Trouble Passing Data From Form Entry - swiftui

Question

This is a module where the user enters transaction data and then it is saved to coreData. EntryView calls getFormData for entry of form data then calls the function saveButton() for saving the data to coreData.
Things have been working great until I recently added two additional parameters gotCountry and gotHome. These parameters are defined in EntryView. The data I want is found in getFormData but I don't want to make it available to other parts of the app until the save button is pressed (func saveButton()) hence I need to pass the data from getFormData to saveButton().
One of the two warnings is Initialization of immutable value 'gotCountry' was never used; consider replacing with assignment to '_' or removing it if I place let in front of the parameters gotCountry and gotHome in getFormData. These are variables so shouldn't have let in front of them. Removing 'let' results in the error Type '()' cannot conform to 'View'
The parameters entryDT and entryPT are coming from form input data while gotCountry and gotHome are coming from calculated data available at time of entry.
Note that I have stripped out some of the code to see the passing of data better.
struct EntryView: View {
#EnvironmentObject var ctTotals: CountryTotals
#State private var entryDT = Date()
#State private var entryPT: Int = 0
#State private var gotCountry: String = ""
#State private var gotHome: Double = 0.0
var body: some View {
VStack (alignment: .leading){
ShowTabTitle(g: g, title: "Enter Transaction")
getFormData(entryDT: $entryDT, entryPT: $entryPT, gotCountry: $gotCountry, gotHome: $gotHome)
Button {
self.saveButton() // button pressed
} label: {
Text ("Save")
}
}
}
func saveButton() {
// save entry to core data
let newEntry = CurrTrans(context: viewContext)
// entry id
newEntry.id = UUID()
// entry date
newEntry.entryDT = entryDT
// entry payment type
newEntry.entryPT = Int64(entryPT)
ctTotals.sendTotals(gotCountry: gotCountry, gotHome: gotHome)
do {
try viewContext.save()
} catch {
}
// reset parameters for next entry
self.entryDT = Date()
self.entryPT = 0
}
}
struct getFormData: View {
#Binding var entryDT: Date
#Binding var entryPT: Int
#Binding var gotCountry: String
#Binding var gotHome: Double
var body: some View {
// get entry date and time
DatePicker("", selection: $entryDT, in: ...Date())
// select payment type
Picker(selection: $entryPT, label: Text("")) {}
// copy data to totals by country
gotCountry = currencies.curItem[userData.entryCur].cunName
gotHome = totalValue
}
}
struct CtModel: Codable, Identifiable, Hashable {
var id = UUID()
var ctName: String
var ctHome: Double
}
class CountryTotals: ObservableObject {
#Published var ctItem: [CtModel] {
didSet {
if let encoded = try? JSONEncoder().encode(ctItem) {
UserDefaults.standard.set(encoded, forKey: StorageKeys.ctTotals.rawValue)
}
}
}
init() {
}
func sendTotals(gotCountry: String, gotHome: Double) -> () {
let item = CtModel(ctName: gotCountry, ctHome: gotHome)
ctItem.append(item)
}
}