CoreData not updating Property

Question

Created May ’21

Replies 1

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Participants 2

I have created a project with CoreData having One to Many Relationship (1 Category to many Items). I am having problems updating the Item's 'done' property in Item's View it's updating only when i go back to Category View and then navigate back to Item View

Code Block var body: some View {
      List {
        ForEach(category!.CitemsArray) { item in
              HStack {
                  Text("\(item.title!)")
                                 .onTapGesture {
                                   item.done.toggle()
                           do {
                               try moc.save()
                            } catch {
             print("error saving done value:\(error)")
                            }
                        }
                                Spacer()
              if item.done == true {
         Image(systemName: "checkmark.circle.fill")
                                } else {
          Image(systemName: "circlebadge")
                                }
                          }
                    }
                .onDelete(perform: deleteItems)
            }
            .sheet(isPresented: $isPresented, content: {
  ItemEditView(category: category, item: ItemModel())
            })
            .navigationBarItems(trailing: Button(action: {
                isPresented.toggle()
            }, label: {
                Image(systemName: "plus")
            }))
            .navigationBarTitle(category!.name!)
    }

I think i am doing something wrong in the .onTapGesture

Thanks in Advance

Boost

Answer 1

DelawareMathGuy OP

May ’21

Accepted Answer

hi,

we do not see the definition of category in this view, but i am hoping that it would ideally be

Code Block @ObservedObject var category: Category // not an optional, so reference category.CitemsArray in the ForEach

you should know that changing a property of one of the category's associated items is not seen as a change to the category object itself, and it will not trigger a visual update of the view.

when you do item.done.toggle() in the .onTapGesture, consider registering an explicit change on the category object with

Code Block category.objectWillChange.send()

hope that helps,
DMG

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