iOS Question Detect if iPhone has caller ID barring on

#If OBJC

//
  // CXCallDirectoryProvider.h
  // CallKit
  //
  // Copyright © 2016 Apple. All rights reserved.
  //

  @available (iOS 10.0, *)
  public class CXCallDirectoryProvider: NSObject, NSExtensionRequestHandling {

  public func beginRequest (with context: CXCallDirectoryExtensionContext )
  }}

   //
  // CXCallDirectoryExtensionContext.h
  // CallKit
  //
  // Copyright © 2016 Apple. All rights reserved.
  // //

  @available (iOS 10.0, *)
  public class CXCallDirectoryExtensionContext: NSExtensionContext {
 
  public func addBlockingEntry (withNextSequentialPhoneNumber phoneNumber: String )
 
  public func addIdentificationEntry (withNextSequentialPhoneNumber phoneNumber: String , label: String)
 
  public func completeRequest (completionHandler completion: ( (Bool) -> Swift Void) = nil.?)
  }}
  import Foundation
  import CallKit

  class CallDirectoryHandler: CXCallDirectoryProvider {

  override func beginRequest (with context: CXCallDirectoryExtensionContext ) {
  // --- 1
  guard let phoneNumbersToBlock = retrievePhoneNumbersToBlock () else {
  NSLog ( "Unable to retrieve phone numbers to block")
  let error = NSError (domain: " CallDirectoryHandler", code: 1, userInfo: nil)
  Context.cancelRequest (withError: error)
  Return
  }}
     
  // --- 2
  for phoneNumber in phoneNumbersToBlock {
  Context.addBlockingEntry (withNextSequentialPhoneNumber: phoneNumber)
  }}
     
  // --- 3
  guard let (phoneNumbersToIdentify, phoneNumberIdentificationLabels) = retrievePhoneNumbersToIdentifyAndLabels () else {
  NSLog ( "Unable to retrieve phone numbers to identify and their labels")
  let error = NSError (domain: " CallDirectoryHandler", code: 2, userInfo: nil)
  Context.cancelRequest (withError: error)
  Return
  }}
     
  // --- 4
  for (phoneNumber, label) in zip (phoneNumbersToIdentify, phoneNumberIdentificationLabels) {
  Context.addIdentificationEntry (withNextSequentialPhoneNumber: phoneNumber, label: label)
  }}
     
  // --- 5
  Context.completeRequest ()
  }}
 
  private func retrievePhoneNumbersToBlock () -> [ String] {?
  // retrieve list of phone numbers to block
  return [ "+ 8618xxxx157"]
  }}
 
  private func retrievePhoneNumbersToIdentifyAndLabels () -> ( phoneNumbers: [String], labels: [String]) {?
  // retrieve list of phone numbers to identify, and their labels
  return ([ "+ 8618xxxx569"] , [ " Test"])
  }}
 
  }}

#End if