Add getZoomLevel() method to controller class

Author: Maximilian Fuchs

ios/Classes/MapView/AppleMapController.swift

@@ -234,6 +234,8 @@ public class AppleMapController : NSObject, FlutterPlatformView, MKMapViewDelega
                     result(self.mapView.isMyLocationButtonShowing ?? false)
                 case "map#getMinMaxZoomLevels":
                     result([self.mapView.minZoomLevel, self.mapView.maxZoomLevel])
+                case "camera#getZoomLevel":
+                    result(self.mapView.calculatedZoomLevel)
                 default:
                     result(FlutterMethodNotImplemented)
                     return

lib/src/controller.dart

@@ -219,6 +219,11 @@ class AppleMapController {
     });
   }
 
+  /// Returns the current zoomLevel.
+  Future<double> getZoomLevel() async {
+    return channel.invokeMethod<double>('camera#getZoomLevel');
+  }
+
   /// Return [LatLngBounds] defining the region that is visible in a map.
   Future<LatLngBounds> getVisibleRegion() async {
     final Map<String, dynamic> latLngBounds =