Map View Viewing Issues - ios

Question

I have my iPhone application that loads a map view, my problem is that it loads the map view zeroed in on one single map pin, I want it to load in a more holistic view that shows the whole map of the United States right when the app is launched. Is there a way to execute this? Here is my code:
ViewController.h
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#interface ViewController : UIViewController
{
MKMapView *mapView;
}
#property (nonatomic, retain) IBOutlet MKMapView *mapView;
-(IBAction)SetMap:(id)sender;
-(IBAction)GetLocation:(id)sender;
-(IBAction)Directions:(id)sender;
#end
ViewController.m
#import "ViewController.h"
#import "MapPin.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize mapView;
- (void)viewDidLoad
{
[super viewDidLoad];
//Moss Preserve coordinates
MKCoordinateRegion MossPreserveRegion = { {0.0, 0.0}, {0.0, 0.0}};
MossPreserveRegion.center.latitude = 33.3816566;
MossPreserveRegion.center.longitude = -86.8415451;
MossPreserveRegion.span.longitudeDelta = 0.01f;
MossPreserveRegion.span.latitudeDelta = 0.01f;
[mapView setRegion:MossPreserveRegion animated:YES];
//Moss Preserve annotation and map pin
MapPin *MossPreserveAnnotation = [[MapPin alloc] init];
MossPreserveAnnotation.title = #"Moss Rock Preserve Boulder Fields";
MossPreserveAnnotation.subtitle = #"Preserve Pkwy, Hoover, AL";
MossPreserveAnnotation.coordinate = MossPreserveRegion.center;
[mapView addAnnotation:MossPreserveAnnotation];
//Horse Pens 40 coordinates
MKCoordinateRegion HorsePenRegion = { {0.0, 0.0}, {0.0, 0.0}};
HorsePenRegion.center.latitude = 33.9207535;
HorsePenRegion.center.longitude = -86.3089447;
HorsePenRegion.span.longitudeDelta = 0.01f;
HorsePenRegion.span.latitudeDelta = 0.01f;
[mapView setRegion:HorsePenRegion animated:YES];
//Horse Pens 40 annotation and map pin
MapPin *HorsePenAnnotation = [[MapPin alloc] init];
HorsePenAnnotation.title = #"Horse Pens 40";
HorsePenAnnotation.subtitle = #"Steele, AL ";
HorsePenAnnotation.coordinate = HorsePenRegion.center;
[mapView addAnnotation:HorsePenAnnotation];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(IBAction)SetMap:(id)sender;
{
switch (((UISegmentedControl *) sender).selectedSegmentIndex)
{
case 0:
mapView.mapType = MKMapTypeStandard;
break;
case 1:
mapView.mapType = MKMapTypeSatellite;
break;
case 2:
mapView.mapType = MKMapTypeHybrid;
break;
default:
break;
}
}
-(IBAction)GetLocation:(id)sender;
{
mapView.showsUserLocation = YES;
}
-(IBAction)Directions:(id)sender;
{
NSString *urlString = #"http://maps.apple.com/maps?daddr=33.3816566,-86.8415451";
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlString]];
}
#end
MapPin.h
#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>
#interface MapPin : NSObject <MKAnnotation>
{
CLLocationCoordinate2D coordinate;
NSString *title;
NSString *subtitle;
}
#property (nonatomic, assign) CLLocationCoordinate2D coordinate;
#property (nonatomic, copy) NSString *title;
#property (nonatomic, copy) NSString *subtitle;
#end
MapPin.m
#import "MapPin.h"
#implementation MapPin
#synthesize coordinate, title, subtitle;
#end
Thank you for any advice

Answer 1

You need to set the zoom level of an MKMapView.
Better look at this:
http://troybrant.net/blog/2010/01/set-the-zoom-level-of-an-mkmapview/