I'm using a MKMapView
inside an iPhone app. When I click a button the zoom level must increase. This is my first approach:
MKCoordinateRegion zoomIn = mapView.region;
zoomIn.span.latitudeDelta *= 0.5;
[mapView setRegion:zoomIn animated:YES];
However, this code had no effect, since I didn't update the longitudeDelta value. So I added this line:
zoomIn.span.longitudeDelta *= 0.5;
Now it works, but only sometimes. The latitudeDelta
and longitudeDelta
don't change in the same way, I mean, their values are not proportional. Any idea how to solve this?
I have no idea if this is the right way to do it, but I'm using this to zoom in and out.
case 0: { // Zoom In
//NSLog(@"Zoom - IN");
MKCoordinateRegion region;
//Set Zoom level using Span
MKCoordinateSpan span;
region.center=mapView.region.center;
span.latitudeDelta=mapView.region.span.latitudeDelta /2.0002;
span.longitudeDelta=mapView.region.span.longitudeDelta /2.0002;
region.span=span;
[mapView setRegion:region animated:TRUE];
}
break;
// Zoom Out
case 2: {
//NSLog(@"Zoom - OUT");
MKCoordinateRegion region;
//Set Zoom level using Span
MKCoordinateSpan span;
region.center=mapView.region.center;
span.latitudeDelta=mapView.region.span.latitudeDelta *2;
span.longitudeDelta=mapView.region.span.longitudeDelta *2;
region.span=span;
[mapView setRegion:region animated:TRUE];
}