Web tiled 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 WebTiledLayerViewController: UIViewController {
    @IBOutlet private var mapView: AGSMapView!

    override func viewDidLoad() {
        super.viewDidLoad()

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

        // add web tiled layer at index 0 at start
        self.applyWebTiledLayer(at: 0)
    }

    private func applyWebTiledLayer(at index: Int) {
        // web tiled layer
        let webTiledLayer = self.webTiledLayer(for: index)

        // initialize basemap with web tiled layer
        let basemap = AGSBasemap(baseLayer: webTiledLayer)

        // initialize map with the basemap
        let map = AGSMap(basemap: basemap)

        self.mapView.map = map
    }

    private func webTiledLayer(for index: Int) -> AGSWebTiledLayer {
        // url template for web tiled layer
        let urlTemplate: String

        switch index {
        case 0:
            // toner
            urlTemplate = "https://stamen-tiles-{subDomain}.a.ssl.fastly.net/toner/{level}/{col}/{row}.png"
        case 1:
            // terrain
            urlTemplate = "https://stamen-tiles-{subDomain}.a.ssl.fastly.net/terrain/{level}/{col}/{row}.jpg"
        default:
            // water color
            urlTemplate = "https://stamen-tiles-{subDomain}.a.ssl.fastly.net/watercolor/{level}/{col}/{row}.jpg"
        }

        // sub domains
        let subDomains = ["a", "b", "c", "d"]

        // attribution
        let attribution = """
            Map tiles by <a href="http://stamen.com/">Stamen Design</a>, \
            under <a href="http://creativecommons.org/licenses/by/3.0">CC BY 3.0</a>. \
            Data by <a href="http://openstreetmap.org/">OpenStreetMap</a>, \
            under <a href="http://creativecommons.org/licenses/by-sa/3.0">CC BY SA</a>.
            """

        // initialize web tiled layer
        let webTiledLayer = AGSWebTiledLayer(urlTemplate: urlTemplate, subDomains: subDomains)

        // assign attribution
        webTiledLayer.attribution = attribution

        return webTiledLayer
    }

    @IBAction private func segmentedControlValueChanged(_ sender: UISegmentedControl) {
        // update web tiled layer
        self.applyWebTiledLayer(at: sender.selectedSegmentIndex)
    }
}