Override Mapbox UIVIew IOS in objective C

I'm trying to override a UIView in Mapbox. But unfortunately the examples are all showing the override to be done only in the viewDidLoad event. I'm struggling to understand how this works. I'm using react native actually but I need to update something(annotation marker) but it can only be done natively.

I thought of updating the UIVIew only but if i need to include the UIViewController, how can i include that? I just don't understand how that would work. Any help would be great!!!!