WMTS layer

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// Copyright 2017 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.Mapping;
using Esri.ArcGISRuntime.Ogc;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using System;
using System.Linq;
using System.Threading.Tasks;
using UIKit;

namespace ArcGISRuntime.Samples.WMTSLayer
{
    [Register("WMTSLayer")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "WMTS layer",
        category: "Layers",
        description: "Display a layer from a Web Map Tile Service.",
        instructions: "The layer will be displayed automatically. Use the buttons to choose a different method of loading the layer.",
        tags: new[] { "OGC", "layer", "raster", "tiled", "web map tile service" })]
    public class WMTSLayer : UIViewController
    {
        // Hold references to UI controls.
        private MapView _myMapView;
        private UISegmentedControl _constructorChoiceButton;

        public WMTSLayer()
        {
            Title = "WMTS layer";
        }

        private async void Initialize()
        {
            await LoadWMTSLayerAsync(true);
        }

        private async void _constructorChoiceButton_ValueChanged(object sender, EventArgs e)
        {
            //Load the WMTS layer using service info or URL.
            switch (_constructorChoiceButton.SelectedSegment)
            {
                case 0:
                    await LoadWMTSLayerAsync(true);
                    break;

                case 1:
                    await LoadWMTSLayerAsync(false);
                    break;
            }
        }

        private async Task LoadWMTSLayerAsync(bool uriMode)
        {
            try
            {
                // Create a new map.
                Map myMap = new Map();

                // Get the basemap from the map.
                Basemap myBasemap = myMap.Basemap;

                // Get the layer collection for the base layers.
                LayerCollection myLayerCollection = myBasemap.BaseLayers;

                // Create an instance for the WMTS layer.
                WmtsLayer myWmtsLayer;

                // Define the Uri to the WMTS service.
                Uri wmtsUri = new Uri("https://gibs.earthdata.nasa.gov/wmts/epsg4326/best");

                if (uriMode)
                {
                    // Create a WMTS layer using a Uri and provide an Id value.
                    myWmtsLayer = new WmtsLayer(wmtsUri, "SRTM_Color_Index");
                }
                else
                {
                    // Define a new instance of the WMTS service.
                    WmtsService myWmtsService = new WmtsService(wmtsUri);

                    // Load the WMTS service.
                    await myWmtsService.LoadAsync();

                    // Get the service information (i.e. metadata) about the WMTS service.
                    WmtsServiceInfo myWmtsServiceInfo = myWmtsService.ServiceInfo;

                    // Obtain the read only list of WMTS layer info objects, and select the one with the desired Id value.
                    WmtsLayerInfo info = myWmtsServiceInfo.LayerInfos.Single(l => l.Id == "SRTM_Color_Index");

                    // Create a WMTS layer using WMTS layer info.
                    myWmtsLayer = new WmtsLayer(info);
                }

                // Add the WMTS layer to the layer collection of the map.
                myLayerCollection.Add(myWmtsLayer);

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

                // Zoom to appropriate level for iOS.
                await _myMapView.SetViewpointScaleAsync(300000000);
            }
            catch (Exception ex)
            {
                UIAlertController alert = UIAlertController.Create("Error", ex.Message, UIAlertControllerStyle.Alert);
                alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
                PresentViewController(alert, true, null);
            }
        }

        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;

            _constructorChoiceButton = new UISegmentedControl("URI", "Service Info")
            {
                BackgroundColor = ApplicationTheme.BackgroundColor,
                TranslatesAutoresizingMaskIntoConstraints = false,
                SelectedSegment = 0,
                // Clean up borders of segmented control - avoid corner pixels.
                ClipsToBounds = true,
                Layer = { CornerRadius = 5 }
            };

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

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

                _constructorChoiceButton.LeadingAnchor.ConstraintEqualTo(View.LayoutMarginsGuide.LeadingAnchor),
                _constructorChoiceButton.TrailingAnchor.ConstraintEqualTo(View.LayoutMarginsGuide.TrailingAnchor),
                _constructorChoiceButton.TopAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.TopAnchor, 8)
            });
        }

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

            // Subscribe to events.
            _constructorChoiceButton.ValueChanged += _constructorChoiceButton_ValueChanged;
        }

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

            // Unsubscribe from events, per best practice.
            _constructorChoiceButton.ValueChanged -= _constructorChoiceButton_ValueChanged;
        }
    }
}