重用凭据访问其他视图

Question

我已经开始努力使用SwiftUI将本机IOS应用程序替换为Web应用程序，或者至少与Web应用程序一起使用。

将脚趾浸入水中并在此处使用代码形式的答案后，我已经能够成功创建一个登录屏幕，该登录屏幕通过url连接到API并返回JSON。成功登录后，我便可以进行身份​​验证并进入下一个视图。这就是我现在停留的地方，很可能是由于我要处理的信息量大和/或经验不足。

登录后，我需要显示一个菜单。该菜单将取决于用户有权访问的内容。我已经编写了API，并且可以正常工作。我不理解并且遇到麻烦的是如何进行下一个API调用。

BaseView.swift

import SwiftUI

struct BaseView : View {

    @EnvironmentObject var viewRouter: ViewRouter

    var body: some View {
        VStack {
            if viewRouter.currentPage == "view1" {
                FirstView()
            } else if viewRouter.currentPage == "view2" {
                SecondView()
                    .transition(.scale)
            }
        }
    } }

#if DEBUG struct MotherView_Previews : PreviewProvider {
    static var previews: some View {
        BaseView().environmentObject(ViewRouter())
    } }
#endif

ViewRouter.swift

import Foundation
import Combine
import SwiftUI

class ViewRouter: ObservableObject {

    let objectWillChange = PassthroughSubject<ViewRouter,Never>()

    var currentPage: String = "view1" {
        didSet {
            withAnimation() {
                objectWillChange.send(self)
            }
        }
    }
}

FirstView.swift

import SwiftUI

struct FirstView : View {

    @EnvironmentObject var viewRouter: ViewRouter


          @State var username: String = ""
            @State var password: String = ""
            @State var authenticationDidFail: Bool = false
            @State var authenticationDidSucceed: Bool = false
            @State var selection: Bool = false


          @ObservedObject var manager = HttpAuth()


            var body: some View {
                NavigationView{
                        ZStack{
                                VStack {
                    WelcomeText()
                    UsernameTextField(username: $username)
                    PasswordSecureField(password: $password)

                    if authenticationDidFail {
                        Text("Information not correct. Try again.")
                            .offset(y: -10)
                            .foregroundColor(.red)

                    }
                                    NavigationLink(destination: SecondView(), isActive: self.$selection){
                                            EmptyView()
                                    }
                                   Button(action: {
                        self.manager.postAuth(username: self.username, password: self.password)
                                    self.viewRouter.currentPage = "view2"

                    }) {
                       LoginButtonContent()
                    }
                }
                .padding()
                   /* if authenticationDidSucceed {
                        Text("Login succeeded!")
                            .font(.headline)
                            .frame(width: 250, height: 80)
                            .background(Color.green)
                            .cornerRadius(20.0)
                            .foregroundColor(.white)
                            .animation(Animation.default)

                    }*/
                     if self.manager.authenticated{
                                   Text("Logged in!")
                                   //.font(.headline)
                                   .frame(width: 250, height: 80)
                                   .background(Color.green)
                                   .foregroundColor(.white)
                                   .animation(Animation.default)
                           //NextButtonContent()
                        SecondView()

                            }
                }
        }
    }
}




#if DEBUG
struct FirstView_Previews : PreviewProvider {
    static var previews: some View {
        FirstView().environmentObject(ViewRouter())
    }
}
#endif

struct NextButtonContent : View {
    var body: some View {
        return Text("Next")
            .foregroundColor(.white)
            .frame(width: 200, height: 50)
            .background(Color.blue)
            .cornerRadius(15)
            .padding(.top, 50)
    }
}

struct EmptyView : View {
    var body: some View {
            Text("")
    }

}

SecondView.swift

import SwiftUI

struct SecondView : View {


    @EnvironmentObject var viewRouter: ViewRouter


    @ObservedObject var manager = HttpAuth()

    var body: some View {



        VStack {
            Spacer(minLength: 50.0)
            Text("Hello")
          Button(action: {self.viewRouter.currentPage = "view1"
           // self.manager.postMenu(username: self.username, password: self.password)
           }) {
             BackButtonContent()



             }
        }
    }
}

#if DEBUG
struct SecondView_Previews : PreviewProvider {
     static var previews: some View {
        SecondView().environmentObject(ViewRouter())
    }
}
#endif

struct BackButtonContent : View {
    var body: some View {
        return Text("Back")
            .foregroundColor(.white)
            .frame(width: 200, height: 50)
            .background(Color.blue)
            .cornerRadius(15)
            .padding(.top, 50)
    }
}

在SecondView.swift上，我尝试通过使用Binding（@Binding var username：String）进行声明来重用用户名和密码变量，但是随后我发现到处都是错误，包括SecondView.type不可转换。

我在这里走错了路吗？还是需要将这些变量存储在EnvironmentObject中？

SecondView应该通过HttpAuth类下的postMenu进行API调用（您可以在其中看到注释），然后返回JSON（我假定为列表）。这是我要问的问题，如何将这些变量重用于其他视图/调用，然后在以后使用？