swift-macos

macOS App Development - Swift 6.3

Build native macOS apps with Swift 6.3 (latest: 6.3.3, bundled in Xcode 26.6, Jun 2026), SwiftUI, SwiftData, and macOS 26 Tahoe (26.6.2 current). Target macOS 14+ for SwiftData/@Observable, macOS 15+ for latest SwiftUI, macOS 26 for Liquid Glass and Foundation Models. Note Xcode 26.6 still bundles the macOS 26.5 SDK, so 26.6-only API is not yet buildable. For the WWDC 2026 beta stack (macOS 27, Xcode 27, Swift 6.4, shipping fall 2026), see references/fall-2026-releases.md.

Quick Start

import SwiftUI
import SwiftData

@Model
final class Project {
    var name: String
    var createdAt: Date
    // Named ProjectTask, not Task - `Task` would shadow `Swift.Task`
    @Relationship(deleteRule: .cascade) var tasks: [ProjectTask] = []

    init(name: String) {
        self.name = name
        self.createdAt = .now
    }
}

@Model
final class ProjectTask {
    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, ProjectTask.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")
            }
        }
    }
}