iOS Native SDK 2.x.x

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

   let notificationReceivedBlock: OSHandleNotificationReceivedBlock = { notification in

      print("Received Notification: \(notification!.payload.notificationID)")
   }

   let notificationOpenedBlock: OSHandleNotificationActionBlock = { result in
      // This block gets called when the user reacts to a notification received
      let payload: OSNotificationPayload = result!.notification.payload

      var fullMessage = payload.body
      print("Message = \(fullMessage)")

      if payload.additionalData != nil {
         if payload.title != nil {
            let messageTitle = payload.title
               print("Message Title = \(messageTitle!)")
         }

         let additionalData = payload.additionalData
         if additionalData?["actionSelected"] != nil {
            fullMessage = fullMessage! + "\nPressed ButtonID: \(additionalData!["actionSelected"])"
         }
      }
   }

   let onesignalInitSettings = [kOSSettingsKeyAutoPrompt: false,
      kOSSettingsKeyInAppLaunchURL: false]

   OneSignal.initWithLaunchOptions(launchOptions, 
      appId: "YOUR_ONESIGNAL_APP_ID", 
      handleNotificationReceived: notificationReceivedBlock, 
      handleNotificationAction: notificationOpenedBlock, 
      settings: onesignalInitSettings)

   OneSignal.inFocusDisplayType = OSNotificationDisplayType.notification

   return true
}

- (BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions {
 
  id notificationReceiverBlock = ^(OSNotification *notification) {
    NSLog(@"Received Notification - %@", notification.payload.notificationID);
  };
  
  id notificationOpenedBlock = ^(OSNotificationOpenedResult *result) {
        // This block gets called when the user reacts to a notification received
        OSNotificationPayload* payload = result.notification.payload;
        
        NSString* messageTitle = @"OneSignal Example";
        NSString* fullMessage = [payload.body copy];
        
        if (payload.additionalData) {
            
            if(payload.title)
                messageTitle = payload.title;
            
            NSDictionary* additionalData = payload.additionalData;
            
            if (additionalData[@"actionSelected"])
                fullMessage = [fullMessage stringByAppendingString:[NSString stringWithFormat:@"\nPressed ButtonId:%@", additionalData[@"actionSelected"]]];
        }
        
        UIAlertView* alertView = [[UIAlertView alloc] initWithTitle:messageTitle
                                                            message:fullMessage
                                                           delegate:self
                                                  cancelButtonTitle:@"Close"
                                                  otherButtonTitles:nil, nil];
        [alertView show];

   };
  
   id onesignalInitSettings = @{kOSSettingsKeyAutoPrompt : @YES};
  
   [OneSignal initWithLaunchOptions:launchOptions
                              appId:@"YOUR_ONESIGNAL_APP_ID"
         handleNotificationReceived:notificationReceiverBlock
           handleNotificationAction:notificationOpenedBlock
                           settings:onesignalInitSettings];
  
}

let notificationReceivedBlock: OSHandleNotificationReceivedBlock = { notification in
    print("Received Notification - \(notification.payload.notificationID) - \(notification.payload.title)")
}

^(OSNotification *notification) {
    NSLog(@"Received Notification - %@ - %@", notification.payload.notificationID, notification.payload.title);
}

let notificationOpenedBlock: OSHandleNotificationActionBlock = { result in
   // This block gets called when the user reacts to a notification received
   let payload: OSNotificationPayload = result!.notification.payload

   var fullMessage = payload.body
   print("Message = \(fullMessage)")

   if payload.additionalData != nil {
     if payload.title != nil {
         let messageTitle = payload.title
            print("Message Title = \(messageTitle!)")
      }

      let additionalData = payload.additionalData
      if additionalData?["actionSelected"] != nil {
         fullMessage = fullMessage! + "\nPressed ButtonID: \(additionalData!["actionSelected"])"
      }
   }
}

^(OSNotificationOpenedResult *result) {
        
   // This block gets called when the user opens or taps an action on a notification
   OSNotificationPayload* payload = result.notification.payload;
        
   NSString* messageTitle = @"OneSignal Example";
   NSString* fullMessage = [payload.body copy];
        
   if (payload.additionalData) {
      if (payload.title)
         messageTitle = payload.title;
            
      NSDictionary* additionalData = payload.additionalData;
            
      if (additionalData[@"actionSelected"])
         fullMessage = [fullMessage stringByAppendingString:[NSString stringWithFormat:@"\nPressed ButtonId:%@", additionalData[@"actionSelected"]]];
   }
  
   UIAlertView* alertView = [[UIAlertView alloc]
                               initWithTitle:messageTitle
                                     message:fullMessage
                                    delegate:self
                           cancelButtonTitle:@"Close"
                          otherButtonTitles:nil, nil];
   [alertView show];
}

// will open iOS Settings for your app
OneSignal.presentAppSettings()

[OneSignal presentAppSettings];

OneSignal.postNotification(["contents": ["en": "Test Message"], "include_player_ids": ["3009e210-3166-11e5-bc1b-db44eb02b120"]])

[OneSignal postNotification:@{
   @"contents" : @{@"en": @"Test Message"},
   @"include_player_ids": @[@"3009e210-3166-11e5-bc1b-db44eb02b120"]
}];