How to select in List in SwiftUI

[onmyway133]

Specify optional value for List(selection:).

This keeps selection on macOS, but not on iPad. On iPad each row in the List needs to be NavigationLink, no need for .tag. The selection is not updated, need to manually update with onTapGesture

For List selection to work, make sure

• selection binding type matches. Preferablly using ID than Self
• Need to specify id in ForEach for List to infer tag. Otherwise, need to specify tag for cell

struct Sidebaer: View {
    class ViewModel: ObservableObject {
        @Published var group: BookGroup?
    }

    @StateObject private var vm = ViewModel()

    var body: some View {
        List(selection: $vm.group) {
            allView
            foldersView
            tagsView
        }

Note that

• Double-tap will cancel default List selection
• onDrag will interfere with onInsert and selelction

List(selection: $selectedItem) {
    ForEach(manager.stack.items) { item in
        ItemCell(item: item)
            .onDrag {
                NSItemProvider(object: item.text as NSString)
            }
            .tag(item)
    }
    .onMove { source, destination in
        manager.stack.items.move(fromOffsets: source, toOffset: destination)
    }
    .onDelete { indexSet in
        manager.stack.items.remove(atOffsets: indexSet)
    }
    .onInsert(of: [.text, .url]) { index, itemProviders in
        manager.handleInsert(at: index, itemProviders: itemProviders)
    }
}