AppDelegate-2.swift

//get notification device token
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    let deviceTokenString = deviceToken.reduce("") {
        return $0 + String(format: "%02x", $1)
    }
    print(deviceTokenString)
    //save device token
    DeviceToken.save(deviceToken: DeviceToken(token: deviceTokenString))

}

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
    print("在前景收到通知...")
    completionHandler([.badge, .sound, .alert])
}