Map head nowhere on first time - ios

Question

I put a map into my iOs app and I setted it in this way:
- (void)viewDidLoad {
[super viewDidLoad];
CLLocationCoordinate2D cord = {.latitude = 44.508473, .longitude = 11.375828};
[self.myMap setRegion:MKCoordinateRegionMake(cord, MKCoordinateSpanMake(.005, .005)) animated:YES];
AddressAnnotation * annotazione = [[AddressAnnotation alloc] init];
[annotazione setCoordinate:cord];
[self.myMap addAnnotation:annotazione];
}
and AddressAnnotation.m:
- (void)setCoordinate:(CLLocationCoordinate2D)coord {
coordinate = coord;
}
It works but first time I open map's view it shows a zone near the Antartica sea (pin head to coordinates but map shows Antartic sea zones) and closing and reopening map's view it shows exactly my pin.
How can I show map zoomed on Pin at first opening?
Thank you so much!

Answer 1

There's nothing wrong with this code. I would probably just define a coordinate property for your AddressAnnotation and let the compiler synthesize the appropriate setter and get rid of the custom setter, though that's probably unrelated to the problem you describe ... It's just easier to do it that way, it ensures that the annotation's coordinate will conform to KVO, etc.
I might suggest that you define your view controller to be the delegate of the map view and then implement regionDidChangeAnimated:
- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated
{
NSLog(#"%s %f, %f %d", __FUNCTION__, mapView.region.center.latitude, mapView.region.center.longitude, animated);
}
It might be useful to know what the region is getting set to and maybe you can reverse engineer what's going on.
But, bottom line, the problem is unrelated to the code you included in your question and the issue undoubtedly rests elsewhere.
By doing this in your project, I saw the following log:
2013-03-30 23:11:12.326 iBo[25408:c07] -[POIMapController mapView:regionDidChangeAnimated:] -47.422141, 0.000000 0
2013-03-30 23:11:12.328 iBo[25408:c07] -[POIMapController mapView:regionDidChangeAnimated:] 44.508473, 11.375828 0
2013-03-30 23:11:12.328 iBo[25408:c07] -[POIMapController mapView:regionDidChangeAnimated:] -47.422141, 0.000000 0
2013-03-30 23:11:12.329 iBo[25408:c07] -[POIMapController mapView:regionDidChangeAnimated:] -47.422141, 0.000000 0
So, clearly your setting the region is taking place, but there's something else which is resetting the region after that happens. Doing a little playing around, I discovered that this behavior only manifests itself when using auto layout. If you turn off auto layout, this behavior goes away and it works like you'd expect.
Alternatively, I noticed that if you moved your code to set the region out of viewDidLoad (which is quite early in the view creation process (after the view are created, but before they appear), and put it in viewDidAppear, it works.