Show legend

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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.

import UIKit
import ArcGIS

class MILShowLegendViewController: UIViewController, UIAdaptivePresentationControllerDelegate {
    @IBOutlet private weak var mapView: AGSMapView!
    @IBOutlet private weak var legendBBI: UIBarButtonItem!

    private var map: AGSMap!

    override func viewDidLoad() {
        super.viewDidLoad()

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

        // initialize the map
        self.map = AGSMap(basemapStyle: .arcGISTopographic)

        // create a map image layer using a url
        let mapImageLayer = AGSArcGISMapImageLayer(url: URL(string: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer")!)
        // add the image layer to the map
        self.map.operationalLayers.add(mapImageLayer)

        // create feature table using a url
        let featureTable = AGSServiceFeatureTable(url: URL(string: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Recreation/FeatureServer/0")!)
        // create feature layer using this feature table
        let featureLayer = AGSFeatureLayer(featureTable: featureTable)
        // add feature layer to the map
        self.map.operationalLayers.add(featureLayer)

        self.map.load { [weak self] (error: Error?) in
            if error == nil {
                self?.legendBBI.isEnabled = true
            }
        }

        self.mapView.map = self.map

        // zoom to a custom viewpoint
        self.mapView.setViewpointCenter(AGSPoint(x: -11e6, y: 6e6, spatialReference: .webMercator()), scale: 9e7)
    }

    // MARK: - Navigation

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "LegendTableSegue" {
            let controller = segue.destination as! MILLegendTableViewController
            controller.presentationController?.delegate = self
            controller.preferredContentSize = CGSize(width: 300, height: 200)
            controller.operationalLayers = self.map.operationalLayers
        }
    }

    // MARK: - UIAdaptivePresentationControllerDelegate

    func adaptivePresentationStyle(for controller: UIPresentationController, traitCollection: UITraitCollection) -> UIModalPresentationStyle {
        return UIModalPresentationStyle.none
    }
}