SwiftUI passing Core Data between Views Error

Question

Created Apr ’21

Replies 3

Boosts 0

Views 1.8k

Participants 3

I have a List of Core Data elements I can add. I want to be able to edit them. For that I have an "edit Sheet" View. But when I try editing the element the app crashes and I get the error "Thread 1: "-[Item setTitle:]: unrecognized selector sent to instance 0x600002479a80""
I recreated the error here:

struct ListView: View {

@Environment(\.managedObjectContext) var viewContext

@FetchRequest(sortDescriptors: []) var items: FetchedResults<Item>

@State var showEditItemSheet = false

@State var itemToEdit = Item()

var body: some View {

List {

ForEach(items) { item in

ListItemView(item: item)

.onTapGesture {

itemToEdit = item

showEditItemSheet.toggle()

}

}

}

.sheet(isPresented: $showEditItemSheet, content: {EditItemView(item: itemToEdit, showEditItemSheet: $showEditItemSheet)}

}

}

struct ListItemView: View {

@FetchRequest(sortDescriptors: []) var items: FetchedResults<Item>

@ObservedObject var item: FetchedResults<Item>.Element

var body: some View {

Text(item.title)

}

}

struct EditItemView: View {

@Environment(\.managedObjectContext) var viewContext

@State var item: FetchedResults<Item>.Element

@Binding var showEditItemSheet: Bool

@State var title = ""

var body: some View {

VStack {

TextField("Title", text: $title)

Button(action: {

item.title = title //<- Here I get the error

saveContext()

showEditItemSheet.toggle()

}, label: {Text("Save")})

}

}

private func saveContext() {

do {

try viewContext.save()

} catch {

let error = error as NSError

fatalError("Unresolved Error: \(error)")

}

}

}

Boost

Answer 1

OOPer OP

Apr ’21

Can you try something like this?

Code Block struct ListView: View {
    @Environment(\.managedObjectContext) var viewContext
    @FetchRequest(sortDescriptors: []) var items: FetchedResults<Item>
    @State var showEditItemSheet = false
    @State var itemToEdit: Item?
    var body: some View {
        List {
            ForEach(items) { item in
                ListItemView(item: item)
                    .onTapGesture {
                        itemToEdit = item
                        showEditItemSheet.toggle()
                    }
            }
        }
        .sheet(isPresented: $showEditItemSheet) {
            ListViewSheetContent(item: $itemToEdit, showEditItemSheet: $showEditItemSheet)
        }
    }
}
struct ListViewSheetContent: View {
    @Binding var item: Item?
    @Binding var showEditItemSheet: Bool
    var body: some View {
        EditItemView(item: item!, showEditItemSheet: $showEditItemSheet)
    }
}

0

Answer 2

Hartydev OP

Apr ’21

This worked perfectly fine! Thank you, I was stuck for a while now on this.

0

Answer 3

roroCoder OP

Apr ’21

Can someone please explain how you edit a core data entry/record please. Thank you, I am having lots of trouble figuring it out.

0