Setting a default value for an NSManagedObject in SwiftUI Picker? - swiftui

Question

I'm working with Picker in SwiftUI to choose from a list of Core Data NSManagedObjects, and can't get the picker to display a default value. It also won't set a new value after one is chosen. Is there a way to have a default value for the picker to display?
Here's where the properties for my NSManagedObject are set up.
extension Company {
#nonobjc public class func fetchRequest() -> NSFetchRequest<Company> {
return NSFetchRequest<Company>(entityName: "Company")
}
#NSManaged public var id: UUID?
#NSManaged public var name: String?
#NSManaged public var companyContacts: NSSet?
#NSManaged public var companyRoles: NSSet?
//...
}
And here's where I'm trying to use it.
struct AddRoleSheet: View {
#Environment(\.managedObjectContext) var moc
#FetchRequest(
entity: Company.entity(),
sortDescriptors: [
NSSortDescriptor(keyPath: \Company.name, ascending: true)
]
) var companies: FetchedResults<Company>
//...
#State var company: Company? = // Can I put something here? Would this solve my problem?
//...
var body: some View {
NavigationView {
Form {
Section {
Picker(selection: $company, label: Text("Company")) {
List {
ForEach(companies, id: \.self) { company in
company.name.map(Text.init)
}
}
}
//...
}
}
//...
}
}

Answer 1

There is no fetched results on View.init phase yet, so try the following
#State var company: Company? = nil // << just initialize
//...
var body: some View {
NavigationView {
Form {
Section {
Picker(selection: $company, label: Text("Company")) {
List {
ForEach(companies, id: \.self) { company in
company.name.map(Text.init)
}
}
}
//...
}
}
}.onAppear {
// here companies already fetched from database
self.company = self.companies.first // << assign any needed
}
}