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.

import UIKit
import ArcGIS

class WMTSLayerViewController: UIViewController {
    @IBOutlet private weak var mapView: AGSMapView!

    private var map: AGSMap!
    private var wmtsService: AGSWMTSService!

    private let wmtsServiceURL = URL(string: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/WorldTimeZones/MapServer/WMTS")!

    override func viewDidLoad() {
        super.viewDidLoad()

        // initialize the map
        self.map = AGSMap()

        // assign the map to the map view
        self.mapView.map = self.map

        // create a WMTS service with the service URL
        self.wmtsService = AGSWMTSService(url: wmtsServiceURL)

        // load the WMTS service to access the service information
        self.wmtsService.load { [weak self] (error) in
            guard let self = self else { return }
            if let error = error {
                self.presentAlert(message: "Failed to load WMTS layer: \(error.localizedDescription)")
            } else if let layerInfo = self.wmtsService.serviceInfo?.layerInfos.first {
                // Create a WMTS layer using the first element in the collection
                // of WMTS layer info objects.
                let wmtsLayer = AGSWMTSLayer(layerInfo: layerInfo)
                // Set the basemap of the map with WMTS layer.
                self.map.basemap = AGSBasemap(baseLayer: wmtsLayer)
            }
        }

        // add the source code button item to the right of navigation bar
        (self.navigationItem.rightBarButtonItem as! SourceCodeBarButtonItem).filenames = ["WMTSLayerViewController"]
    }
}