func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
  // OneSignal initialization
  OneSignal.initWithLaunchOptions(launchOptions)
  OneSignal.setAppId("YOUR_ONESIGNAL_APP_ID")
}

- (BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
    [OneSignal initWithLaunchOptions:launchOptions];
    [OneSignal setAppId:@"########-####-####-####-############"];
}

let notifWillShowInForegroundHandler: OSNotificationWillShowInForegroundBlock = { notification, completion in
    print("Received Notification: ", notification.notificationId ?? "no id")
    print("launchURL: ", notification.launchURL ?? "no launch url")
    print("content_available = \(notification.contentAvailable)")
    if notification.notificationId == "example_silent_notif" {
        completion(nil)
    } else {
        completion(notification)
    }
}

OneSignal.setNotificationWillShowInForegroundHandler(notifWillShowInForegroundHandler)

id notifWillShowInForegroundHandler = ^(OSNotification *notification, OSNotificationDisplayResponse completion) {
        NSLog(@"Received Notification - %@", notification.notificationId);
        if ([notification.notificationId isEqualToString:@"silent_notif"]) {
            completion(nil);
        } else {
            completion(notification);
        }
    };

[OneSignal setNotificationWillShowInForegroundHandler:notifWillShowInForegroundHandler];

let notificationOpenedBlock: OSNotificationOpenedBlock = { result in
    // This block gets called when the user reacts to a notification received
    let notification: OSNotification = result.notification
    print("Message: ", notification.body ?? "empty body")
    print("badge number: ", notification.badge)
    print("notification sound: ", notification.sound ?? "No sound")
            
    if let additionalData = notification.additionalData {
        print("additionalData: ", additionalData)
        if let actionSelected = notification.actionButtons {
            print("actionSelected: ", actionSelected)
        }
        if let actionID = result.action.actionId {
            //handle the action
        }
    }
}

OneSignal.setNotificationOpenedHandler(notificationOpenedBlock)

id notificationOpenedBlock = ^(OSNotificationOpenedResult *result) {
  OSNotification* notification = result.notification;
  if (notification.additionalData) {
    if (result.action.actionId) {
      fullMessage = [fullMessage stringByAppendingString:[NSString stringWithFormat:@"\nPressed ButtonId:%@", result.action.actionId]];
    }
  }
  
[OneSignal setNotificationOpenedHandler:notificationOpenedBlock];

if let deviceState = OneSignal.getDeviceState() {
    let userId = deviceState.userId
    print("OneSignal Push Player ID: ", userId ?? "called too early, not set yet")
    let subscribed = deviceState.isSubscribed
    print("Device is subscribed: ", subscribed)
    let hasNotificationPermission = deviceState.hasNotificationPermission
    print("Device has notification permissions enabled: ", hasNotificationPermission)
    let notificationPermissionStatus = deviceState.notificationPermissionStatus
    print("Device's notification permission status: ", notificationPermissionStatus.rawValue)
    let pushToken = deviceState.pushToken
    print("Device Push Token Identifier: ", pushToken ?? "no push token, not subscribed")
}

OSDeviceState *deviceState = [OneSignal getDeviceState];
NSString *userId = deviceState.userId;
NSString *pushToken = deviceState.pushToken;
BOOL subscribed = deviceState.isSubscribed;

func onOSPermissionChanged(_ stateChanges: OSPermissionStateChanges)

func onOSPermissionChanged(_ stateChanges: OSPermissionStateChanges!)