Change feature layer renderer

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Change the appearance of a feature layer with a renderer.

Image of change feature layer renderer

Use case

A feature layer hosted on ArcGIS Online has a preset renderer and will display in an ArcGIS Runtime application with that renderer. However, for example, the color associated with the original renderer may be unsuitable for a company with staff or clients who are color blind, or for presentation with a different set of basemap and operational layers. In these cases, the renderer on the feature layer's data can be set to a more suitable color.

How to use the sample

Use the buttons to change the renderer on the feature layer. The original renderer displays orange circles, the diameters of which are proportional to carbon storage of each tree. When the blue renderer in this sample is applied, it displays the location of the trees simply as blue points.

How it works

  1. Create a ServiceFeatureTable from a URL.
  2. Create a FeatureLayer from the service feature table.
  3. Create a new renderer (in this case, a SimpleRenderer).
  4. Change the feature layer's renderer using the FeatureLayer.Renderer property.

Relevant API

  • FeatureLayer.Renderer
  • ServiceFeatureTable
  • SimpleRenderer

About the data

This sample displays a feature layer in Riverside County, California, showing parcels of land and whether they have pool permits. Red polygons indicate parcels that do have permits.

Tags

feature layer, renderer, visualization

Sample Code

ChangeFeatureLayerRenderer.cs
                                                                                                                                                           
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// Copyright 2016 Esri.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
// You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific
// language governing permissions and limitations under the License.

using System;
using System.Drawing;
using Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Symbology;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using UIKit;

namespace ArcGISRuntime.Samples.ChangeFeatureLayerRenderer
{
    [Register("ChangeFeatureLayerRenderer")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Change feature layer renderer",
        category: "Layers",
        description: "Change the appearance of a feature layer with a renderer.",
        instructions: "Use the buttons to change the renderer on the feature layer. The original renderer displays orange circles, the diameters of which are proportional to carbon storage of each tree. When the blue renderer in this sample is applied, it displays the location of the trees simply as blue points.",
        tags: new[] { "feature layer", "renderer", "visualization" })]
    public class ChangeFeatureLayerRenderer : UIViewController
    {
        // Hold references to UI controls.
        private MapView _myMapView;
        private UIBarButtonItem _resetButton;
        private UIBarButtonItem _overrideButton;

        // Hold reference to the feature layer.
        private FeatureLayer _featureLayer;

        public ChangeFeatureLayerRenderer()
        {
            Title = "Change feature layer renderer";
        }

        private void Initialize()
        {
            // Create new Map with basemap.
            Map map = new Map(BasemapStyle.ArcGISTopographic);

            // Create and set initial map area.
            Envelope initialLocation = new Envelope(-1.30758164047166E7, 4014771.46954516, -1.30730056797177E7,
                4016869.78617381, SpatialReferences.WebMercator);

            // Set the initial viewpoint for map.
            map.InitialViewpoint = new Viewpoint(initialLocation);

            // Provide used Map to the MapView.
            _myMapView.Map = map;

            // Create URI to the used feature service.
            Uri serviceUri =
                new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/PoolPermits/FeatureServer/0");

            // Initialize feature table using a URL to a feature service.
            ServiceFeatureTable featureTable = new ServiceFeatureTable(serviceUri);

            // Initialize a new feature layer based on the feature table.
            _featureLayer = new FeatureLayer(featureTable);
            map.OperationalLayers.Add(_featureLayer);
        }

        private void OnOverrideButtonClicked(object sender, EventArgs e)
        {
            // Create a symbol to be used in the renderer.
            SimpleLineSymbol symbol = new SimpleLineSymbol
            {
                Color = Color.Blue,
                Width = 2,
                Style = SimpleLineSymbolStyle.Solid
            };

            // Create and apply a new renderer using the symbol just created.
            _featureLayer.Renderer = new SimpleRenderer(symbol);
        }

        private void OnResetButtonClicked(object sender, EventArgs e)
        {
            // Reset the renderer to default.
            _featureLayer.ResetRenderer();
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();
            Initialize();
        }

        public override void LoadView()
        {
            // Create the views.
            View = new UIView {BackgroundColor = ApplicationTheme.BackgroundColor};

            _myMapView = new MapView();
            _myMapView.TranslatesAutoresizingMaskIntoConstraints = false;

            _resetButton = new UIBarButtonItem();
            _resetButton.Title = "Reset";

            _overrideButton = new UIBarButtonItem();
            _overrideButton.Title = "Override renderer";

            UIToolbar toolbar = new UIToolbar();
            toolbar.TranslatesAutoresizingMaskIntoConstraints = false;
            toolbar.Items = new[]
            {
                _resetButton,
                new UIBarButtonItem(UIBarButtonSystemItem.FlexibleSpace),
                _overrideButton
            };

            // Add the views.
            View.AddSubviews(_myMapView, toolbar);

            // Lay out the views.
            NSLayoutConstraint.ActivateConstraints(new[]
            {
                _myMapView.TopAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.TopAnchor),
                _myMapView.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
                _myMapView.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor),
                _myMapView.BottomAnchor.ConstraintEqualTo(toolbar.TopAnchor),

                toolbar.BottomAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.BottomAnchor),
                toolbar.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
                toolbar.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor),
            });
        }

        public override void ViewWillAppear(bool animated)
        {
            base.ViewWillAppear(animated);

            // Subscribe to events.
            _resetButton.Clicked += OnResetButtonClicked;
            _overrideButton.Clicked += OnOverrideButtonClicked;
        }

        public override void ViewDidDisappear(bool animated)
        {
            base.ViewDidDisappear(animated);

            // Unsubscribe from events, per best practice.
            _resetButton.Clicked -= OnResetButtonClicked;
            _overrideButton.Clicked -= OnOverrideButtonClicked;
        }
    }
}

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