xamario ios crop image like andorid

I'm new to xamarin iOS, so maybe the question is somehow silly.

I want to take a photo, and afterwards make the posibility for the user to crop the image to any size he wants, like in android:

or in the galery like this other question:

iOS - how to implement crop image like default photo album?

I think the answer for that question is pretty good, but all the controlls that I have fond are in Objective-C, and I don't know how to translate it to c# for xamarin...

Does exists some control (or built in option in iOS) to make the crop resizable?