是否在SwiftUI选取器中为NSManagedObject设置默认值？

import SwiftUI

struct ContentView: View {
    @Environment(\.managedObjectContext) private var viewContext
    
    @FetchRequest(
        entity: YourEntity.entity(),
        sortDescriptors: [],
        predicate: nil,
        animation: .default
    ) private var yourObjects: FetchedResults<YourEntity>
    
    @State private var selectedObject: YourEntity?
    
    var body: some View {
        Picker("Select an object", selection: $selectedObject) {
            ForEach(yourObjects, id: \.self) { object in
                Text(object.name ?? "")
            }
        }
        .onAppear {
            selectedObject = yourObjects.first // 设置默认值为第一个对象
        }
    }
}