MNNetworkUtils     init         manager   NetworkReachabilityManager host   google com       listenForReachability          private let manager  NetworkReachabilityManager    private var reachable  Bool   false   private func listenForReachability         self manager  listener      unowned self  status in       switch status         case  notReachable          self reachable   false       case  reachable      unknown          self reachable   true                   self manager  startListening          func isConnected   - gt  Bool       return reachable         This is a singleton class  Every time  when user connect or disconnect the network  it will override self reachable to true false correctly  because we start listening for the NetworkReachabilityManager on singleton initialization   Also in order to monitor reachability  you need to provide a host  currently I am using google com feel free to change to any other hosts or one of yours if needed  Change the class name and file name to anything matching your project

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Important  This check should always be performed asynchronously  The majority of answers below are synchronous so be careful otherwise you ll freeze up your app     Swift  1  Install via CocoaPods or Carthage  https   github com ashleymills Reachability swift  2  Test reachability via closures  let reachability   Reachability     reachability whenReachable     reachability in     if reachability connection     wifi           print  Reachable via WiFi         else           print  Reachable via Cellular            reachability whenUnreachable       in     print  Not reachable      do       try reachability startNotifier     catch       print  Unable to start notifier         Objective-C  1  Add SystemConfiguration framework to the project but don t worry about including it anywhere  2  Add Tony Million s version of Reachability h and Reachability m to the project  found here  https   github com tonymillion Reachability   3  Update the interface section   import  Reachability h      Add this to the interface in the  m file of your view controller  interface MyViewController          Reachability  internetReachableFoo     end   4  Then implement this method in the  m file of your view controller which you can call     Checks if we have an internet connection or not -  void testInternetConnection          internetReachableFoo    Reachability reachabilityWithHostname   www google com            Internet is reachable     internetReachableFoo reachableBlock     Reachability reach                   Update the UI on the main thread         dispatch async dispatch get main queue                   NSLog   Yayyy  we have the interwebs                                Internet is not reachable     internetReachableFoo unreachableBlock     Reachability reach                   Update the UI on the main thread         dispatch async dispatch get main queue                   NSLog   Someone broke the internet                                internetReachableFoo startNotifier       Important Note  The Reachability class is one of the most used classes in projects so you might run into naming conflicts with other projects   If this happens  you ll have to rename one of the pairs of Reachability h and Reachability m files to something else to resolve the issue   Note  The domain you use doesn t matter  It s just testing for a gateway to any domain

User · Answer

Import Reachable h class in your ViewController  and use the following code to check connectivity   define hasInternetConnection   Reachability reachabilityForInternetConnection  isReachable  if  hasInternetConnection            To-do block

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Pod  Alamofire  has  NetworkReachabilityManager   you just have to create one function   func isConnectedToInternet   - gt Bool           return NetworkReachabilityManager    isReachable

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Swift 3   Swift 4  You must first import  import SystemConfiguration   You can check internet connection with the following method  func isConnectedToNetwork   - gt  Bool        var zeroAddress   sockaddr in       zeroAddress sin len   UInt8 MemoryLayout size ofValue  zeroAddress       zeroAddress sin family   sa family t AF INET       let defaultRouteReachability   withUnsafePointer to   amp zeroAddress             0 withMemoryRebound to  sockaddr self  capacity  1   zeroSockAddress in             SCNetworkReachabilityCreateWithAddress nil  zeroSockAddress                       var flags   SCNetworkReachabilityFlags       if  SCNetworkReachabilityGetFlags defaultRouteReachability    amp flags            return false           let isReachable    flags rawValue  amp  UInt32 kSCNetworkFlagsReachable      0     let needsConnection    flags rawValue  amp  UInt32 kSCNetworkFlagsConnectionRequired      0     return  isReachable  amp  amp   needsConnection

User · Answer

Apple supplies sample code to check for different types of network availability  Alternatively there is an example in the iPhone developers cookbook   Note  Please see  KHG s comment on this answer regarding the use of Apple s reachability code

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Create an object of AFNetworkReachabilityManager and use the following code to track the network connectivity  self reachabilityManager    AFNetworkReachabilityManager managerForDomain   yourDomain     self reachabilityManager startMonitoring    self reachabilityManager setReachabilityStatusChangeBlock   AFNetworkReachabilityStatus status            switch  status                case AFNetworkReachabilityStatusReachableViaWWAN              case AFNetworkReachabilityStatusReachableViaWiFi                  break              case AFNetworkReachabilityStatusNotReachable                  break              default                  break

User · Answer

Get the Reachabilty class from https   github com tonymillion Reachability  add the system configuration framework in your project  do import Reachability h in your class and implement the custom methods as below   -  BOOL isConnectedToInternet         return NO     Force for offline testing     Reachability  hostReach    Reachability reachabilityForInternetConnection       NetworkStatus netStatus    hostReach currentReachabilityStatus       return   netStatus    NotReachable

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see Introducing Network framework  A modern alternative to Sockets https   developer apple com videos play wwdc2018 715  we should get rid of Reachability at some point

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Swift 5  Alamofire  host   Session reference var alamofireSessionManager  Session   func checkHostReachable completionHandler   escaping    isReachable Bool  - gt  Void        let configuration   URLSessionConfiguration default     configuration timeoutIntervalForRequest   1     configuration timeoutIntervalForResource   1     configuration requestCachePolicy    reloadIgnoringLocalCacheData      alamofireSessionManager   Session configuration  configuration       alamofireSessionManager request  quot https   google com quot   response   response in         completionHandler response response  statusCode    200             using checkHostReachable      isReachable  in     print  quot isReachable   isReachable  quot

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Try this   -  void  connection  NSURLConnection   connection didFailWithError  NSError   error   if   self delegate respondsToSelector  selector getErrorResponse            self delegate performSelector  selector getErrorResponse   withObject   No Network Connection       UIAlertView  alertView     UIAlertView alloc  initWithTitle   BMC  message   No Network Connection  delegate self cancelButtonTitle nil otherButtonTitles   OK  nil    alertView show

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I ve used the code in this discussion  and it seems to work fine  read the whole thread     I haven t tested it exhaustively with every conceivable kind of connection  like ad hoc Wi-Fi

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- void newtworkType     NSArray  subviews       UIApplication sharedApplication  valueForKey   statusBar   valueForKey   foregroundView  subviews   NSNumber  dataNetworkItemView   nil   for  id subview in subviews        if  subview isKindOfClass  NSClassFromString   UIStatusBarDataNetworkItemView   class              dataNetworkItemView   subview          break            switch    dataNetworkItemView valueForKey   dataNetworkType  integerValue         case 0          NSLog   No wifi or cellular            break       case 1          NSLog   2G            break       case 2          NSLog   3G            break       case 3          NSLog   4G            break       case 4          NSLog   LTE            break       case 5          NSLog   Wifi            break        default          break

User · Answer

Please try this  it will help you  Swift 4   1  Install Reachability via CocoaPods or Carthage  Reachability  2  Import Reachability and Use in Network Class  import Reachability class Network       private let internetReachability   Reachability     var isReachable   Bool   false     init             self internetReachability   Reachability init          do             try self internetReachability  startNotifier              NotificationCenter default addObserver self  selector   selector self handleNetworkChange   name   reachabilityChanged  object  internetReachability                  catch           print  could not start reachability notifier                      objc private func handleNetworkChange notify  Notification            let reachability   notify object as  Reachability        if reachability connection     none              self isReachable   true                 else              self isReachable   false                 print  Internet Connected     self isReachable      Print Status of Network Connection          3  Use like Below where You need   var networkOBJ   Network      Use  networkOBJ isReachable  for Network Status print networkOBJ isReachable

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First  Add CFNetwork framework in framework  Code  ViewController m   import  Reachability h   -  void viewWillAppear  BOOL animated       Reachability  r    Reachability reachabilityWithHostName   www google com        NetworkStatus internetStatus    r currentReachabilityStatus        if   internetStatus    ReachableViaWiFi   amp  amp   internetStatus    ReachableViaWWAN                     Create an alert if connection doesn t work         UIAlertView  myAlert     UIAlertView alloc initWithTitle   No Internet Connection    message NSLocalizedString   InternetMessage   nil delegate nil cancelButtonTitle   Ok  otherButtonTitles nil            myAlert show            myAlert release             else                NSLog   INTERNET IS CONNECT

User · Answer

I found it simple and easy to use library SimplePingHelper   Sample code  chrishulbert SimplePingHelper  GitHub

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To do this yourself is extremely simple  The following method will work  Just be sure to not allow a hostname protocol such as HTTP  HTTPS  etc  to be passed in with the name   - BOOL hasInternetConnection  NSString  urlAddress       SCNetworkReachabilityRef ref   SCNetworkReachabilityCreateWithName kCFAllocatorDefault   urlAddress UTF8String        SCNetworkReachabilityFlags flags      if   SCNetworkReachabilityGetFlags ref   amp flags                 return NO            return flags  amp  kSCNetworkReachabilityFlagsReachable      It is quick simple and painless

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The Reachability class is OK to find out if the Internet connection is available to a device or not     But in case of accessing an intranet resource   Pinging the intranet server with the reachability class always returns true   So a quick solution in this scenario would be to create a web method called pingme along with other webmethods on the service  The pingme should return something   So I wrote the following method on common functions  - BOOL PingServiceServer       NSURL  url  NSURL URLWithString   http   www serveraddress service asmx Ping         NSMutableURLRequest  urlReq  NSMutableURLRequest requestWithURL url         urlReq setTimeoutInterval 10        NSURLResponse  response       NSError  error   nil       NSData  receivedData    NSURLConnection sendSynchronousRequest urlReq                                                  returningResponse  amp response                                                              error  amp error       NSLog   receivedData     receivedData        if  receivedData   nil                return YES            else               NSLog   Data is null            return NO            The above method was so useful for me  so whenever I try to send some data to the server I always check the reachability of my intranet resource using this low timeout URLRequest

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You could use Reachability by    available here     import  Reachability h   -  BOOL networkConnection       return   Reachability reachabilityWithHostName   www google com   currentReachabilityStatus      if   self networkConnection     NotReachable       No Network      else      Network        Use ReachableViaWiFi   ReachableViaWWAN to get the type of connection

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import  quot Reachability h quot  - BOOL netStat       Reachability  test    Reachability reachabilityForInternetConnection       return  test isReachable

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First download the reachability class and put reachability h and reachabilty m file in your Xcode   The best way is to make a common Functions class  NSObject  so that you can use it any class  These are two methods for a network connection reachability check     BOOL  reachabiltyCheck       NSLog   reachabiltyCheck        BOOL status  YES        NSNotificationCenter defaultCenter  addObserver self                                           selector  selector reachabilityChanged                                             name kReachabilityChangedNotification                                           object nil       Reachability   reach    Reachability reachabilityForInternetConnection       NSLog   status    d   reach currentReachabilityStatus        if  reach currentReachabilityStatus   0                status   NO          NSLog   network not connected              reach reachableBlock     Reachability   reachability                dispatch async dispatch get main queue                              reach unreachableBlock     Reachability   reachability                dispatch async dispatch get main queue                               reach startNotifier       return status       BOOL reachabilityChanged  NSNotification  note       BOOL status  YES      NSLog   reachabilityChanged        Reachability   reach    note object       NetworkStatus netStatus    reach currentReachabilityStatus       switch  netStatus                case NotReachable                                status   NO                  NSLog   Not Reachable                              break           default                                if   isSyncingReportPulseFlag                                        status   YES                      isSyncingReportPulseFlag   TRUE                       DatabaseHandler checkForFailedReportStatusAndReSync                                               break            return status        BOOL  connectedToNetwork          Create zero addy     struct sockaddr in zeroAddress      bzero  amp zeroAddress  sizeof zeroAddress        zeroAddress sin len   sizeof zeroAddress       zeroAddress sin family   AF INET          Recover reachability flags     SCNetworkReachabilityRef defaultRouteReachability   SCNetworkReachabilityCreateWithAddress NULL   struct sockaddr    amp zeroAddress       SCNetworkReachabilityFlags flags      BOOL didRetrieveFlags   SCNetworkReachabilityGetFlags defaultRouteReachability   amp flags       CFRelease defaultRouteReachability       if   didRetrieveFlags                NSLog   Error  Could not recover network reachability flags            return NO            BOOL isReachable   flags  amp  kSCNetworkFlagsReachable      BOOL needsConnection   flags  amp  kSCNetworkFlagsConnectionRequired      BOOL nonWiFi   flags  amp  kSCNetworkReachabilityFlagsTransientConnection      NSURL  testURL    NSURL URLWithString   http   www apple com         NSURLRequest  testRequest    NSURLRequest requestWithURL testURL  cachePolicy NSURLRequestReloadIgnoringLocalCacheData timeoutInterval 20 0       NSURLConnection  testConnection     NSURLConnection alloc  initWithRequest testRequest delegate self       return   isReachable  amp  amp   needsConnection     nonWiFi     testConnection   YES   NO    NO      Now you can check network connection in any class by calling this class method

User · Answer

Very simple     Try these steps   Step 1  Add the SystemConfiguration framework into your project     Step 2  Import the following code into your header file    import  lt SystemConfiguration SystemConfiguration h gt      Step 3  Use the following method   Type 1   -  BOOL  currentNetworkStatus        UIApplication sharedApplication  networkActivityIndicatorVisible   NO      BOOL connected      BOOL isConnected      const char  host    www apple com       SCNetworkReachabilityRef reachability   SCNetworkReachabilityCreateWithName NULL  host       SCNetworkReachabilityFlags flags      connected   SCNetworkReachabilityGetFlags reachability   amp flags       isConnected   NO      isConnected   connected  amp  amp   flags  amp  kSCNetworkFlagsReachable   amp  amp    flags  amp  kSCNetworkFlagsConnectionRequired       CFRelease reachability       return isConnected          Type 2   Import header    import  Reachability h   -  BOOL currentNetworkStatus       Reachability  reachability    Reachability reachabilityForInternetConnection       NetworkStatus networkStatus    reachability currentReachabilityStatus       return networkStatus    NotReachable         Step 4  How to use   -  void CheckInternet       BOOL network    self currentNetworkStatus       if  network                NSLog   Network Available              else               NSLog   No Network Available

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Apple provides a sample app which does exactly this   Reachability

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For my iOS Projects  I recommend using      Reachability Class   Declared in Swift  For me  it works simply fine with      Wi-Fi and Cellular data       import SystemConfiguration   public class Reachability     class func isConnectedToNetwork   - gt  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   amp zeroAddress             0 withMemoryRebound to  sockaddr self  capacity  1   zeroSockAddress in             SCNetworkReachabilityCreateWithAddress nil  zeroSockAddress                       var flags  SCNetworkReachabilityFlags   SCNetworkReachabilityFlags rawValue  0      if SCNetworkReachabilityGetFlags defaultRouteReachability    amp flags     false           return false            let isReachable    flags rawValue  amp  UInt32 kSCNetworkFlagsReachable      0     let needsConnection    flags rawValue  amp  UInt32 kSCNetworkFlagsConnectionRequired      0     let ret    isReachable  amp  amp   needsConnection      return ret       Use conditional statement   if Reachability isConnectedToNetwork                Enter Your Code Here                      else          print  NO Internet connection           This class is useful in almost every case your app uses the Internet Connection  Such as if the condition is true  API can be called or task could be performed

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Connectivity swift            Created by Kausik Jati on 17 07 20          import Foundation import Network  enum ConnectionState  String       case notConnected    quot Internet connection not avalable quot      case connected    quot Internet connection avalable quot      case slowConnection    quot Internet connection poor quot    protocol ConnectivityDelegate  class       func checkInternetConnection   state  ConnectionState  isLowDataMode  Bool    class Connectivity  NSObject       private let monitor   NWPathMonitor       weak var delegate  ConnectivityDelegate    nil     private let queue   DispatchQueue global qos   background      private var isLowDataMode   false     static let instance   Connectivity   private override init         super init       monitor start queue  queue      startMonitorNetwork     private func startMonitorNetwork         monitor pathUpdateHandler     path in         if  available iOS 13 0                   self isLowDataMode   path isConstrained           else                  Fallback on earlier versions             self isLowDataMode   false                            if path status     requiresConnection               print  quot requiresConnection quot                   self delegate  checkInternetConnection  slowConnection  isLowDataMode  self isLowDataMode            else if path status     satisfied               print  quot satisfied quot                    self delegate  checkInternetConnection  connected  isLowDataMode  self isLowDataMode            else if path status     unsatisfied               print  quot unsatisfied quot                   self delegate  checkInternetConnection  notConnected  isLowDataMode  self isLowDataMode                                         func stopMonitorNetwork             monitor cancel

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swift5  public class Reachability       class func isConnectedToNetwork   - gt  Bool           var zeroAddress   sockaddr in           zeroAddress sin len   UInt8 MemoryLayout lt sockaddr in gt  size          zeroAddress sin family   sa family t AF INET                   guard let defaultRouteReachability   withUnsafePointer to   amp zeroAddress                 0 withMemoryRebound to  sockaddr self  capacity  1                    SCNetworkReachabilityCreateWithAddress nil   0                           else               return false                            var flags  SCNetworkReachabilityFlags              if  SCNetworkReachabilityGetFlags defaultRouteReachability   amp flags                return false                            let isReachable   flags contains  reachable          let needsConnection   flags contains  connectionRequired                   return  isReachable  amp  amp   needsConnection         Call this Class like this       if Reachability isConnectedToNetwork      true                         do something                   else                         do something

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A version on Reachability for iOS 5 is darkseed Reachability h  It s not mine

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There is also another method to check Internet connection using the iPhone SDK   Try to implement the following code for the network connection    import  lt SystemConfiguration SystemConfiguration h gt   include  lt netdb h gt            Checking for network availability  It returns      YES if the network is available        BOOL  connectedToNetwork           Create zero addy     struct sockaddr in zeroAddress      bzero  amp zeroAddress  sizeof zeroAddress        zeroAddress sin len   sizeof zeroAddress       zeroAddress sin family   AF INET          Recover reachability flags     SCNetworkReachabilityRef defaultRouteReachability           SCNetworkReachabilityCreateWithAddress NULL   struct sockaddr    amp zeroAddress       SCNetworkReachabilityFlags flags       BOOL didRetrieveFlags   SCNetworkReachabilityGetFlags defaultRouteReachability   amp flags       CFRelease defaultRouteReachability        if   didRetrieveFlags                printf  Error  Could not recover network reachability flags n            return NO             BOOL isReachable     flags  amp  kSCNetworkFlagsReachable     0       BOOL needsConnection     flags  amp  kSCNetworkFlagsConnectionRequired     0        return  isReachable  amp  amp   needsConnection    YES   NO

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Here is how I do it in my apps  While a 200 status response code doesn t guarantee anything  it is stable enough for me  This doesn t require as much loading as the NSData answers posted here  as mine just checks the HEAD response   Swift Code  func checkInternet flag Bool  completionHandler  internet Bool  - gt  Void        UIApplication sharedApplication   networkActivityIndicatorVisible   true      let url   NSURL string   http   www google com        let request   NSMutableURLRequest URL  url        request HTTPMethod    HEAD      request cachePolicy   NSURLRequestCachePolicy ReloadIgnoringLocalAndRemoteCacheData     request timeoutInterval   10 0      NSURLConnection sendAsynchronousRequest request  queue NSOperationQueue mainQueue    completionHandler        response  NSURLResponse   data  NSData   error  NSError   - gt  Void in          UIApplication sharedApplication   networkActivityIndicatorVisible   false          let rsp   response as  NSHTTPURLResponse           completionHandler internet rsp  statusCode    200            func yourMethod         self checkInternet false  completionHandler        internet Bool  - gt  Void in          if  internet                            Internet  aka Google URL reachable                   else                          No  Internet  aka Google URL un-reachable                      Objective-C Code  typedef void  connection  BOOL    -  void checkInternet  connection block       NSURL  url    NSURL URLWithString   http   www google com         NSMutableURLRequest  headRequest    NSMutableURLRequest requestWithURL url       headRequest HTTPMethod     HEAD        NSURLSessionConfiguration  defaultConfigObject    NSURLSessionConfiguration ephemeralSessionConfiguration       defaultConfigObject timeoutIntervalForResource   10 0      defaultConfigObject requestCachePolicy   NSURLRequestReloadIgnoringLocalAndRemoteCacheData       NSURLSession  defaultSession    NSURLSession sessionWithConfiguration defaultConfigObject delegate self delegateQueue   NSOperationQueue mainQueue         NSURLSessionDataTask  dataTask    defaultSession dataTaskWithRequest headRequest         completionHandler   NSData  data  NSURLResponse  response  NSError  error                if   error  amp  amp  response                        block   NSHTTPURLResponse   response statusCode     200                          dataTask resume      -  void yourMethod        self checkInternet   BOOL internet                 if  internet                              Internet  aka Google URL reachable                     else                            No  Internet  aka Google URL un-reachable

User · Answer

Checking the Internet connection availability in  iOS  Xcode 8   Swift 3 0  This is simple method for checking the network availability like our device is connected to any network or not  I have managed to translate it to Swift 3 0 and here the final code  The existing Apple Reachability class and other third party libraries seemed to be too complicated to translate to Swift  This works for both 3G 4G and WiFi connections  Don   t forget to add    SystemConfiguration framework    to your project builder     Create new swift class file Reachability in your project  import SystemConfiguration public class InternetReachability    class func isConnectedToNetwork   - gt  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  amp zeroAddress              SCNetworkReachabilityCreateWithAddress nil  UnsafePointer  0   takeRetainedValue           var flags  SCNetworkReachabilityFlags   0    if SCNetworkReachabilityGetFlags defaultRouteReachability   amp flags     0             return false         let isReachable    flags  amp  UInt32 kSCNetworkFlagsReachable      0    let needsConnection    flags  amp  UInt32 kSCNetworkFlagsConnectionRequired      0     return isReachable  amp  amp   needsConnection           Check network connectivity from anywhere in project by using this code   if InternetReachability isConnectedToNetwork      true            print  quot Internet connection OK quot       else            print  quot Internet connection FAILED quot

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I think this one is the best answer    Yes  means connected   No  means disconnected    import  Reachability h    -  BOOL canAccessInternet       Reachability  IsReachable    Reachability reachabilityForInternetConnection       NetworkStatus internetStats    IsReachable currentReachabilityStatus        if  internetStats    NotReachable                return NO            else               return YES

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I like to keep things simple  The way I do this is     Class h  import  Reachability h   import  lt SystemConfiguration SystemConfiguration h gt   -  BOOL connected     Class m -  BOOL connected       Reachability  reachability    Reachability reachabilityForInternetConnection       NetworkStatus networkStatus    reachability currentReachabilityStatus       return networkStatus    NotReachable      Then  I use this whenever I want to see if I have a connection   if    self connected            Not connected   else          Connected  Do some Internet stuff     This method doesn t wait for changed network statuses in order to do stuff  It just tests the status when you ask it to

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If you re using AFNetworking you can use its own implementation for internet reachability status   The best way to use AFNetworking is to subclass the AFHTTPClient class and use this class to do your network connections   One of the advantages of using this approach is that you can use blocks to set the desired behavior when the reachability status changes  Supposing that I ve created a singleton subclass of AFHTTPClient  as said on the  Subclassing notes  on AFNetworking docs  named BKHTTPClient  I d do something like   BKHTTPClient  httpClient    BKHTTPClient sharedClient    httpClient setReachabilityStatusChangeBlock   AFNetworkReachabilityStatus status        if  status    AFNetworkReachabilityStatusNotReachable                Not reachable           else                  Reachable             You could also check for Wi-Fi or WLAN connections specifically using the AFNetworkReachabilityStatusReachableViaWWAN and AFNetworkReachabilityStatusReachableViaWiFi enums  more here

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Use http   huytd github io datatify   It s easier than adding libraries and write code by yourself

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-  void viewWillAppear  BOOL animated       NSString  URL    NSString stringWithContentsOfURL  NSURL URLWithString   http   www google com          return  URL    NULL     YES   NO      Or use the Reachability class   There are two ways to check Internet availability using the iPhone SDK   1  Check the Google page is opened or not   2  Reachability Class  For more information  please refer to Reachability  Apple Developer

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Download the Reachability file  https   gist github com darkseed 1182373 And add CFNetwork framework and  SystemConfiguration framework  in framework Do  import  Reachability h      First  Add CFNetwork framework in framework  Code  ViewController m  -  void viewWillAppear  BOOL animated       Reachability  r    Reachability reachabilityWithHostName   www google com        NetworkStatus internetStatus    r currentReachabilityStatus        if   internetStatus    ReachableViaWiFi   amp  amp   internetStatus    ReachableViaWWAN                     Create an alert if connection doesn t work         UIAlertView  myAlert     UIAlertView alloc initWithTitle   No Internet Connection    message NSLocalizedString   InternetMessage   nil delegate nil cancelButtonTitle   Ok  otherButtonTitles nil            myAlert show            myAlert release             else                NSLog   INTERNET IS CONNECT

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This is for SWIFT 3 0 and async  Most answers are sync solution which is gonna block your main thread if you have a very slow connection  This solution is better but not perfect because it rely on Google to check the connectivity so feel free to use an other url   func checkInternetConnection completionHandler  escaping  Bool  - gt  Void        if let url   URL string   http   www google com                  var request   URLRequest url  url          request httpMethod    HEAD          request cachePolicy    reloadIgnoringLocalAndRemoteCacheData         request timeoutInterval   5          let tast   URLSession shared dataTask with  request  completionHandler                         data  response  error  in              completionHandler error    nil                     tast resume             else               completionHandler true

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Step 1  Add the Reachability class in your Project  Step 2  Import the Reachability class Step 3  Create the below function  -  BOOL checkNetConnection       self internetReachability    Reachability reachabilityForInternetConnection        self internetReachability startNotifier       NetworkStatus netStatus    self internetReachability currentReachabilityStatus       switch  netStatus            case NotReachable                        return NO                     case ReachableViaWWAN                         return YES                     case ReachableViaWiFi                         return YES                     Step 4  Call the function as below   if    self checkNetConnection          GlobalFunctions showAlert                          message   Please connect to the Internet                        canBtntitle nil                      otherBtnTitle   Ok        return    else       Log v  internet is connected   ok

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This used to be the correct answer  but it is now outdated as you should subscribe to notifications for reachability instead  This method checks synchronously     You can use Apple s Reachability class  It will also allow you to check if Wi-Fi is enabled   Reachability  reachability    Reachability sharedReachability    reachability setHostName   www example com          Set your host name here NetworkStatus remoteHostStatus    reachability remoteHostStatus    if  remoteHostStatus    NotReachable      else if  remoteHostStatus    ReachableViaWiFiNetwork      else if  remoteHostStatus    ReachableViaCarrierDataNetwork         The Reachability class is not shipped with the SDK  but rather a part of this Apple sample application  Just download it  and copy Reachability h m to your project  Also  you have to add the SystemConfiguration framework to your project

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There s a nice-looking  ARC- and GCD-using modernization of Reachability here   Reachability

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Using Apple s Reachability code  I created a function that ll check this correctly without you having to include any classes   Include the SystemConfiguration framework in your project   Make some imports    import  lt sys socket h gt   import  lt netinet in h gt   import  lt SystemConfiguration SystemConfiguration h gt    Now just call this function      Connectivity testing code pulled from Apple s Reachability Example  https   developer apple com library content samplecode Reachability       BOOL hasConnectivity       struct sockaddr in zeroAddress      bzero  amp zeroAddress  sizeof zeroAddress        zeroAddress sin len   sizeof zeroAddress       zeroAddress sin family   AF INET       SCNetworkReachabilityRef reachability   SCNetworkReachabilityCreateWithAddress kCFAllocatorDefault   const struct sockaddr   amp zeroAddress       if  reachability    NULL              NetworkStatus retVal   NotReachable          SCNetworkReachabilityFlags flags          if  SCNetworkReachabilityGetFlags reachability   amp flags                 if   flags  amp  kSCNetworkReachabilityFlagsReachable     0                                   If target host is not reachable                 return NO                             if   flags  amp  kSCNetworkReachabilityFlagsConnectionRequired     0                                   If target host is reachable and no connection is required                     then we ll assume  for now  that your on Wi-Fi                 return YES                              if     flags  amp  kSCNetworkReachabilityFlagsConnectionOnDemand      0                       flags  amp  kSCNetworkReachabilityFlagsConnectionOnTraffic     0                                        and the connection is on-demand  or on-traffic  if the                        calling application is using the CFSocketStream or higher APIs                   if   flags  amp  kSCNetworkReachabilityFlagsInterventionRequired     0                                               and no  user  intervention is needed                     return YES                                               if   flags  amp  kSCNetworkReachabilityFlagsIsWWAN     kSCNetworkReachabilityFlagsIsWWAN                                       but WWAN connections are OK if the calling application                        is using the CFNetwork  CFSocketStream   APIs                  return YES                                     return NO      And it s iOS nbsp 5 tested for you

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Apart from reachability you may also use the Simple Ping helper library  It works really nice and is simple to integrate

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Check internet connection availability in  iOS  using Xcode 9  amp  Swift 4 0  Follow Below steps  Step 1  Create an extension file and give it the name  ReachabilityManager swift then add the lines of code below   import Foundation import SystemConfiguration public class ConnectionCheck           class func isConnectedToNetwork   - gt  Bool           var zeroAddress   sockaddr in       zeroAddress sin len   UInt8 MemoryLayout lt sockaddr in gt  size      zeroAddress sin family   sa family t AF INET       guard let defaultRouteReachability   withUnsafePointer to   amp zeroAddress                          0 withMemoryRebound to  sockaddr self  capacity  1                SCNetworkReachabilityCreateWithAddress nil   0                   else           return false            var flags  SCNetworkReachabilityFlags          if  SCNetworkReachabilityGetFlags defaultRouteReachability   amp flags            return false            let isReachable   flags contains  reachable      let needsConnection   flags contains  connectionRequired       return  isReachable  amp  amp   needsConnection             Step 2  Call the extension above using the code below   if ConnectionCheck isConnectedToNetwork          print  Connected          Online related Business logic   else       print  disConnected           offline related business logic

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When using iOS 12 or macOS 10 14 or newer  you can use NWPathMonitor instead of the pre-historic Reachability class  As a bonus you can easily detect the current network connection type  import Network    Put this on top of your class  let monitor   NWPathMonitor        monitor pathUpdateHandler     path in     if path status     satisfied              Not connected           else if path usesInterfaceType  cellular               Cellular 3 4 5g connection           else if path usesInterfaceType  wifi               Wi-fi connection           else if path usesInterfaceType  wiredEthernet               Ethernet connection           monitor start queue  DispatchQueue global qos   background      More info here  https   developer apple com documentation network nwpathmonitor

[ios] How to check for an active Internet connection on iOS or macOS?

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