SwiftUI segmented picker default state as nil - ios

Question

I'm using a segmented picker in a form to answer simple "Yes" and "No" questions. Can the segmented picker initial state be set to nil so that neither yes or no is highlighted/selected on appear?
#State private var equipmentCheck = 0
private var answers = ["Yes", "No"]
var body: some View {
NavigationView {
Form {
Section(header: Text("Questions")) {
Text("Have the plant and equipment been checked?")
Picker("", selection: $equipmentCheck) {
ForEach(0 ..< answers.count, id: \.self) {
Text("\(self.answers[$0])")
}
}
.pickerStyle(SegmentedPickerStyle())
.padding()
}
}
}
}

Answer 1

Here is a possible approach. Tested & worked with Xcode 11.4 / iOS 13.4
#State private var equipmentCheck: Int? // << here !!
private var answers = ["Yes", "No"]
var body: some View {
NavigationView {
Form {
Section(header: Text("Questions")) {
Text("Have the plant and equipment been checked?")
Picker("", selection: $equipmentCheck) {
ForEach(0 ..< answers.count, id: \.self) {
Text("\(self.answers[$0])")
.tag(Optional($0)) // << here !!
}
}
.pickerStyle(SegmentedPickerStyle())
.padding()
}
}
}
}

Answer 2

It seems that if you set the selected value to an index that is not in your segmented control, then none of the values are highlighted.
For example:
#State private var equipmentCheck = -1
works.
I’m looking for documentation that confirms that this is guaranteed to work, but have found none.
The documentation for selectedSegmentIndex of UIKit’s UISegmentedControl says to set the value to -1 to remove the selection, so it seems reasonable to do so here as well.