SwiftUI NavigationLink iOS16所选色调？

Question

我有以下代码：

struct ContentView: View {
    @Environment(\.managedObjectContext) private var viewContext

    @FetchRequest(
        sortDescriptors: [NSSortDescriptor(keyPath: \Item.timestamp, ascending: true)],
        animation: .default)
    private var items: FetchedResults<Item>
    
    @State private var selectedMainItem:Item?

    var body: some View {
        
        NavigationSplitView {
            
            List(selection: $selectedMainItem) {
                ForEach(items) { item in
                    NavigationLink(value: item) {
                        Text("Item  \(item.id.debugDescription)")
                    }
                }
                .onDelete(perform: deleteItems)
            }
            .toolbar {
                ToolbarItem(placement: .navigationBarTrailing) {
                    EditButton()
                }
                ToolbarItem {
                    Button(action: addItem) {
                        Label("Add Item", systemImage: "plus")
                    }
                }
            }

            
        } detail: {
            NavigationStack {
                if let selectedMainItem = selectedMainItem {
                    Text("Item at \(selectedMainItem.timestamp!, formatter: itemFormatter)")
                } else {
                    Text("Please select a main item")
                }
            }
            
            
        }
    }

    private func addItem() {
        withAnimation {
            let newItem = Item(context: viewContext)
            newItem.timestamp = Date()

            do {
                try viewContext.save()
            } catch {
                // Replace this implementation with code to handle the error appropriately.
                // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
                let nsError = error as NSError
                fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
            }
        }
    }

    private func deleteItems(offsets: IndexSet) {
        withAnimation {
            offsets.map { items[$0] }.forEach(viewContext.delete)

            do {
                try viewContext.save()
            } catch {
                // Replace this implementation with code to handle the error appropriately.
                // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
                let nsError = error as NSError
                fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
            }
        }
    }
}

我只是使用默认的核心数据SwiftUI应用程序模板创建了它。然后将其转换为使用NavigationSplitView和新的NavigationLink。

在选择列表中的项时，要更改选定单元格状态的颜色。现在看起来是这样的：

​

​

我想做，所以蓝色的选择实际上是红色的。

有没有办法将选择的颜色从默认的颜色更改为我想要的任何颜色？

Answer 1

您可以尝试这种方法，使用listRowBackground和selectedMainItem以及item.id。

List(selection: $selectedMainItem) {
    ForEach(items) { item in
        NavigationLink(value: item) {
            Text("Item  \(item.id.debugDescription)")
        }
        // -- here
        .listRowBackground(selectedMainItem != nil
            ? (selectedMainItem!.id == item.id ? Color.red : Color.clear)
            : Color.clear)
    }
    .onDelete(perform: deleteItems)
}