SwiftUI Loading Data - swift

Question

I am trying to load data from an ObservableObject class when I present a SwiftUI view but I get the following error code: "Cannot use instance member 'documentID' within property initializer; property initializers run before 'self' is available"
Class with the data querying:
class ItemDataDelegate: ObservableObject {
#Published var serviceContentLoaded = Bool()
#Published var SelectedCategory: String?
#Published var SelectedDocumentID: String?
init(SelectedCategory: String, SelectedDocumentID: String){
self.getSelectedContentData(Category: SelectedCategory, DocumentID: SelectedDocumentID) {
self.getSelectedCompanyData(CUID: ContentData[indexPath.row].CompanyID) {
print("data query completed")
}
}
}
}
Here is the View that I want to present when the data from the previous code is called and completed:
The error I mentioned above is shown on the #StateObject var itemDataDelegate = ItemDataDelegate(SelectedCategory: selectedCategory, SelectedDocumentID: documentID) line of code.
struct DetailView: View {
#Binding var documentID: String
#Binding var selectedCategory: String
#StateObject var itemDataDelegate = ItemDataDelegate(SelectedCategory: selectedCategory, SelectedDocumentID: documentID)
#State private var showSheet = false
#Environment(\.presentationMode) var mode: Binding<PresentationMode>
var image: UIImage
var companyName: String
var cartActive: Bool
var body: some View {
return ZStack {
switch itemDataDelegate.serviceContentLoaded {
case true:
ContentView()
case false:
LoadingView()
}
}
.navigationBarHidden(true)
.frame(maxWidth: .infinity, maxHeight: .infinity)
.edgesIgnoringSafeArea(.all)
}
}

Answer 1

Since you need to use one of the passed-in parameters in the initialization of the #StateObject, you'll have to write a custom init for your View. Using your current code, it would look something like this:
struct DetailView: View {
#Binding var documentID: String
#Binding var selectedCategory: String
#StateObject var itemDataDelegate : ItemDataDelegate
#State private var showSheet = false
#Environment(\.presentationMode) var mode: Binding<PresentationMode>
var image: UIImage
var companyName: String
var cartActive: Bool
init(documentID: Binding<String>, selectedCategory: Binding<String>, image: UIImage, companyName: String, cartActive: Bool) {
_documentID = documentID
_selectedCategory = selectedCategory
self.image = image
self.companyName = companyName
self.cartActive = cartActive
_itemDataDelegate = StateObject(wrappedValue: ItemDataDelegate(SelectedCategory: selectedCategory.wrappedValue, SelectedDocumentID: documentID.wrappedValue))
}
var body: some View {
return ZStack {
switch itemDataDelegate.serviceContentLoaded {
case true:
ContentView()
case false:
LoadingView()
}
}
.navigationBarHidden(true)
.frame(maxWidth: .infinity, maxHeight: .infinity)
.edgesIgnoringSafeArea(.all)
}
}