Check if Internet is available including 4G

Question

I'm trying to check if my user has internet available to perform certain tasks such as log in to their user account. I'm currently using the reachability class that used to work but now it only works to check if there's a wifi connection. If my phone is connected to 4G or mobile data, it'll say that there is no internet connection. Is there another way I can check for internet connection?

Thanks for your help in advance! :-)

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
}

}

Possible duplicate of [How to check for an active Internet connection on iOS or OSX?](http://stackoverflow.com/questions/1083701/how-to-check-for-an-active-internet-connection-on-ios-or-osx) — Adrian, Jun 21 '16 at 02:50
^ that method uses the reachability class that i mentioned in my post. Unfortunately, when I use that class, it only detects WiFi and does not detect 4G... — Tim, Jun 21 '16 at 03:06
You edited your post and added in the `Reachability` part subsequent to me posting a comment. http://stackoverflow.com/a/19378112/4475605 — Adrian, Jun 21 '16 at 03:30

score 1 · Accepted Answer · answered Jun 21 '16 at 03:59

Open a new Swift File and Include this class :-

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)

      guard let defaultRouteReachability = withUnsafePointer(&zeroAddress, {
           SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0))
      }) else {
          return false
      }

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

      let isReachable = flags.contains(.Reachable)
      let needsConnection = flags.contains(.ConnectionRequired)
      return (isReachable && !needsConnection)
   }
 }

Then you can check connectivity in another class like

if Reachability.isConnectedToNetwork() { 
  //Has Connectivity
} else {
  //No connection
}

score 0 · Answer 2 · answered Nov 23 '16 at 08:23

Swift 3 version

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 = []
    if SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) == false {
        return false
    }

    let isReachable = flags.contains(.reachable)
    let needsConnection = flags.contains(.connectionRequired)
    return (isReachable && !needsConnection)
}

Check if Internet is available including 4G

2 Answers2