Enable and Disable SwiftUI List rows deletion on a specific row

We can easily enable List row deletion in SwiftUI by attaching .onDelete modifier to the list content.

struct ContentView: View {
    @State private var contacts = [...]
    
    var body: some View {
        NavigationView {
            List {
                ForEach(contacts) { contact in
                    Text(contact.name)
                }.onDelete { indexSet in
                    contacts.remove(atOffsets: indexSet)
                }
            }
            .toolbar {
                EditButton()
            }
        }
    }
}

This will enable item deletion on every row. If you want to disable item deletion on some rows, you can do that by using deleteDisabled(_:) on that particular row.

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How to disable item deletion on a specific row

To disable item deletion on a particular row, you might want to add a new property in your data model.

In this case, I have a readOnly flag in my model to indicate that it can't be deleted.

struct Contact: Identifiable {
    let id = UUID()
    let name: String
    let readOnly: Bool
}

Then mark the item that you want to disable item deletion by setting readOnly to true.

@State private var contacts = [
    Contact(name: "John", readOnly: false),
    Contact(name: "Alice", readOnly: true),
    Contact(name: "Bob", readOnly: true),
    Contact(name: "Foo", readOnly: false),
    Contact(name: "Bar", readOnly: false)
]

Then inside each row, you use that readOnly flag to set .deleteDisabled(contact.readOnly) modifier.

struct ContentView: View {
    @State private var contacts = [
        Contact(name: "John", readOnly: false),
        Contact(name: "Alice", readOnly: true),
        Contact(name: "Bob", readOnly: true),
        Contact(name: "Foo", readOnly: false),
        Contact(name: "Bar", readOnly: false)
    ]
  
    var body: some View {
        NavigationView {
            List {
                ForEach(contacts) { contact in
                    Text(contact.name)
                        .deleteDisabled(contact.readOnly)
                }.onDelete { indexSet in
                    contacts.remove(atOffsets: indexSet)
                }
            }
            .toolbar {
                EditButton()
            }
        }
    }
}

Rerun the app, and the rows with .deleteDisabled set to true won't have a deletion UI.