class initializers swift , make a vector as optional - swift

Question

I'm trying to give the option to the user in my app to divide the data in a custom folder.
I have created the following model describing the folder:
class FolderModel : Identifiable , Codable{
var nameFolder : String
var vectorData : [GenAirportModel]
init(nameFolder: String, vectorData: [GenAirportModel] ) {
self.nameFolder = nameFolder
self.vectorData = vectorData
}
}
with the following function via a textfield I add the new folder
func newFolder(name: String) {
let newFolder: FolderModel = FolderModel(nameFolder: name, vectorData: [basicAirport])
folderVector.append(newFolder)
salva()
}
The issue is, every time the user creates a new folder, the function above put inside vectorData a basic airport.
Unfortunately when the user creates the folder not yet decide what to put inside vectorData I would like that vector data be optional or empty when the user creates the new folder.
I have tried this:
class FolderModel : Identifiable , Codable{
var nameFolder : String
var vectorData : [GenAirportModel]?
init(nameFolder: String, vectorData: [GenAirportModel]? = [] ) {
self.nameFolder = nameFolder
self.vectorData = vectorData
}
}
and in the view that list the data I put this:
VStack{
if addFolder {
ADDFolder(fm: self.fm, isDiplayed: $addFolder)
}
NavigationView{
List {
ForEach(self.fm.folderVector) { folder in
NavigationLink(destination:
VStack{
if folder.vectorData!.isEmpty {
Text("no data")
} else {
List {
ForEach(folder.vectorData!) { item in
Text(item.airportData.aptICAO)
}
}
}
//
}
) {
HStack{
Image(systemName: "folder")
Text(folder.nameFolder)
}
}
}
}.navigationBarTitle(Text("Folder List"), displayMode: .large)
.navigationBarItems(trailing:
Button(action: {
self.addFolder.toggle()
}, label: {
Image(systemName: "plus")
})
)
}
}
But app crashes when I try to list because it found the empty vector.
How can I create the optional vectorData, the user append that data after it create the folder name.
thanks

Answer 1

I assume it is here
if folder.vectorData != nil { // << check explicitly for nil
Text("no data")
} else {
List {
ForEach(folder.vectorData!) { item in
Text(item.airportData.aptICAO)
}
}
}