How to publish changes to a single object in a object array - swiftui

Question

I have the following classes
class ListItem: Identifiable {
var id: UUID
var name: String
var description: String
var isFavorite: Bool
var debugDescription: String {
return "Name: \(self.name) | Favorite?: \(self.isFavorite)"
}
public init(name: String) {
self.name = name
id = UUID()
self.description = "Some text describing why \(self.name.lowercased()) is awesome"
self.isFavorite = false
}
}
class ListItems: ObservableObject {
#Published var items: [ListItem]
let defaultAnimals = ["Ant", "Bear", "Cat", "Dog", "Elephant",
"Fish", "Giraffe", "Hyena", "Iguana", "Jackal", "Kingfisher", "Leopard", "Monkey"]
public init(animals: [String] = []) {
let animalList: [String] = animals.count > 0 ? animals : defaultAnimals
self.items = animalList.sorted {
$0.lowercased() < $1.lowercased()
}.map {
ListItem(name: $0.firstUppercased)
}
}
}
and the following image view in ContentView
struct ContentView: View {
#ObservedObject var list: ListItems = ListItems()
var body: some View {
List(list.items) {
animal in HStack {
// ...
Image(systemName: animal.isFavorite ? "heart.fill" : "heart").foregroundColor(.pink).onTapGesture {
let index = self.list.items.firstIndex { $0.id == animal.id } ?? -1
if (index >= 0) {
self.list.items[index].isFavorite = !animal.isFavorite
self.list.items = Array(self.list.items[0...self.list.items.count-1]) // <--
}
}
// ...
}
}
}
}
Everytime, the image view is tapped, I am basically reassigning the entire array like this so that the changes can be reflected in the UI
self.list.items = Array(self.list.items[0...self.list.items.count-1])
My question: How can I refactor my code to prevent reassigning the entire object array every time some object property changes?
I am fairly new to Swift & iOS development, not sure if I am missing something basic.

Answer 1

Declare ListItem as an struct instead of a class, this way the view will be notified when isFavorite changes. And just a little suggestion; you can use toggle to change the value of a boolean: self.list.items[index].isFavorite.toggle()