SwiftUI: How to present view when clicking on a button?

Question

I\'m trying to make an app using Apple\'s SwiftUI and I need to have two buttons that present two different views in a single List row.

Answer 1

improved version. (Swift, iOS 13 beta 4)

class NavigationModel : BindableObject {
    var willChange = PassthroughSubject()
    var presentedData: String? {
        didSet {
            willChange.send()
        }
    }
    func dismiss() { if presentedData != nil {
        presentedData = nil
    } }
}

struct ContentView: View {
    var body: some View {
        NavigationView {
            MasterView()
        }.environmentObject(NavigationModel())
    }
}

struct MasterView: View {

    @EnvironmentObject
    var navigationModel: NavigationModel
    var destinationLink = DynamicNavigationDestinationLink(id: \.self) { data in DetailView(data: data) }

    var body: some View {
        List(0..<10) { index in
            Button("I am root. Tap for more details of #\(index).") {
                self.navigationModel.presentedData = "#\(index)"
            }
        }
        .navigationBarTitle("Master")
        .onReceive(navigationModel.willChange) {
            self.destinationLink.presentedData?.value = self.navigationModel.presentedData
        }
    }
}

struct DetailView: View {
    @EnvironmentObject
    var model: NavigationModel

    let data: String

    var body: some View {
        Button("Here are details of \(data). Tap to go back.") {
            self.model.dismiss()
        }
        .navigationBarTitle("Detail \(data)")
    }
}

struct Empty : Hashable {
}


#if DEBUG
struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}
#endif