Service feature table (on interaction cache)

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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.UI.Controls;
using Foundation;
using System;
using UIKit;

namespace ArcGISRuntime.Samples.ServiceFeatureTableCache
{
    [Register("ServiceFeatureTableCache")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Service feature table (on interaction cache)",
        category: "Data",
        description: "Display a feature layer from a service using the **on interaction cache** feature request mode.",
        instructions: "Run the sample and pan and zoom around the map. With each interaction, features will be requested and stored in a local cache. Each subsequent interaction will display features from the cache and only request new features from the service.",
        tags: new[] { "cache", "feature request mode", "performance" })]
    public class ServiceFeatureTableCache : UIViewController
    {
        // Hold references to UI controls.
        private MapView _myMapView;

        public ServiceFeatureTableCache()
        {
            Title = "Service feature table (cache)";
        }

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

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

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

            // Create feature table for the pools feature service.
            ServiceFeatureTable poolsFeatureTable = new ServiceFeatureTable(serviceUri)
            {
                // Define the request mode.
                FeatureRequestMode = FeatureRequestMode.OnInteractionCache
            };

            // Create FeatureLayer that uses the created table.
            FeatureLayer poolsFeatureLayer = new FeatureLayer(poolsFeatureTable);

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

            // Assign the map to the MapView.
            _myMapView.Map = myMap;

            // Feature table initialization.
            poolsFeatureTable.RetryLoadAsync();
        }

        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)
            });
        }
    }
}