【Xcode/Swift】ユーザの通知許可ステータスを取得する方法

import UIKit
import UserNotifications

final class HomeViewController: UIViewController {
    // MARK: - Properties
    @IBOutlet private weak var statusLabel: UILabel!
    @IBOutlet private weak var statusButton: UIButton!

    private let center = UNUserNotificationCenter.current()

    // MARK: - View Life Cycle
    override func viewDidLoad() {
        super.viewDidLoad()
        requestAuthorization()
    }

    private func requestAuthorization() {
        // 通知を表示するための承認がまだない場合は、承認をリクエストする
        center.requestAuthorization(options: [.alert, .sound]) { granted, error in
            if let error = error {
                print("Error requesting authorization: \(error.localizedDescription)")
            } else if granted {
                // Authorizationが許可された場合
                print("Authorization granted")
            } else {
                // Authorizationが拒否された場合
                print("Authorization denied")
            }
        }
    }

    @IBAction func checkNotificationAuthorizationStatus(_ sender: Any) {
        self.center.getNotificationSettings { settings in
            DispatchQueue.main.async {
                switch settings.authorizationStatus {
                case .authorized:
                    self.statusLabel.text = "Status: Authorized"
                case .denied:
                    self.statusLabel.text = "Status: Denied"
                case .notDetermined:
                    self.statusLabel.text = "Status: NotDetermined"
                case .provisional:
                    self.statusLabel.text = "Status: Provisional"
                case .ephemeral:
                    self.statusLabel.text = "Status: Ephemeral"
                @unknown default:
                    fatalError("Unknown authorization status")
                }
            }
        }
    }

}