SwiftUI iOS - switch between views but choose which should be shown first-CodePudding

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'

So how to do this correctly? Is it even possible? I've read that swift is very limited and you can't do much with it

CodePudding user response：

Page is the type of the parameter. You have to give the value, not the Type. You should use it like this:

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

CodePudding user response：

You must assign a value to showThisPage in your preview, so replace this:

SwitchView(viewRouter: ViewRouter(), showThisPage: Page)

with:

SwitchView(viewRouter: ViewRouter(), showThisPage: Page.login) //or Page.register

Besides, you're not using showThisPage in your code.