如何在UserDefault中存储推送通知警报消息？

I want to build an app that I can receive push notification and save inside client device for limit 25 Notification. If application running and may not running. How can I stored PushNotification alert message?. If app running that time arrived Notification alert message stored in UserDefault but when app in background or Inactive state that time not stored Notification alert message in UserDefault. I want to know that I need to use UserDefault or CoreData to store the Push Notification message inside client app or not? If it is not, what should I use? I really need a hand to pick me up.I want to build an app that I can receive push