Reachability.swift class for detecting if network connection is available

Reachability.swift

import Cocoa
import SystemConfiguration

// Usage
// if Reachability.isConnectedToNetwork() {
//   print("We're online!")
// }
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)

    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 as! SCNetworkReachability, &flags) == false {
      return false
    }

    let isReachable = flags == .reachable
    let needsConnection = flags == .connectionRequired

    return isReachable && !needsConnection

  }
}