How to show local notification when the app is foreground?

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In order to display the notification when the app is foreground/open, you need to add a delegate method. You have to implement UNUserNotificationCenterDelegate in order to get the local notification when the app is open.

Add the following extension in AppDelegate

// Conform to UNUserNotificationCenterDelegate to show local notification in foreground
extension AppDelegate: UNUserNotificationCenterDelegate {
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        completionHandler([.alert, .badge, .sound])
    }
}

Add don’t forget to add this

UNUserNotificationCenter.current().delegate = self

in application’s didFinishLaunchingWithOptions function.

 func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
        // Show local notification in foreground
        UNUserNotificationCenter.current().delegate = self
        return true
}

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If you are using SwiftUI’s new app cycle “SwiftUI App” then the following code can help you.

class AppDelegate: NSObject, UIApplicationDelegate {
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {

        // Show local notification in foreground
        UNUserNotificationCenter.current().delegate = self
        
        return true
    }
}

// Conform to UNUserNotificationCenterDelegate to show local notification in foreground
extension AppDelegate: UNUserNotificationCenterDelegate {
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        completionHandler([.alert, .badge, .sound])
    }
}

@main
struct MyTestApp: App {

    @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate

    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

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