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Exemplo de como destacar uma região específica no mapa com Xamarin.Forms http://julianocustodio.com/regioes-maps-xamarin-forms
using UIKit;
using Xamarin.Forms;
using App.iOS;
using Xamarin.Forms.Maps.iOS;
using MapKit;
using Xamarin.Forms.Platform.iOS;
using CoreLocation;
using ObjCRuntime;
[assembly: ExportRenderer(typeof(global::App.CustomMap), typeof(CustomMapRenderer))]
namespace App.iOS
{
public class CustomMapRenderer : MapRenderer
{
MKPolygonRenderer polygonRenderer;
protected override void OnElementChanged(ElementChangedEventArgs<View> e)
{
base.OnElementChanged(e);
if (e.OldElement != null)
{
var nativeMap = Control as MKMapView;
if (nativeMap != null)
{
nativeMap.RemoveOverlays(nativeMap.Overlays);
nativeMap.OverlayRenderer = null;
polygonRenderer = null;
}
}
if (e.NewElement != null)
{
var formsMap = (global::App.CustomMap)e.NewElement;
var nativeMap = Control as MKMapView;
nativeMap.OverlayRenderer = GetOverlayRenderer;
CLLocationCoordinate2D[] coords = new CLLocationCoordinate2D[formsMap.ShapeCoordinates.Count];
int index = 0;
foreach (var position in formsMap.ShapeCoordinates)
{
coords[index] = new CLLocationCoordinate2D(position.Latitude, position.Longitude);
index++;
}
var blockOverlay = MKPolygon.FromCoordinates(coords);
nativeMap.AddOverlay(blockOverlay);
}
}
MKOverlayRenderer GetOverlayRenderer(MKMapView mapView, IMKOverlay overlayWrapper)
{
if (polygonRenderer == null && !Equals(overlayWrapper, null))
{
var overlay = Runtime.GetNSObject(overlayWrapper.Handle) as IMKOverlay;
polygonRenderer = new MKPolygonRenderer(overlay as MKPolygon)
{
FillColor = UIColor.Red,
StrokeColor = UIColor.Blue,
Alpha = 0.4f,
LineWidth = 9
};
}
return polygonRenderer;
}
}
}
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