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ChangeFeatureLayerRenderer.cs
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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 Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Symbology;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using System;
using System.Drawing;
using UIKit;
namespace ArcGISRuntimeXamarin.Samples.ChangeFeatureLayerRenderer
{
[Register("ChangeFeatureLayerRenderer")]
public class ChangeFeatureLayerRenderer : UIViewController
{
// Create and hold reference to the used MapView
private MapView _myMapView = new MapView();
//Create and hold reference to the feature layer
private FeatureLayer _featureLayer;
public ChangeFeatureLayerRenderer()
{
Title = "Change feature layer renderer";
}
public override void ViewDidLayoutSubviews()
{
base.ViewDidLayoutSubviews();
// Create the UI, setup the control references and execute initialization
CreateLayout();
Initialize();
}
private async void Initialize()
{
// Create new Map with basemap
Map myMap = new Map(Basemap.CreateTopographic());
// 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
myMap.InitialViewpoint = new Viewpoint(initialLocation);
// Provide used Map to the MapView
_myMapView.Map = myMap;
// Create uri to the used feature service
var serviceUri = new Uri(
"https://sampleserver6.arcgisonline.com/arcgis/rest/services/PoolPermits/FeatureServer/0");
// Initialize feature table using a url to feature server url
ServiceFeatureTable featureTable = new ServiceFeatureTable(serviceUri);
// Initialize a new feature layer based on the feature table
_featureLayer = new FeatureLayer(featureTable);
// Make sure that the feature layer gets loaded
await _featureLayer.LoadAsync();
// Check for the load status. If the layer is loaded then add it to map
if (_featureLayer.LoadStatus == Esri.ArcGISRuntime.LoadStatus.Loaded)
{
// Add the feature layer to the map
myMap.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 a new renderer using the symbol just created
SimpleRenderer renderer = new SimpleRenderer(symbol);
// Assign the new renderer to the feature layer
_featureLayer.Renderer = renderer;
}
private void OnResetButtonClicked(object sender, EventArgs e)
{
// Reset the renderer to default
_featureLayer.ResetRenderer();
}
private void CreateLayout()
{
// Setup the visual frame for the MapView
_myMapView = new MapView()
{
Frame = new CoreGraphics.CGRect(0, 0, View.Bounds.Width, View.Bounds.Height)
};
// Create a button to reset the renderer
var resetButton = new UIBarButtonItem() { Title = "Reset", Style = UIBarButtonItemStyle.Plain };
resetButton.Clicked += OnResetButtonClicked;
// Create a button to apply new renderer
var overrideButton = new UIBarButtonItem() { Title = "Override", Style = UIBarButtonItemStyle.Plain };
overrideButton.Clicked += OnOverrideButtonClicked;
// Add the buttons to the toolbar
SetToolbarItems(new UIBarButtonItem[] {resetButton,
new UIBarButtonItem(UIBarButtonSystemItem.FlexibleSpace, null),
overrideButton}, false);
// Show the toolbar
NavigationController.ToolbarHidden = false;
// Add MapView to the page
View.AddSubviews(_myMapView);
}
}
}