Set initial map area

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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 SetInitialMapAreaViewController: UIViewController {
    @IBOutlet weak 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 = ["SetInitialMapAreaViewController"]

        // Initialize the map with imagery basemap.
        let map = AGSMap(basemapStyle: .arcGISImageryStandard)

        // Assign the map to the map view.
        mapView.map = map

        // Set the map view's viewpoint.
        let envelope = AGSEnvelope(xMin: -12211308.778729, yMin: 4645116.003309, xMax: -12208257.879667, yMax: 4650542.535773, spatialReference: .webMercator())
        mapView.setViewpoint(AGSViewpoint(targetExtent: envelope))
    }
}