MKMapView map view not zooming to location - ios

Question

When i compile and run my app the map view doesnt zoom to location as i though it would
.h file contains the following
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#interface myContactUsViewController : UIViewController
#property (weak, nonatomic) IBOutlet MKMapView *mapView;
#end
.m file contains the following
#import "myContactUsViewController.h"
#define METERS_PER_MILE 1609.344
#interface myContactUsViewController ()
#end
#implementation myContactUsViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewWillAppear:(BOOL)animated {
// 1
CLLocationCoordinate2D zoomLocation;
zoomLocation.latitude = 39.281516;
zoomLocation.longitude= -76.580806;
// 2
MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(zoomLocation, 0.5*METERS_PER_MILE, 0.5*METERS_PER_MILE);
// 3
[_mapView setRegion:viewRegion animated:YES];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end

Answer 1

CLLocationCoordinate2D zoomLocation;
zoomLocation.latitude = 39.281516;
zoomLocation.longitude= -76.580806;
MKCoordinateRegion region;
MKCoordinateSpan span;
span.latitudeDelta=0.18;
span.longitudeDelta=0.18;
region.span=span;
region.center= zoomLocation;
[self.mapView setRegion:region animated:TRUE];
[self.mapView regionThatFits:region];