Implementing a delete feature on a list in SwiftUI

Question

I followed this document (and this one) to add a delete feature to my list in an app using SwiftUI. Both pages say that once you add the .onDelete(perform: ...) piece of code you will be able to swipe and get a Delete button. Nevertheless this is not what I see. The code compiles but I see nothing on swipe.

My list is backed up by code like this:

@FetchRequest(
    entity: ...,
    sortDescriptors: []
) var myList: FetchedResults<MyEntity>

and not by @State. Could this be an issue?

Below follows more of the relevant code, in case this may be useful:

private func deleteSpot(at index: IndexSet) {
    print(#function)
}

.........

var body: some View {
    VStack {
        ForEach(self.myList, id: \.self.name) { item in
            HStack {
                Spacer()
                Button(action: {
                    self.showingDestinList.toggle()
                    .....
                    UserDefaults.standard.set(item.name!, forKey: "LocSpot")
                }) {
                    item.name.map(Text.init)
                        .font(.largeTitle)
                        .foregroundColor(.secondary)
                }
                Spacer()
            }
        }.onDelete(perform: deleteSpot)
    }

@Asperi, I just added some relevant code in the post, hoping this may be of some use. — Michel
– Michel, Commented Jul 23, 2020 at 3:27

Asperi · Accepted Answer · 2020-07-23 04:42:53Z

2

The delete on swipe for dynamic container works only in List, so make

var body: some View {
    List {              // << here !!
        ForEach(self.myList, id: \.self.name) { item in
            HStack {

              // ... other code

            }
        }.onDelete(perform: deleteSpot)
    }
}

answered Jul 23, 2020 at 4:42

Asperi

262k28 gold badges594 silver badges889 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Michel Over a year ago

Yes. Indeed you are right. I just found the same answer after losing quite a bit of time. Thanks.

Michel · Accepted Answer · 2020-07-23 05:23:01Z

By searching and trying various options, I ended up by finding the issue. I find the solution somewhat ridiculous, but to avoid other people to lose time, here it is:

The last part of the code in the post needs to be modified like the following in order to work.

var body: some View {
    VStack {
      List {
        ForEach(self.myList, id: \.self.name) { item in
            HStack {
                Spacer()
                Button(action: {
                    self.showingDestinList.toggle()
                    .....
                    UserDefaults.standard.set(item.name!, forKey: "LocSpot")
                }) {
                    item.name.map(Text.init)
                        .font(.largeTitle)
                        .foregroundColor(.secondary)
                }
                Spacer()
            }
        }.onDelete(perform: deleteSpot)
      }
    }

Collectives™ on Stack Overflow

Implementing a delete feature on a list in SwiftUI

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related