MKMapView does not read the given coordinates - ios

Question

ViewController.h
#import <UIKit/UIKit.h>
#import "MapKit/MapKit.h"
#interface ViewController : UIViewController <MKMapViewDelegate>
#property (weak, nonatomic) IBOutlet MKMapView *mapView;
#end
ViewController.m
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
//Setting Region
//MKCoordinateRegion *myRegion;
//Center
CLLocationCoordinate2D center;
center.longitude = 55.316667;
center.latitude = 25.266667;
//SPAN
MKCoordinateSpan span;
span.latitudeDelta = 0.30f;
span.longitudeDelta = 0.30f;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
As you see my code seems to be fine, and normally it should show the location given in latitude and longtitude values. But instead it shows this :
I am working in Xcode 5 with iOS 6.
Any ideas about the problem?

Answer 1

Nowhere in the code shown does it "give the coordinates to the map view" so why should it do anything?
All the code does is:
Declares local variables called center and span in the viewDidLoad method.
Sets the values of these local variables (which the map view knows nothing about).
The viewDidLoad method ends (doing nothing with the values of the local variables).
Adding this line after setting center and span actually gives the coordinates to the map view so that it shows those coordinates:
mapView.region = MKCoordinateRegionMake(center, span);
(Assuming, of course, that the mapView IBOutlet is connected to the MKMapView in the xib.)
Now, this will center the map view at the coordinates you specified and that's it.
If you were expecting any other effects (such as a pin appearing at the coordinates), you'll need to create an annotation with those coordinates and tell the map view to add it.