swift-sample-region-notification-5-1.swift

import UIKit
import CoreLocation
import UserNotifications

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, CLLocationManagerDelegate, UNUserNotificationCenterDelegate{

    var window: UIWindow?
    
    let locationManager = CLLocationManager()
    let notificationCenter = UNUserNotificationCenter.current()

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        return true
    }
}

swift-sample-region-notification-5-2.swift

// called if app is running in foreground
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        
    // show alert while app is running in foreground
    return completionHandler(UNNotificationPresentationOptions.alert)
}