The last feature of notifications that you will learn about in this chapter is a feature that can really make your notification experience pop. Content extensions enable developers to take custom notification actions to a whole new level. You already know that 3D-Touching a notification will make custom actions pop up. However, the notification maintains a standard look and feel, which might not be exactly what you want.
Consider receiving an invite for an event. The notification allows you to accept the invite, or decline it. Wouldn't it be great if your calendar popped up inside that notification as well, allowing you to check your calendar without having to actually open your calendar app, before ...
