- (BOOL)isInternetOk
{
    Reachability *curReach = [Reachability reachabilityWithHostName:@"apple.com"];
    NetworkStatus netStatus = [curReach currentReachabilityStatus];

    if (netStatus != NotReachable) //if internet connexion ok
    {
        return YES;
    }
    else
    {
        return NO;
    }
}

- (BOOL)isInternetOk2
{
    NSMutableURLRequest* request = [[NSMutableURLRequest alloc] init];
    NSURL* URL = [NSURL URLWithString:@"https://www.google.com"];
    NSError *error = nil;

    [request setURL:URL];
    [request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
    [request setTimeoutInterval:15];

    NSData* response2 = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:&error];
    if (error)
    {
        return NO;
    }
    else
    {
        return YES;
    }
}

NSOperationQueue *myQueue = [[NSOperationQueue alloc] init];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"https://www.google.com"]];
    request.timeoutInterval = 10;

    [NSURLConnection sendAsynchronousRequest:request queue:myQueue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error)
     {
         NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
         NSLog(@"response status code: %ld, error status : %@", (long)[httpResponse statusCode], error.description);

         if ((long)[httpResponse statusCode] >= 200 && (long)[httpResponse statusCode]< 400)
         {
             // do stuff
             NSLog(@"Connected!");
         }
         else
         {
             NSLog(@"Not connected!");
         }
     }];

+(bool)isNetworkAvailable {
    SCNetworkReachabilityFlags flags;
    SCNetworkReachabilityRef address;
    address = SCNetworkReachabilityCreateWithName(NULL, "www.apple.com");
    Boolean success = SCNetworkReachabilityGetFlags(address, &flags);
    CFRelease(address);
    bool canReach = success
    && !(flags & kSCNetworkReachabilityFlagsConnectionRequired)
    && (flags & kSCNetworkReachabilityFlagsReachable);
    return canReach;
}