Should I build everything in one view and hide/show elements as they're needed?这实际上取决于您的应用程序的复杂性。对于一个小应用程序来说，将所有内容都构建到一个视图中可能是合适的，但是当有复杂的交换和导航时，它可能不是一个好的选择。

然而它可以做到，请参阅示例代码来回答您的问题How navigate views without using NavigationStack/Link?

I'm wondering if I'm not supposed to build separate views for each new screen.是的，这是一个好主意，它更加模块化，并且在一个视图中可以放入多少内容方面存在限制。

struct OverView: View {
    @State private var viewSelect = "Main"
    
    var body: some View {
        HStack {
            Picker("Select", selection: $viewSelect) {
                ForEach(["Fight", "Skills", "Inventory", "Shop", "Main"], id: \.self) {
                    Text($0)
                }
            }.pickerStyle(.segmented)
        }
        ZStack {
            switch viewSelect {
                case "Fight": Text("Fight view")  // <--- simulated FightView
                case "Skills": Text("Skills view")
                case "Inventory": Text("Inventory view")
                case "Shop": Text("Shop view")
                default: Text("Main view")
            }
        }
        Spacer()
    }
}