How to make 'Published<[String]>.Publisher' conform to 'RandomAccessCollection' - xcode

Question

I am trying to make a view that updates based on if the user toggles the favorite button or not. I want the entire view to reconstruct in order to display an array of values whenever that array of values is changed. Inside the view, a for each loop should display every value in the array.
The view that I want to update every time savedArray is changed is FavView. But when I try to use a foreach loop to display every value is savedArray(which I created as a #Published so the view would reconstruct), it gives me the error Generic struct 'ForEach' requires that 'Published<[String]>.Publisher' conform to 'RandomAccessCollection'. I am confused because I thought that String arrays were able to be used in for each loops. Is this not true? How do I loop through a #Published array? Thank you!
This is my code for the savedArray(in ViewModel) and the FavView I want to display it in with the for each.
struct ContentView: View {
#StateObject private var statNavManager = StatsNavigationManager()
#State private var saved: [String] = []
var body: some View {
TabView {
StatsView(saved: $saved)
.tabItem {
Label("Home", systemImage: "house")
}
FavView(saved: $saved)
.tabItem {
Label("Saved", systemImage: "bookmark")
}
}
.environmentObject(statNavManager)
}
}
final class ViewModel: ObservableObject {
#Published var items = [Item]()
#Published var showingFavs = true
#Published var savedItems: Set<String> = []
#Published var savedArray: [String]
// Filter saved items
var filteredItems: [String] {
//return self.items
return savedArray
}
var db = Database()
init() {
self.savedItems = db.load()
self.items = db.returnList()//the items
self.savedArray = Array(db.load())
print("savedarray", savedArray)
print("important!", self.savedItems, self.items)
}
func contains(_ item: Item) -> Bool {
savedItems.contains(item.id)
}
// Toggle saved items
func toggleFav(item: Item) {
print("Toggled!", item)
if contains(item) {
savedItems.remove(item.id)
if let index = savedArray.firstIndex(of: item.id) {
savedArray.remove(at: index)
}
} else {
savedItems.insert(item.id)
savedArray.append(item.id)
}
db.save(items: savedItems)
}
}
struct FavView: View {
#StateObject private var vm = ViewModel()
var body: some View {
VStack {
List {
var x = print("testing",vm.savedArray)//this only prints once at the start
ForEach($vm.savedArray, id: \.self) { string in
let item = vm.db.returnItem(input: string.wrappedValue)
HStack {
VStack(alignment: .leading) {
Text(item.title)
.font(.headline)
Text(item.description)
.font(.subheadline)
}
Spacer()
Image(systemName: vm.contains(item) ? "bookmark.fill" : "bookmark")
.foregroundColor(.blue)
.onTapGesture {
vm.toggleFav(item: item)
}
}
}
}
.cornerRadius(10)
}
}
}

Answer 1

in ForEach, you are using $ symbol to access savedArray you have to use the vm itself
struct FavView: View {
#StateObject private var vm = ViewModel()
var body: some View {
VStack {
List {
ForEach($vm.savedArray, id: \.self) { string in //< here $vm.savedArray not vm.$savedArray
let item = vm.db.returnItem(input: string)
HStack {
VStack(alignment: .leading) {
Text(item.title)
.font(.headline)
Text(item.description)
.font(.subheadline)
}
Spacer()
Image(systemName: vm.contains(item) ? "bookmark.fill" : "bookmark")
.foregroundColor(.blue)
.onTapGesture {
vm.toggleFav(item: item)
}
}
}
}
.cornerRadius(10)
}
}
}
this should work.