Answers

• RicardoPOR Member ✭✭

  June 2019 Accepted Answer

  I found a solution.. quite simple:

  NSData jsonData = NSData.FromString(jsonSerialized, NSStringEncoding.UTF8);
  

  1
• ColeX Member, Xamarin Team Xamurai

  June 2019 edited June 2019 Accepted Answer

  NSData Serialize(NSObject obj, NSJsonWritingOptions opt, out NSError error);

  obj here should be NSDictionary not NSString,check https://stackoverflow.com/a/30618924/8187800.

  I tried the following code , it works fine .

  NSDictionary json = NSDictionary.FromObjectAndKey(new NSString("a") , new NSString("a"));         
     NSData jsonData = NSJsonSerialization.Serialize(json, NSJsonWritingOptions.SortedKeys, out error);
  

  So you major problem is how to convert json string to NSDictionary.

  5
• RicardoPOR Member ✭✭

  June 2019

  @ColeX it worked too! but i found my solution to be more simple

  0
• ColeX Member, Xamarin Team Xamurai

  June 2019

  @RicardoPOR said:
  @ColeX it worked too! but i found my solution to be more simple

  Of course ,your solution is the direct method from NSString to NSData.

  0
• RicardoPOR Member ✭✭

  June 2019

  @ColeX said:

  @RicardoPOR said:
  @ColeX it worked too! but i found my solution to be more simple

  Of course ,your solution is the direct method from NSString to NSData.

  i was overcomplicating things up, thank you anyway for your time

  0
• JoannaG Member ✭✭✭

  July 2020

  Hi @colex,

  Am using naxam mapbox and struggling to load coordinates from json in ios . Here, my code tried in ios xamarin.

    var bundlePath = NSBundle.MainBundle.BundlePath;
              var filename = Path.Combine(bundlePath,"StateBoundaries.json");//valid https://docs.mapbox.com/mapbox-gl-js/assets/us_states.geojson
              StreamReader inputStream = new StreamReader(filename);
              string Us_country_jsonSerialized = inputStream.ReadToEnd();
              NSError err;
  
              NSData jsonData = NSData.FromString(Us_country_jsonSerialized, NSStringEncoding.UTF8);
              var source = new MGLShapeSource("identifier",MGLShape.ShapeWithData(jsonData, 4,out err ),null);
              MapView.Style?.AddSource(source);
  
              var layer = new MGLFillStyleLayer(identifier: "layerIdentifier", source);
              layer.FillColor = NSExpression.FromConstant(UIColor.Yellow);
  

  I completed in android.

   //Added full country points.
                      loadedMapStyle.AddSource(new GeoJsonSource(Us_country, Us_country));
  
                      //Filled each state with color
                      FillLayer countryPolygonFillLayer = new FillLayer(Us_country, Us_country);
                      countryPolygonFillLayer.SetProperties(
                      PropertyFactory.FillColor(Color.ParseColor("#D1F2EB55")));
                      loadedMapStyle.AddLayer(countryPolygonFillLayer);
  

  My requirement is to fill color to full US region. But in ios alone my failing some how. Can you please find and let me know what am doing wrong.

  0
• JoannaG Member ✭✭✭

  July 2020

  Hi @ColeX /@Ricardo,
  How do i can calculate nunit value given for MGLShape date

  0
• RicardoPOR Member ✭✭

  July 2020

  @JoannaG said:
  Hi @ColeX /@Ricardo,
  How do i can calculate nunit value given for MGLShape date

  Hi @JoannaG, this is what i think you are looking for:

  first i created this classes with the geojson property names, that will make it easier to serialize to the geojson source:

  public class MapBoxFeatureCollection
  {
      public string type { get; set; }
      public Crs crs { get; set; }
      public List<MapFeaturePoint> features { get; set; }
  
      public class Properties
      {
          public string name { get; set; }
      }
  
      public class Crs
      {
          public string type { get; set; }
          public Properties properties { get; set; }
      }
  }
  

  ---

  public class MapFeaturePoint
  {
      public string type { get; set; }
      public Geometry geometry { get; set; }
      public Properties properties { get; set; }
  }
  
  public class Geometry
  {
      public string type { get; set; }
      public List<double> coordinates { get; set; }
  
      public double Latitude => coordinates != null ? coordinates[1] : 0;
      public double Longitude => coordinates != null ? coordinates[0] : 0;
  }
  
  public class Properties
  {
      public int id { get; set; }
      public string icon { get; set; }
  //More Properties can be added here
  }
  

  then i created this function that returns the geojson, by serializing the list of MapFeaturePoint:

      public MGLShape GenerateFeatureCollection(List<MapFeaturePoint> Points)
      {
          //Create MGLShape From MapPoints
          MapBoxFeatureCollection fc = new MapBoxFeatureCollection() { features = Points, type = "FeatureCollection" };
          string jsonSerialized = JsonConvert.SerializeObject(fc);
  
          NSError error = null;
          NSData jsonData = NSData.FromString(jsonSerialized, NSStringEncoding.UTF8);
          var shape = MGLShape.ShapeWithData(jsonData, 4, out error);
          return shape;
      }
  

  then you just need to use the shape when creating the source (added the code for geojson source options also):

          #region GeoJsonOptions
          var keys = new[]
              {
                      MGLShapeSourceOptions.Clustered,//If the points can cluster
                      MGLShapeSourceOptions.ClusterRadius, //Radius for the points to cluster
                      MGLShapeSourceOptions.MaximumZoomLevelForClustering//Maximum map zoom for points to cluster
                  };
          var objects = new NSObject[]
          {
                      FromObject(new NSNumber(false)),
                      FromObject(new NSNumber(30f)),
                      FromObject(new NSNumber(11f))
          };
          var GeojsonSourceOptions = new NSDictionary<NSString, NSObject>(keys, objects);
          #endregion
  
          var source = new MGLShapeSource("geojson-source", featureCollection, GeojsonSourceOptions);
          mapView.Style.AddSource(source);
  

  And that's how i add the source for the layers

  0