有没有办法在iOS Swift 5上应用程序处于前台时获得推送通知？

import UserNotifications

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) { (granted, error) in
        if granted {
            // 用户授权成功
            DispatchQueue.main.async {
                application.registerForRemoteNotifications()
            }
        } else {
            // 用户授权失败
        }
    }
    return true
}

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    // 将设备令牌发送给服务器
}

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any]) {
    // 处理接收到的推送通知
}

extension AppDelegate: UNUserNotificationCenterDelegate {
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        // 在应用程序前台时展示推送通知
        completionHandler([.alert, .sound, .badge])
    }
}