Display annotation

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// Copyright 2019 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 ArcGISRuntime;
using Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using System;
using UIKit;

namespace ArcGISRuntimeXamarin.Samples.DisplayAnnotation
{
    [Register("DisplayAnnotation")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Display annotation",
        category: "Layers",
        description: "Display annotation from a feature service URL.",
        instructions: "Pan and zoom to see names of waters and burns in a small region of Scotland.",
        tags: new[] { "annotation", "cartography", "labels", "placement", "reference scale", "text", "utility" })]
    public class DisplayAnnotation : UIViewController
    {
        // Hold references to UI controls.
        private MapView _myMapView;

        public DisplayAnnotation()
        {
            Title = "Display annotation";
        }

        private void Initialize()
        {
            // Uris for the river data.
            Uri riverFeatureServiceUri = new Uri("https://services1.arcgis.com/6677msI40mnLuuLr/arcgis/rest/services/East_Lothian_Rivers/FeatureServer/0");
            Uri riverFeatureLayerUri = new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/RiversAnnotation/FeatureServer/0");

            // Create a map.
            Map map = new Map(BasemapStyle.ArcGISLightGray);
            map.InitialViewpoint = new Viewpoint(55.882436, -2.725610, 50000);

            // Create a feature layer from a feature service.
            FeatureLayer riverFeatureLayer = new FeatureLayer(new ServiceFeatureTable(riverFeatureServiceUri));

            // Add the feature layer to the map.
            map.OperationalLayers.Add(riverFeatureLayer);

            // Create an annotation layer from a feature service.
            AnnotationLayer annotationLayer = new AnnotationLayer(riverFeatureLayerUri);

            // Add the annotation layer to the map.
            map.OperationalLayers.Add(annotationLayer);

            // Set the map to the map view.
            _myMapView.Map = map;
        }

        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)
            });
        }

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