I am new to swiftui and learning it.
I have a situation where I have to define an array of an object(let say the object is USER, so an array of Object will be "[USER]") inside the observable object. This observable object is a ViewModel. There is an API call in any other view which initialize this ViewModel.
I have to initialize this [User] object only after this ViewModel will be initialized. I have to do take this [USER] inside the ViewModel because this object [USER] will be modified by TextField on other views.
I am unable to initialize this [USER] object after the API call response because of several compile-time errors.
struct User: Identifiable {
var profileName: String = ""
var profileId: String = ""
var firstname: String = ""
var lastname: String = ""
}
class ViewModel: ObservableObject {
@Published var document: Document?
@Published var users = [User]()
var idValue: String
init (idValue: String) {
idValue = idValue
}
func getDetails() {
APIService.shared.getDocumentDetails(idValue: idValue) { document in
DispatchQueue.main.async {
self.document = document
self.setEndUserValues()
}
}
}
func setEndUserValues() {
var users = [User]()
if let document = document, let subjects = document.subjects {
ForEach(0..<subjects.count, id: \.self) { index in
let profile = subjects[index]
var user = User(id: index)
user.profileName = profile.profileName ?? ""
user.profileId = profile.profileId ?? ""
user.firstname = profile.firstname ?? ""
user.lastname = profile.lastname ?? ""
users.append(user)
}
}
}
I am getting Type '()' cannot conform to 'View' error. Also, the response is quite nested, so I have not mentioned more properties. Please help me to achieve this.
You may find that the following code works a bit better than your fixed code:
struct User: Identifiable {
var profileName: String
var id: String // In order to conform to Identifiable, you have to have
// a variable named "id"
var firstName: String // We write Swift variables in camelcase.
var lastName: String // You can even see that these get flagged as a spelling error.
}
class ViewModel: ObservableObject {
@Published var document: Document?
@Published var users = [User]()
var idValue: String
init(idValue: String) { // I am not sure of the purpose of initializing the
// ViewModel with an "id". You shouldn't have multiple
// copies of this in your app.
self.idValue = idValue
}
func getDetails() {
APIService.shared.getDocumentDetails(idValue: idValue) { document in
DispatchQueue.main.async {
self.document = document
self.setEndUserValues()
}
}
}
func setEndUserValues() {
if let document = document, let subjects = document.subjects {
for subject in subjects { // You have an array of Subjects. Use it directly.
// This way of initializing creates your User and appends it to the
// array of Users in one step.
users.append(User(
profileName: subject.profileName,
id: subject.profileId,
firstName: subject.firstname,
lastName: subject.lastname))
}
}
}
}
I want to show some issues in your code for a minute that I fixed above:
func setEndUserValues() {
var users = [User]() // You are creating a local array here. This is not your
// "@Published var users"
if let document = document, let subjects = document.subjects {
for index in 0..<subjects.count { // This becomes unnecessary when you don't
// need the index.
let profile = subjects[index] // This becomes unnecessary.
var user = User(id: index) // According to your User struct, this doesn't
// compile. You don't have an initializer that
// accepts an "id: Int"
user.profileName = profile.profileName ?? ""
user.profileId = profile.profileId ?? ""
user.firstname = profile.firstname ?? ""
user.lastname = profile.lastname ?? ""
users.append(user) // This is your local array of users. This doesn't
// actually go anywhere, and you don't actually
// fill your ViewModel.users array
}
}
}