先在 info.plist 加入
要求隨時取得使用者位置的權限
必須兩個都加入
Privacy - Location When In Use Usage Description
Privacy - Location Always Usage Description

iOS 11 之前:
只需設定 Privacy — Location Always Usage Description

在AppDelegate.swift

import UserNotifications
import CoreLocation

設定 AppDelegate 去代理 CLLocationManagerDelegate

AppDelegate : CLLocationManagerDelegate

取得使用者權限的程式碼didFinishLaunchingWithOptions launchOptions，當使用者在開啟程式後就能選擇是否授權

        UNUserNotificationCenter.current().delegate = self
        locationmanager.delegate = self
        locationmanager.desiredAccuracy = kCLLocationAccuracyBestForNavigation
        locationmanager.requestAlwaysAuthorization()
        UNUserNotificationCenter.current().requestAuthorization(options: [.alert,.sound,.badge], completionHandler: {(grand , error)in
            if grand{
                print("允許")
            }else{
                print("拒絕")
            }
        })
        setupData()
        locationmanager.startUpdatingLocation()

這個 func 是為了讓前台運行應用程序時到達的通知，這樣在背景下也能接收通知喔

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        completionHandler([.alert , .badge , .sound])
    }

為了要監控區間，那也需要隨時接收自己的位置，好讓自己有無進入那危險之地

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        
    }