SwiftUI navigate if ObservedObject property changes - swift

Question

I can't for the life of me figure out how to only navigate if a property from my ObservedObject changes to meet a condition. ie when my state changes to some condition, navigate to the next screen.
I've used the tag and selection initializer on the NavigationLink but it selection requires a Binding, and I can't derive a Binding from the properties on my ObservedObject without using the .constant() initializer on Binding which is only an immutable value.
#ObservedObject var store: Store<AppState, AppValue>
NavigationLink(
destination: SecondView(),
tag: true,
selection: store.shouldNavigate // Can't do this because I need a binding
)
How else are people implementing buttons that only navigate if a condition in their state is met? I'm trying to avoid using the #State because I want the navigation to depend on my app state not on a local state that I'm toggling based on some business logic
public final class Store<Value, Action>: ObservableObject {
#Published public private(set) var value: Value
}
UPDATE:
So it looks like I should be able to create a binding but since store.value gives me Binding<Value> I get an error: Generic parameter Subject cannot be inferred.

Answer 1

just remove private(set) in your model, NavigationLink will set shouldNavigate to false after navigation is completed, so it should not be private(set)
public final class Store<Value, Action>: ObservableObject {
#Published public var value: Value
}

Answer 2

I show you an important intermediate solution before generics. I think the key here is that selection binding requires optional binding. That's most hassles coming from.
enum AppState: String{
case none = "none"
case red = "red"
case blue = "blue"
case green = "green"
case purple = "purple"
}
enum AppValue: String{
case none
}
public final class Store<V, A>: ObservableObject {
#Published var value: AppState? = AppState.none
public var link :Color = Color.white
init(value: AppState = .none, link : Color = Color.white){
self.link = link
self.value = value
}
}
struct TestView: View {
#ObservedObject var store: Store<AppState?, AppValue>
var viewStates: [Store<AppState?,AppValue>] =
[Store(value: .red, link: Color.red),
Store(value: .blue, link: Color.blue) ,
Store(value: .green, link: Color.green),
Store(value: .purple, link: Color.purple) ]
var body: some View {
NavigationView{
VStack{
ForEach(viewStates, id: \.value){ s in
Group{
NavigationLink(destination: s.link, tag: s.value!, selection: self.$store.value ){EmptyView()}
Button( s.value!.rawValue, action: {
self.store.value = s.value!})
}}
}
}
}
}