SwiftUI: NavigationLinks dependent on Toggle states - swiftui

Question

I am trying to create a NavigationLink destination that changes if any one of several toggle switches are set to TRUE. I have worked out the if/then logic for the links using tags and a state variable. That is, if I manually set toggleCount = the links work correctly.
What I would like to do however, is set toggleCount = Number of True Switches. You can see my failed attempt to loop through the array and increment toggleCount. It fails because it does not conform to View.
Any advice on a clean way to implement this? I don't necessarily need to count the number of true switches, I just need to know if any one of them were set to true.
import SwiftUI
struct ToggleStruct : Identifiable {
var id : Int
var name : String
var position : Bool
}
struct ContentView: View {
#State var toggleArray = [ToggleStruct(id: 1, name: "Toggle 1", position: false),
ToggleStruct(id: 2, name: "Toggle 2", position: false),
ToggleStruct(id: 3, name: "Toggle 3", position: false)
]
#State private var selection: Int? = nil
var toggleCount = 0
var body: some View {
NavigationView {
VStack {
Text("Toggle Count: \(toggleCount)")
ForEach(0..<toggleArray.count) { i in
Toggle(isOn: $toggleArray[i].position, label: {
Text(toggleArray[i].name)
})
}
NavigationLink(
destination: Text("Destination A"),
tag: 1,
selection: $selection,
label: {EmptyView()})
NavigationLink(
destination: Text("Destination B"),
tag: 2,
selection: $selection,
label: {EmptyView()})
Button(action: {
// ForEach(0..<toggleArray.count) { x in
// if toggleArray[x].position {
// toggleCount += 1
// }
// }
if toggleCount > 0 {
selection = 1
} else {
selection = 2
}
}, label: {
Text("Continue")
})
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}

Answer 1

Would something like this work for you? You could change the logic in destinationView to be whatever you needed.
import SwiftUI
struct ContentView: View {
#State var toggleOneIsOn = false
#State var toggleTwoIsOn = false
#State var toggleThreeIsOn = false
var body: some View {
NavigationView {
Form {
Toggle("Toggle One", isOn: $toggleOneIsOn)
Toggle("Toggle Two", isOn: $toggleTwoIsOn)
Toggle("Toggle Three", isOn: $toggleThreeIsOn)
NavigationLink("Foo", destination: destinationView)
}
}
}
var destinationView: some View {
switch (toggleOneIsOn, toggleTwoIsOn, toggleThreeIsOn) {
case _ where toggleOneIsOn || toggleTwoIsOn || toggleThreeIsOn:
return Text("At least one toggle is on")
default:
return Text("All toggles are off")
}
}
}