swift-macos

import SwiftUI
import SwiftData
@Model
final class Project {
    var name: String
    var createdAt: Date
    @Relationship(deleteRule: .cascade) var tasks: [Task] = []
    init(name: String) {
        self.name = name
        self.createdAt = .now
    }
}
@Model
final class Task {
    var title: String
    var isComplete: Bool
    var project: Project?
    init(title: String) {
        self.title = title
        self.isComplete = false
    }
}
@main
struct MyApp: App {
    var body: some Scene {
        WindowGroup("Projects") {
            ContentView()
        }
        .modelContainer(for: [Project.self, Task.self])
        .defaultSize(width: 900, height: 600)
        #if os(macOS)
        Settings { SettingsView() }
        MenuBarExtra("Status", systemImage: "circle.fill") {
            MenuBarView()
        }
        .menuBarExtraStyle(.window)
        #endif
    }
}
struct ContentView: View {
    @Query(sort: \Project.createdAt, order: .reverse)
    private var projects: [Project]
    @Environment(\.modelContext) private var context
    @State private var selected: Project?
    var body: some View {
        NavigationSplitView {
            List(projects, selection: $selected) { project in
                NavigationLink(value: project) {
                    Text(project.name)
                }
            }
            .navigationSplitViewColumnWidth(min: 200, ideal: 250)
        } detail: {
            if let selected {
                DetailView(project: selected)
            } else {
                ContentUnavailableView("Select a Project",
                    systemImage: "sidebar.left")
            }
        }
    }
}