IOS launch Activity.

Okay so I couldn't think of an accurate title but here is basically what I need:

On Android you can make an Activity in Android Studio, build the project, put the .aar file in Unity and then call StartActivity, you can make a UI in Android Studio for example and use this as Main Menu in Unity. My question is whether you can do the same on IOS, can I make a UI in Xcode, build this project, put it into Unity and then call the Activity and use this as Main Menu?

A simple yes/no is enough for me, I just want to know the possibilities, but some sort of explanation would be nice :).