How make the Zoom level appropriately as per my picture for MKMapView?

Question

In my app, I'm using MKMapView I want to zoom as per my picture I tried MKMakeCoordinate with various values randomly but didn't received the exact result. Please help to issue this issue.

Answer 1

// delta is the zoom factor // 2 will zoom out x2 // .5 will zoom in by x2

-(void)zoomMap:(MKMapView*)mapView byDelta:(float) delta 
{

    MKCoordinateRegion region = mapView.region;
    MKCoordinateSpan span = mapView.region.span;
    span.latitudeDelta*=delta;
    span.longitudeDelta*=delta;
    region.span=span;
    [mapView setRegion:region animated:YES];

}