Zoom mapview to a region where pins are dropped

Question

If I have 3 pins in a mapview, how will I zoom to these pins, when the map loads. That is, when the map loads I need to have a zoomed view, but the view should accomodate al

Answer 1

you may calc the center of all pins

- (CLLocationCoordinate2D)centerPointFromAnnotationArray:(NSArray *)array
{
    CLLocationCoordinate2D coorMax = CLLocationCoordinate2DMake(0, 0);
    CLLocationCoordinate2D coorMin = CLLocationCoordinate2DMake(999, 999);

    for ( int i = 0 ; i < [array count] ; ++i )
    {
        LMPoint *a = [array objectAtIndex:i];

        if (  ( a.coordinate.latitude != 0.0f ) || ( a.coordinate.longitude != 0.0f ) )
        {
            if ( a.coordinate.latitude > coorMax.latitude )
            {
                coorMax.latitude = a.coordinate.latitude;
            }
            if ( a.coordinate.longitude > coorMax.longitude )
            {
                coorMax.longitude = a.coordinate.longitude;
            }
            if ( a.coordinate.latitude < coorMin.latitude )
            {
                coorMin.latitude = a.coordinate.latitude;
            }
            if ( a.coordinate.longitude < coorMin.longitude )
            {
                coorMin.longitude = a.coordinate.longitude;
            }
        }
    }

    CLLocationCoordinate2D coorCenter = CLLocationCoordinate2DMake((coorMax.latitude+coorMin.latitude)/2, (coorMax.longitude+coorMin.longitude)/2);

    return coorCenter;
}

then zoom at the point with a proper zoomlevel