class Reachability not work iPv6

Question

class Reachability check internet connection. This code

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) {
        //SCNetworkReachabilityCreateWithName(nil, UnsafePointer($0))
        SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0))
    }

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

and test this

if Reachability.isConnectedToNetwork() == true {
   //code
}

how change this code class Reachability for support iPv6 ?