Feature layer (feature service)

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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 Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using UIKit;

namespace ArcGISRuntime.Samples.FeatureLayerUrl
{
    [Register("FeatureLayerUrl")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Feature layer (feature service)",
        category: "Layers",
        description: "Show features from an online feature service.",
        instructions: "Run the sample and view the feature service as an operational layer on top of the basemap. Zoom and pan around the map to see the features in greater detail.",
        tags: new[] { "feature table", "layer", "layers", "service" })]
    public class FeatureLayerUrl : UIViewController
    {
        // Hold references to UI controls.
        private MapView _myMapView;

        public FeatureLayerUrl()
        {
            Title = "Feature layer (feature service)";
        }

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

            // Create and set initial map location.
            MapPoint initialLocation = new MapPoint(-13176752, 4090404, SpatialReferences.WebMercator);
            myMap.InitialViewpoint = new Viewpoint(initialLocation, 300000);

            // Create URI to the used feature service.
            Uri serviceUri = new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Energy/Geology/FeatureServer/9");

            // Create new FeatureLayer by URL.
            FeatureLayer geologyLayer = new FeatureLayer(serviceUri);

            // Add layer to the map.
            myMap.OperationalLayers.Add(geologyLayer);

            // Show the map.
            _myMapView.Map = myMap;
        }

        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;

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

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