Checking Local Network Privacy access state for iOS 14

LocalNetworkPrivacy.swift

//
//  LocalNetworkPrivacy
//
//  Created by Iurii Khvorost <iurii.khvorost@gmail.com> on 2021/02/04.
//  Copyright © 2021 Iurii Khvorost. All rights reserved.
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

import UIKit
import Foundation

class LocalNetworkPrivacy : NSObject {
	let service: NetService

	var completion: ((Bool) -> Void)?
	var timer: Timer?
	var publishing = false
	
	override init() {
		service = .init(domain: "local.", type:"_lnp._tcp.", name: "LocalNetworkPrivacy", port: 1100)
		super.init()
	}
	
	func checkAccessState(completion: @escaping (Bool) -> Void) {
		self.completion = completion
		
		timer = .scheduledTimer(withTimeInterval: 2, repeats: true, block: { timer in
			guard UIApplication.shared.applicationState == .active else {
				return
			}
			
			if self.publishing {
				self.timer?.invalidate()
				self.completion?(false)
			}
			else {
				self.publishing = true
				self.service.delegate = self
				self.service.publish()
				
			}
		})
	}
	
	deinit {
		service.stop()
	}
}

extension LocalNetworkPrivacy : NetServiceDelegate {
	
	func netServiceDidPublish(_ sender: NetService) {
		timer?.invalidate()
		completion?(true)
	}
}

// How to use
// NOTE: Don't forget to set NSLocalNetworkUsageDescription and add "_lnp._tcp." to NSBonjourServices in your Info.plist.

LocalNetworkPrivacy().checkAccessState { granted in
    print(granted)
}