SwiftUI使用CoreData编辑列表中的项目

struct ProjectListView: View {
    @Environment(\.managedObjectContext) private var viewContext
    
    @FetchRequest(
        sortDescriptors: [NSSortDescriptor(keyPath: \Project.timestamp, ascending: true)],
        animation: .default)
    private var projects: FetchedResults<Project>
    
    var body: some View {
        List {
            ForEach(projects) { project in
                Text(project.name ?? "")
            }
        }
    }
}

struct ProjectEditView: View {
    @Environment(\.managedObjectContext) private var viewContext
    
    @FetchRequest(
        sortDescriptors: [],
        predicate: NSPredicate(format: "id == %@", argumentArray: [selectedProjectID]),
        animation: .default)
    private var projects: FetchedResults<Project>
    
    @State private var projectName: String = ""
    
    var body: some View {
        VStack {
            TextField("Project Name", text: $projectName)
                .textFieldStyle(RoundedBorderTextFieldStyle())
            
            Button("Save") {
                if let project = projects.first {
                    project.name = projectName
                    try? viewContext.save()
                }
            }
        }
    }
}

struct ContentView: View {
    var body: some View {
        NavigationView {
            ProjectListView()
                .navigationBarTitle("Projects")
            
            ProjectEditView()
                .navigationBarTitle("Edit Project")
        }
    }
}