The Kotlin framework
for cross-platform native desktop apps.

1// SwiftUI app (2025) — still goes through UserNotifications + UNNotificationCenter
2import SwiftUI
3import UserNotifications
4
5@main
6struct MyApp: App {
7    @UIApplicationDelegateAdaptor(NotifDelegate.self) var delegate
8    var body: some Scene { WindowGroup { ContentView() } }
9}
10
11func postBuildNotif() async {
12    let center = UNUserNotificationCenter.current()
13
14    // 1. Authorization
15    let ok = try? await center.requestAuthorization(options: [.alert, .sound])
16    guard ok == true else { return }
17
18    // 2. Declare the actions and register the category up-front
19    let reveal = UNNotificationAction(identifier: "REVEAL",
20        title: "Reveal in Finder", options: [.foreground])
21    let copy   = UNNotificationAction(identifier: "COPY",
22        title: "Copy path",         options: [])
23    let share  = UNNotificationAction(identifier: "SHARE",
24        title: "Share…",            options: [.foreground])
25
26    let cat = UNNotificationCategory(identifier: "BUILD_DONE",
27        actions: [reveal, copy, share], intentIdentifiers: [],
28        options: .customDismissAction)
29    center.setNotificationCategories([cat])
30
31    // 3. Build content
32    let content = UNMutableNotificationContent()
33    content.title = "Build complete"
34    content.body  = "Installer ready. What now?"
35    content.categoryIdentifier = "BUILD_DONE"
36    content.sound = .default
37
38    let req = UNNotificationRequest(identifier: UUID().uuidString,
39        content: content, trigger: nil)
40    try? await center.add(req)
41}
42
43// 4. Delegate to receive callbacks (must be retained, AppDelegate is easiest)
44class NotifDelegate: NSObject, UIApplicationDelegate,
45                    UNUserNotificationCenterDelegate {
46    func application(_ a: UIApplication, didFinishLaunchingWithOptions o:
47        [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
48        UNUserNotificationCenter.current().delegate = self
49        return true
50    }
51
52    func userNotificationCenter(_ c: UNUserNotificationCenter,
53        didReceive r: UNNotificationResponse,
54        withCompletionHandler done: @escaping () -> Void) {
55        switch r.actionIdentifier {
56        case "REVEAL":  revealInFinder(file)
57        case "COPY":    copyPath(file)
58        case "SHARE":   shareSheet(file)
59        case UNNotificationDismissActionIdentifier:
60            telemetry.log("notif_dismissed")
61        default: break
62        }
63        done()
64    }
65}
66// + Info.plist NSUserNotificationsUsageDescription
67// + handle authorization revoked mid-app-lifecycle