I have a developed app which is developed by using Swift 3.0. I've used Firebase in the backend and now I want to add notifications screen. It is very similar to the one in Instagram.
About the app : Users create events (called Hives) and other users can attend these events
Notifications : In only 2 conditions notifications will be sent;
1- If an user attends the Hive you are created or attending.
2- If the end time of the Hive you created or attending is soon (in 1 hour).
It shouldn't take more than 1-2 hours.