I use in iOS app NavigationLink in NavigationView (for supporting iOS 15). NavigationView contains list of some items. I would like to use the same view for adding new items and editing exist (after click on NavigationLink). So I need to pass “PersonEntity” to PersonAddOrEditView. This view has 2 init (one with empty params for “add form” and the second one with “PersonEntity” parameter for initialising form fields).
The problem is that I can’t initialise optional fields (vars). They are staying nil and picker (or selectable list in comment) always “choosing” first value(1). It works if I make @State var age: Int? non-optional.

Thanks in advance for your advices.

import SwiftUI

struct NavigationLinkForm: View {
    var persons: [PersonEntity] = [
        PersonEntity(name: "Person 1", age: 20),
        PersonEntity(name: "Person 2", age: 25),
        PersonEntity(name: "Person 3", age: 30),
    ]
    var body: some View {
        NavigationView {
            VStack {
                NavigationLink("Add new person") {
                    PersonAddOrEditView()
                }
                List {
                    ForEach(persons, id: .self) { person in
                        NavigationLink(person.name) {
                            PersonAddOrEditView(personEntity: person)
                        }
                    }
                }
            }
        }
    }
}

struct PersonEntity: Hashable {
    let name: String
    let age: Int?
}

struct PersonAddOrEditView: View {
    
    let personEntity: PersonEntity?
    
    @State var name: String
    @State var age: Int?
    
    private var isNew: Bool {
        personEntity == nil
    }

    init(personEntity: PersonEntity) {
        self.personEntity = personEntity
        self.name = personEntity.name
        self.age = personEntity.age
    }
    
    init() {
        self.personEntity = nil
        self.name = ""
        self.age = 10
    }
    
    var body: some View {
        VStack {
            List {
                TextField("Name", text: $name)
                
                Picker("Age", selection: $age) {
                    ForEach(1...100, id: .self) { ageItem in
                        Text("(ageItem)")
                            .tag(ageItem)
                            .id(ageItem)
                    }
                }
                .pickerStyle(.menu)
                
//                NavigationLink("(age ?? 0)") {
//                    List(selection: $age) {
//                        ForEach(1...100, id: .self) { ageItem in
//                            Text("(ageItem)")
//                                .tag(ageItem)
//                                .id(ageItem)
//                        }
//                    }
//                }
            }
            if isNew {
                Button("Add") { }
            } else {
                Button("Update") { }
            }
        }
    }
}

#Preview {
    NavigationLinkForm()
}