App Usage Permission Alert to comply with the new App Store Guidelines

  override func viewDidAppear(_ animated: Bool) {
        if !AppUsagePermission.isAsked(){
            AppUsagePermission.displayAlert(viewController: self, completionHandler: nil)
        }

    }

AppUsagePermission.displayAlert(viewController: self, completionHandler: { result in
                if (result == PermissionStatus.allowed){
                    print("User allowed data usage")
                } else if (result == PermissionStatus.denied){
                    print("User denied data usage")
                }
            })

switch(AppUsagePermission.status()){
        case .allowed:
           print("Permission given")
        case .denied:
            print("Permission denied")
        case .notAsked:
             print("Data usage permission is not yet requested")
        case .undefined:
            print("Something went wrong")
        }

enum PermissionStatus{
   case allowed
   case denied
   case notAsked
   case undefined
}

 if AppUsagePermission.isAsked(){
   print("Dalogue has been already presented to user")
 }

  if AppUsagePermission.isAllowed(){
    print("Send App Data Usage is allowed")
  }

   AppUsagePermission.resetValue()