How to let users delete rows from a list

Paul Hudson @twostraws September 18th 2019

Updated for Xcode 12.0

SwiftUI makes it easy to let users swipe to delete rows by attaching an onDelete(perform:) handler to some or all of your data. This handler needs to have a specific signature that accepts multiples indexes to delete, like this:

func delete(at offsets: IndexSet) {

Inside there you will usually want to call Swift’s remove(atOffsets:) method to delete the requested rows from your sequence. Because SwiftUI is watching your state, any changes you make will automatically be reflected in your UI.

For example, this code creates a ContentView struct with a list of three items, then attaches an onDelete(perform:) modifier that removes any item from the list:

struct ContentView: View {
    @State private var users = ["Paul", "Taylor", "Adele"]

    var body: some View {
        NavigationView {
            List {
                ForEach(users, id: \.self) { user in
                    Text(user)
                }
                .onDelete(perform: delete)
            }
        }
    }

    func delete(at offsets: IndexSet) {
        users.remove(atOffsets: offsets)
    }
}

If you run that code you’ll find you can swipe to delete any row in the list.