Feature layer (feature service)

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Sample viewer app

Show features from an online feature service.

Feature layer (feature service)

Use case

Feature services are useful for sharing vector GIS data with clients so that individual features can be queried, displayed, and edited.

How to use the sample

Run the sample and view the feature service as an operational layer on top of the basemap. Zoom and pan around the map to see the features in greater detail.

How it works

  1. Create an AGSServiceFeatureTable from a URL.
  2. Create an AGSFeatureLayer from the service feature table.
  3. Add the feature layer to map's array of operationalLayers.

Relevant API

  • AGSBasemap
  • AGSFeatureLayer
  • AGSMap
  • AGSMapView
  • AGSServiceFeatureTable

Tags

feature table, layer, layers, service

Sample Code

FeatureLayerURLViewController.swift
                                           
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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 FeatureLayerURLViewController: UIViewController {
    @IBOutlet private 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 = ["FeatureLayerURLViewController"]

        // initialize map with basemap
        let map = AGSMap(basemapStyle: .arcGISTerrain)

        // assign map to the map view
        self.mapView.map = map
        self.mapView.setViewpoint(AGSViewpoint(center: AGSPoint(x: -13176752, y: 4090404, spatialReference: .webMercator()), scale: 300000))

        // initialize service feature table using url
        let featureTable = AGSServiceFeatureTable(url: URL(string: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Energy/Geology/FeatureServer/9")!)

        // create a feature layer
        let featureLayer = AGSFeatureLayer(featureTable: featureTable)

        // add the feature layer to the operational layers
        map.operationalLayers.add(featureLayer)
    }
}

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