SwiftUI 不同目的地的导航栏项目

Question

I have a Navigation View with an Add button(NavigationBarItem) and want to set a different destination of the Navigation Bar item in each tab.

enum Tab: String {
    case income = "Income"
    case expenses = "Expenses"
    case budgets = "Budget"
    case investment = "Investment"
    case assets = "Asset"  
}

I have already tried to give the struct the view as raw value but this is not possible. How can I do this?

var body: some View {
    NavigationView {
        TabView(selection: $selection) {
            Text("Place Holder Income")
                .tabItem {
                    Label("Income", systemImage: "star")
                }
                .tag(Tab.income)
                .navigationBarHidden(false)
            
            ExpensesView()
                .tabItem {
                    Label("Expenses", systemImage: "star")
                }
                .tag(Tab.expenses)
                .navigationBarHidden(false)
            
            Text("Place Holder Budgets")
                .tabItem {
                    Label("Budgets", systemImage: "star")
                }
                .tag(Tab.budgets)
                .navigationBarHidden(false)
            
            Text("Place Holder Investment")
                .tabItem {
                    Label("Investment", systemImage: "star")
                }
                .tag(Tab.investment)
                .navigationBarHidden(false)
            
            Text("Place Holder Assets")
                .tabItem {
                    Label("Assets", systemImage: "star")
                }
                .tag(Tab.assets)
                .navigationBarHidden(false)
    }
        .navigationTitle(selection.rawValue)
        .navigationBarItems(
            trailing:
                NavigationLink("Add", destination: AddExpensesView())
        )
    
    }
}

Answer 1

You could add a function (in your view) that routes to the right destination (depending on the value of the "selection" property).

@ViewBuilder func addView() -> some View {
        switch selection {
        case .income: Text("Income destination")
        case .expenses: Text("Expenses destination")
        default: Rectangle()
        }
    }

Your NavigationLink calls this view builder:

NavigationLink("Add", destination: addView())