Betterday: A beautiful calendar - Add To-do animation

This is the most important page design of my app.
When you choose the day and click the add button, a white page will rise up. There are basic details which can be edited.
When finish the editing page, the new event will be added below the calendar with a smooth animation.
If U like it, just press like! Thanks!
Ps: The original animation is mainly made by Principle, the files are given, welcome downloading!