let current = UNUserNotificationCenter.current()
current.getNotificationSettings(completionHandler: { (settings) in
if settings.authorizationStatus == .notDetermined {
// Notification permission has not been asked yet, go for it!
} else if settings.authorizationStatus == .denied {
// Notification permission was previously denied, go to settings & privacy to re-enable
} else if settings.authorizationStatus == .authorized {
// Notification permission was already granted
}
})