SwiftUI：如何在关闭第一个工作表时显示第二个工作表

.fullScreenCover当用户登录并按下 MyGarage 按钮时，我想创建一个带有 的侧边菜单。该.fullScreenCover会解散，主视图将导航到MyGarage查看。但如果用户未登录，.fullScreenCover则将关闭并.fullScreenCover出现一个 loginView 。我的问题是，.fullScreenCover如果我将 2 个相同的内容.fullScreenCover放在主视图中，它将无法工作。有没有办法解决这个问题？对不起，我有点难以解释。

这是代码

侧边菜单视图

struct SideMenuView: View {
    @Environment(\.presentationMode) var presentationMode
    @Binding var showMyGarage: Bool
    @Binding var showSignIn: Bool
    var user = 0 //If user is 1, it is logged in
    var body: some View {
        NavigationView{
            VStack{
                Button(action: {
                    presentationMode.wrappedValue.dismiss()
                    if user == 1 {
                        self.showMyGarage = true
                    }else{
                        self.showSignIn = true
                    }
                }, label: {
                    Text("My Garage")
                })
            }
            .navigationBarTitleDisplayMode(.inline)
            .navigationBarItems(leading:
                                    HStack(spacing: 20){
                                        Button(action: {
                                            presentationMode.wrappedValue.dismiss()
                                        }, label: {
                                            Text("X")
                                        })
                                        Text("Main Menu")
                                    }
                )
        }.navigationViewStyle(StackNavigationViewStyle())
    }
}

主视图

struct HomeView: View {
    @State var showSideMenu = false
    @State private var showMyGarage = false
    @State var showSignIn = false

    var body: some View {
        VStack{

            Text("Home")
            
            NavigationLink(destination: MyGarageView(showMyGarage: $showMyGarage), isActive: $showMyGarage){
                EmptyView()
            }
            
        }
        .navigationBarItems(leading:
                                Button(action: {
                                    self.showSideMenu.toggle()
                                }, label: {
                                    Text("Menu")
                                })
            )
        .fullScreenCover(isPresented: $showSideMenu, content: {
            SideMenuView(showMyGarage: $showMyGarage, showSignIn: $showSignIn)
        })
        .fullScreenCover(isPresented: $showSignIn, content: {
            SignInView()
        })

    }
}

struct MyGarageView: View {
    @Binding var showMyGarage: Bool
    var body: some View {
        Text("MyGarage")
    }
}

struct SignInView: View {
    var body: some View {
        Text("Sign In")
    }
}