UNNotificationAction
UNNotificationCategory
UNCalendarNotificationTrigger
UNMutableNotificationContent
UNNotificationAttachment
UNNotificationRequest
/// Remove pending notifications to avoid duplicates.
UNUserNotificationCenter.current().removeAllPendingNotificationRequests()
/// Provide request to notification center.
UNUserNotificationCenter.current().add(notiRequest) { (error) in
if let error = error {
print("Error: " + error.localizedDescription)
}
}