Display the map scale in mapkit

Question

I am working with mapkit in Xcode 5.1 and am trying to display the map scale in regionDidChangeAnimated. I have no idea now to accomplish this though. I tried to look around and was unsuccessful. Any ideas?

EDIT:

-(void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated {

CGPoint nePoint = CGPointMake(self.mapView.bounds.origin.x + mapView.bounds.size.width, mapView.bounds.origin.y);
CGPoint swPoint = CGPointMake((self.mapView.bounds.origin.x), (mapView.bounds.origin.y + mapView.bounds.size.height));

CLLocationCoordinate2D neCoord;
neCoord = [self.mapView convertPoint:nePoint toCoordinateFromView:self.mapView];
CLLocationCoordinate2D swCoord;
swCoord = [self.mapView convertPoint:swPoint toCoordinateFromView:self.mapView];

CLLocationDistance distance = [neCoord distanceFromLocation:swCoord];
}

Any reason why I am getting an error with the last line, CLLocationDistance?

The distanceFromLocation method is in the CLLocation class. neCoord is a CLLocationCoordinate2D struct (not a CLLocation). To create a CLLocation from a CLLocationCoordinate2D, see http://stackoverflow.com/questions/2318547/cllocationcoordinate2d-to-cllocation. — , Jul 19 '14 at 11:56

score 0 · Accepted Answer · answered Jul 18 '14 at 18:59

Use the methods that translate between the coordinates on the map and the points on the map view, such as convertPoint:toCoordinateFromView:. Use the edge points of your view for this.

Now you have the coordinates - you can calculate the distances between the points with CLLocation's distanceFromLocation:. You can make some assumptions about the width of your view based on the physical properties of, day an iPhone or iPad and calculate the scale.

Display the map scale in mapkit

1 Answers1