MKMapView not loading to my specified position - ios

Question

I have an MKMapView on my storyboard and when i go to the storyboard just a default view loads not the specifications have set lat and long and span but doesnt zoom to the location im looking for.
here is .h
//
// ContactViewController.h
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#interface ContactViewController : UIViewController
#property (weak, nonatomic) IBOutlet MKMapView *myMapView;
#end
here is .m
//
// ContactViewController.m
#import "ContactViewController.h"
#interface ContactViewController ()
#end
// define long and lat of location
#define map_long 42.877391;
#define map_lat -80.734766;
// define span
#define map_span 0.05f;
#implementation ContactViewController
#synthesize myMapView;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
//[super viewDidLoad];
MKCoordinateRegion myregion;
CLLocationCoordinate2D mycenter;
mycenter.latitude = map_lat;
mycenter.longitude = map_long;
MKCoordinateSpan myspan;
myspan.latitudeDelta = map_span;
myspan.longitudeDelta = map_span;
myregion.center = mycenter;
myregion.span = myspan;
// Do any additional setup after loading the view.
[myMapView setRegion:myregion animated:YES];
[myMapView setCenterCoordinate:mycenter animated:YES];
}
#end

Answer 1

You're not assigning anything to myCenter .
You should be creating your region with something like:
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(yourCenterCoord, 250, 250);
(where the first parameter is your CLLocationCoordinate2D center variable and the other two are latitude and longitude distance from center)