Xamarin.IOS ZoomToFitMapAnnoations

zoomToFitMapAnnotations.cs

public static class MapHelper
    {
        public static void CenterMap(this MapKit.MKMapView map, CLLocationCoordinate2D mapCenter)
        {
            map.SetRegion(MKCoordinateRegion.FromDistance(mapCenter, 1000, 1000), true);
        }

        public static void ZoomToFitMapAnnotations(this MapKit.MKMapView map)
        {
            map.ShowAnnotations(map.Annotations, false);
        }
        
        public static void ZoomToFitMapCoordinates(this MapKit.MKMapView map, List<CLLocationCoordinate2D> coordinates)
        {
            if (map.Annotations.Length <= 0)
                return;

            var topLeftCoord = new CLLocationCoordinate2D(-90, 180);
            var bottomRightCoord = new CLLocationCoordinate2D(90, -180);

            foreach (var coordinate in coordinates)
            {
                topLeftCoord.Longitude = Math.Min(topLeftCoord.Longitude, coordinate.Longitude);
                topLeftCoord.Latitude = Math.Max(topLeftCoord.Latitude, coordinate.Latitude);
                bottomRightCoord.Longitude = Math.Max(bottomRightCoord.Longitude, coordinate.Longitude);
                bottomRightCoord.Latitude = Math.Min(bottomRightCoord.Latitude, coordinate.Latitude);
            }

            double delta = 1.4;
            MKCoordinateRegion region = new MKCoordinateRegion();
            region.Center.Latitude = topLeftCoord.Latitude - (topLeftCoord.Latitude - bottomRightCoord.Latitude) * 0.5; //0.5
            region.Center.Longitude = topLeftCoord.Longitude + (bottomRightCoord.Longitude - topLeftCoord.Longitude) * 0.5; //0.5
            region.Span.LatitudeDelta = Math.Abs((topLeftCoord.Latitude - bottomRightCoord.Latitude) * delta);
            region.Span.LongitudeDelta = Math.Abs((bottomRightCoord.Longitude - topLeftCoord.Longitude) * delta);

            region = map.RegionThatFits(region);
            map.SetRegion(region, true);
        }
    }

        
 // InvokeOnMainThread(() =>  {     });