Map region on Universal application

Hello.

I have an application with two storyboards (one for iPad and one for iPhone). I use the following to set the map area:

  -(void) viewWillAppear:(BOOL)animated
    {
        ...
      
        [self.mapView removeAnnotations:self.mapView.annotations];
        self.mapLocations = [[NSMutableArray alloc]init];
        self.showMapRect = MKMapRectNull;
        [self addAnnotation];
        [self.mapView setVisibleMapRect:self.showMapRect edgePadding:UIEdgeInsetsMake(30, 30, 30, 30) animated:YES];
    }
   
   
    -(void) addAnnotation
    {
        CLLocationCoordinate2D mapLocation;
       
        IGAMapAnnotation *mapAnnotation;
       
        // If a set of coordinates is empty, it will have an empty object @"".
        // This object must be removed from the array, otherwise it will be an error.
        // In order not to change the original array, we create a copy
       
        NSMutableArray *coordinatesTempArray = [[NSMutableArray alloc]initWithArray:self.coordinatesArray copyItems:YES];
        [coordinatesTempArray removeObject:@""];
       
        // Calculate how many points are included in the final flightplan
   
        NSInteger numberOfPoints = [coordinatesTempArray count];
       
        // Annotations will be added only of the flight plan includes at least one point
        if (numberOfPoints > 0) {
           
            // Place all annotations so that are are visible on the map using MKMapRect
            for (NSInteger i=0; i < ([coordinatesTempArray count]); i++)
            {   
                mapAnnotation = [[IGAMapAnnotation alloc]init];
               
                // Taking a point in the array and getting its coordinates
                self.mapCoordinates = [coordinatesTempArray objectAtIndex:i];
               
                // Getting a point in the array and getting its latitude and longitude
                self.mapLatitude = [[self.mapCoordinates objectAtIndex:0]doubleValue];
                self.mapLongitude = [[self.mapCoordinates objectAtIndex:1]doubleValue];
               
                // Assigning the point coordinates to the coordinates to be displayed on the map
                mapLocation.latitude = self.mapLatitude;
                mapLocation.longitude = self.mapLongitude;
               
                // Adding coordinates to the map annotation
                mapAnnotation.coordinate = mapLocation;
               
                // Adding the annotation to the array that will be added to the map
                [self.mapLocations addObject:mapAnnotation];
               
                // Adding Annotation coordinates to MKMapRect so that they all be visible in the view
                MKMapPoint annotationMapPoint = MKMapPointForCoordinate(mapLocation);
                MKMapRect annotationMapRect = MKMapRectMake(annotationMapPoint.x, annotationMapPoint.y, 0, 0);
               
                self.showMapRect = MKMapRectUnion(self.showMapRect, annotationMapRect);
               
            }
        }
       
        // Adding annotations to the map
        [self.mapView addAnnotations:self.mapLocations];
       
    }

It looks good on iPad (I wish I could upload images -- do not see this option). When the map opens, it has exactly the required span, all points on the map are visible. However, when I open the map on iPhone, the map is zoomed in, I see the central part, and the points are outside of the map boundaries.

My iPad application is landscape only, and iPhone -- portrait only.

Is there a way to have a map rect that would fit both?

Thanks a lot!