SwiftUI iOS – switch between views but choose which should be shown first – Ios swift

I’m new to Swift and having experience with couple other languages, including JAVA, I must say that Swift is by far the weirdest..

I followed a tutorial on how to create a "switch" view in which I can switch between other views without using NavigationLink

I have those files

Helpfer.swift:

import Foundation

enum Page {
    case login
    case register
}

ViewRouter.swift

import SwiftUI

    class ViewRouter: ObservableObject {
            
        @Published var currentPage: Page = Page.login
        
    }

As you can see the page login is pre set

In the ContentView I have a NavigationLink leading to the "switch" view:

NavigationLink(destination: SwitchView(viewRouter: ViewRouter(), showThisPage: .register).navigationBarBackButtonHidden(true), label: {
    Text("go to switch view")
})

as you can see I want register to be set instead of login this time

I tried all kind of stuff in the SwitchView, this was the last:

import SwiftUI

struct SwitchView: View {
    
    @StateObject var viewRouter: ViewRouter
    var showThisPage: Page
    
    var body: some View {
        
        switch viewRouter.currentPage {
        case .login:
            Login(viewRouter: viewRouter)
        case .register:
            CreateAccount(viewRouter: viewRouter)
        }
    }
}

struct SwitchView_Previews: PreviewProvider {
    static var previews: some View {
        SwitchView(viewRouter: ViewRouter(), showThisPage: Page)
    }
}

and get:

Cannot convert value of type 'Page.Type' to expected argument type 'Page'

EDIT:

It looks like nobody understands what I want, so again and more clearly:

I need to pass showThisPage: .register through NavigationLink in ContentView to SwitchView and in SwitchView I need to catch this value and use it to be recognized in

case .register:
    CreateAccount(viewRouter: viewRouter)
}

How?