Manage sublayers

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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 ManageSublayersViewController: UIViewController, MapImageSublayersViewControllerDelegate {
    @IBOutlet private var mapView: AGSMapView!

    private var workspaceID = "MyDatabaseWorkspaceIDSSR2"
    private var removedMapImageSublayers = [AGSArcGISMapImageSublayer]()
    private var mapImageLayer: AGSArcGISMapImageLayer!

    override func viewDidLoad() {
        super.viewDidLoad()

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

        // instantiate map with basemap
        let map = AGSMap(basemapStyle: .arcGISStreets)

        // initialize map image layer
        let mapImageLayer = AGSArcGISMapImageLayer(url: URL(string: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer")!)

        // add layer to map
        map.operationalLayers.add(mapImageLayer)

        // initial viewpoint
        let envelope = AGSEnvelope(xMin: -13834661.666904, yMin: 331181.323482, xMax: -8255704.998713, yMax: 9118038.075882, spatialReference: .webMercator())

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

        // set the viewpoint on map view
        self.mapView.setViewpoint(AGSViewpoint(targetExtent: envelope))

        // create sublayers from tableSublayerSource
        self.createSublayers()

        // store the map image layer for later use
        self.mapImageLayer = mapImageLayer
    }

    private func createSublayers() {
        // We will create 2 mapImageSublayers from tableSublayerSource with known workspaceID and dataSourceName
        // These sublayers are not yet part of the mapImageLayer's sublayers, so will be shown as part of the
        // removed sublayers array at first

        // create tableSublayerSource from workspaceID and dataSourceName
        let tableSublayerSource1 = AGSTableSublayerSource(workspaceID: self.workspaceID, dataSourceName: "ss6.gdb.rivers")

        // create mapImageSublayer from tableSublayerSource
        let mapImageSublayer1 = AGSArcGISMapImageSublayer(id: 4, source: tableSublayerSource1)

        // assign a renderer to the sublayer
        let renderer1 = AGSSimpleRenderer(symbol: AGSSimpleLineSymbol(style: .solid, color: .blue, width: 1))
        mapImageSublayer1.renderer = renderer1

        // name for the sublayer
        mapImageSublayer1.name = "Rivers"

        // create tableSublayerSource from workspaceID and dataSourceName
        let tableSublayerSource2 = AGSTableSublayerSource(workspaceID: self.workspaceID, dataSourceName: "ss6.gdb.lakes")

        // create mapImageSublayer from tableSublayerSource
        let mapImageSublayer2 = AGSArcGISMapImageSublayer(id: 5, source: tableSublayerSource2)

        // assign a renderer to the sublayer
        let renderer2 = AGSSimpleRenderer(symbol: AGSSimpleFillSymbol(style: .solid, color: .cyan, outline: nil))
        mapImageSublayer2.renderer = renderer2

        // name for the sublayer
        mapImageSublayer2.name = "Lakes"
        removedMapImageSublayers.append(contentsOf: [mapImageSublayer1, mapImageSublayer2])
    }

    // MARK: - MapImageSublayersViewControllerDelegate

    func mapImageSublayersViewController(_ controller: MapImageSublayersViewController, didCloseWith removedMapImageSublayers: [AGSArcGISMapImageSublayer]) {
        self.removedMapImageSublayers = removedMapImageSublayers
    }

    // MARK: - Navigation

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "MapImageSublayersSegue",
            let navigationController = segue.destination as? UINavigationController,
            let controller = navigationController.viewControllers.first as? MapImageSublayersViewController {
            controller.delegate = self
            controller.preferredContentSize = CGSize(width: 300, height: 300)
            controller.mapImageLayer = self.mapImageLayer
            controller.removedMapImageSublayers = self.removedMapImageSublayers
        }
    }
}