Set up location-driven geotriggers

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Create a notification every time a given location data source has entered and/or exited a set of features or graphics.

Geotriggers Geotriggers

Use case

Geotriggers can be used to notify users when they have entered or exited a geofence by monitoring a given set of features or graphics. They could be used to display contextual information to museum visitors about nearby exhibits, notify hikers when they have wandered off their desired trail, notify dispatchers when service workers arrive at a scene, or more.

How to use the sample

Observe a virtual walking tour of the Santa Barbara Botanic Garden. Information about the user's current Garden Section, as well as information about nearby points of interest within 10 meters will display or be removed from the UI when the user enters or exits the buffer of each feature.

How it works

  1. Create an AGSLocationGeotriggerFeed with an AGSSimulatedLocationDataSource.
  2. Create an AGSFeatureFenceParameters from an AGSServiceFeatureTable, a buffer distance at which to monitor each feature, an Arcade Expression, and a name for the specific geotrigger.
  3. Create an AGSFenceGeotrigger with the geotrigger feed, an AGSFenceRuleType, and the fence parameters.
  4. Create an AGSGeotriggerMonitor with the fence geotrigger and call start(completion:) method to begin observing for notifications that meet the AGSFenceRuleType.
  5. When a notification is posted, capture the AGSFenceGeotriggerNotificationInfo.
  6. For more information about the feature that triggered the notification, access the fenceGeoElement property of the AGSFenceGeotriggerNotificationInfo.
  7. Depending on the AGSFenceNotificationType, update information on the UI from the geo-element's attributes.

Relevant API

  • AGSArcadeExpression
  • AGSFeatureFenceParameters
  • AGSFenceGeotrigger
  • AGSFenceGeotriggerNotificationInfo
  • AGSFenceRuleType
  • AGSGeoElement
  • AGSGeotriggerMonitor
  • AGSGeotriggerNotificationInfoKey
  • AGSLocationGeotriggerFeed
  • AGSServiceFeatureTable
  • AGSSimulatedLocationDataSource

About the data

This sample uses the Santa Barbara Botanic Garden Geotriggers Sample ArcGIS Online Web Map which includes a geo-referenced map of the garden as well as select polygon and point features to denote garden sections and points of interest. Description text and attachment images in the feature layers were provided by the Santa Barbara Botanic Garden and more information can be found on the Garden Sections & Displays portion of their website. All assets are used with permission from the Santa Barbara Botanic Garden. For more information, visit the Santa Barbara Botanic Garden website.

Tags

alert, arcade, fence, geofence, geotrigger, location, navigation, notification, notify, routing, trigger

Sample Code

SetUpLocationDrivenGeotriggersViewController.swift
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// Copyright 2021 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
//
//   https://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 SetUpLocationDrivenGeotriggersViewController: UIViewController {
    // MARK: Storyboard views

    /// The map view managed by the view controller.
    @IBOutlet var mapView: AGSMapView! {
        didSet {
            mapView.map = makeMap()
        }
    }
    /// The label to display fence geotrigger notification status.
    @IBOutlet var fenceGeotriggerLabel: UILabel!
    /// The label to display names of the currently nearby features.
    @IBOutlet var nearbyFeaturesLabel: UILabel!

    @IBOutlet var currentSectionBarButtonItem: UIBarButtonItem!
    @IBOutlet var pointOfInterestBarButtonItem: UIBarButtonItem!

    // MARK: Instance properties

    /// A simulated location data source for demo purposes.
    var simulatedLocationDataSource: AGSSimulatedLocationDataSource!

    /// A dictionary for the feature names in each fence geotrigger.
    /// - Key: The name of a fence geotrigger.
    /// - Value: An array of names of features within the fence.
    var featureNamesInFenceGeotrigger: [String: [String]] = [:] {
        didSet {
            currentSectionBarButtonItem.isEnabled = currentSectionName != nil
            pointOfInterestBarButtonItem.isEnabled = !nearbyPOINames.isEmpty
        }
    }

    /// A dictionary for nearby features.
    var nearbyFeatures: [String: AGSArcGISFeature] = [:]
    /// An array of observers for geotrigger monitor notifications.
    var observers: [NSObjectProtocol] = []
    /// An array of geotrigger monitors.
    var geotriggerMonitors: [AGSGeotriggerMonitor] = []

    /// The name of the current garden section feature. If currently not in any
    /// garden section, it will be `nil`.
    var currentSectionName: String? {
        featureNamesInFenceGeotrigger[Self.sectionFenceGeotriggerName]?.last
    }
    /// The names of nearby point-of-interest features.
    var nearbyPOINames: [String] {
        featureNamesInFenceGeotrigger[Self.poiFenceGeotriggerName] ?? []
    }

    // MARK: Methods

    /// Create a map.
    func makeMap() -> AGSMap {
        // Load a map with predefined tile basemap, feature styles, and labels.
        let map = AGSMap(item: AGSPortalItem(portal: .arcGISOnline(withLoginRequired: false), itemID: "6ab0e91dc39e478cae4f408e1a36a308"))
        map.load { [weak self] _ in
            guard let self = self else { return }

            // Set up location display with a simulated location data source.
            let locationDataSource = self.makeDataSource(polylineJSONString: Self.walkingTourPolylineJSON)
            self.simulatedLocationDataSource = locationDataSource
            self.startDisplayingLocation(using: locationDataSource)

            // Get the service feature tables from the map's operational layers.
            if let operationalLayers = map.operationalLayers as? [AGSFeatureLayer],
               let gardenSectionsLayer = operationalLayers.first(where: { $0.item?.itemID == "1ba816341ea04243832136379b8951d9" }),
               let gardenPOIsLayer = operationalLayers.first(where: { $0.item?.itemID == "7c6280c290c34ae8aeb6b5c4ec841167" }),
               let gardenSections = gardenSectionsLayer.featureTable as? AGSServiceFeatureTable,
               let gardenPOIs = gardenPOIsLayer.featureTable as? AGSServiceFeatureTable {
                // Create geotriggers for each of the service feature tables.
                let geotriggerFeed = AGSLocationGeotriggerFeed(locationDataSource: locationDataSource)
                self.startMonitoring(feed: geotriggerFeed, featureTable: gardenSections, bufferDistance: 0.0, fenceGeotriggerName: Self.sectionFenceGeotriggerName)
                self.startMonitoring(feed: geotriggerFeed, featureTable: gardenPOIs, bufferDistance: 10.0, fenceGeotriggerName: Self.poiFenceGeotriggerName)
            }
        }
        return map
    }

    /// Create a simulated location data source from a GeoJSON.
    func makeDataSource(polylineJSONString: String) -> AGSSimulatedLocationDataSource {
        let simulatedDataSource = AGSSimulatedLocationDataSource()
        let jsonObject = try? JSONSerialization.jsonObject(with: polylineJSONString.data(using: .utf8)!)
        let routePolyline = try? AGSPolyline.fromJSON(jsonObject!) as? AGSPolyline
        // Densify the polyline to control the simulation speed.
        let densifiedRoute = AGSGeometryEngine.geodeticDensifyGeometry(
            routePolyline!,
            maxSegmentLength: 50.0,
            lengthUnit: .meters(),
            curveType: .geodesic
        ) as! AGSPolyline
        simulatedDataSource.setLocationsWith(densifiedRoute)
        return simulatedDataSource
    }

    /// Create a geotrigger monitor and start observing its notifications.
    /// - Parameters:
    ///   - feed: The `AGSGeotriggerFeed` that is monitored for changes.
    ///   - featureTable: The `AGSFeatureTable` that contains the features to use
    ///    in the `AGSFeatureFenceParameters`.
    ///   - bufferDistance: A buffer distance in meters to apply to the features
    ///   when checking if an `AGSFenceGeotrigger` condition is met.
    ///   - fenceGeotriggerName: The name for the `AGSFenceGeotrigger`.
    func startMonitoring(feed: AGSGeotriggerFeed, featureTable: AGSServiceFeatureTable, bufferDistance: Double, fenceGeotriggerName: String) {
        let fenceParameters = AGSFeatureFenceParameters(featureTable: featureTable, bufferDistance: bufferDistance)
        // The Arcade expression in the fence geotrigger returns the value for
        // the "name" field of the feature that triggered the monitor.
        let fenceGeotrigger = AGSFenceGeotrigger(
            feed: feed,
            ruleType: .enterOrExit,
            fenceParameters: fenceParameters,
            messageExpression: AGSArcadeExpression(expression: "$fenceFeature.name"),
            name: fenceGeotriggerName
        )

        // Create and start the geotrigger monitor.
        let geotriggerMonitor = AGSGeotriggerMonitor(geotrigger: fenceGeotrigger)
        geotriggerMonitor.start()
        geotriggerMonitors.append(geotriggerMonitor)

        // Observe geotrigger notifications.
        let observer = NotificationCenter.default.addObserver(
            forName: .AGSGeotriggerMonitorDidTrigger,
            object: geotriggerMonitor,
            queue: nil,
            using: { [weak self] note in self?.handleGeotriggerNotification(note) }
        )
        observers.append(observer)
    }

    /// Handle the notifications posted by `AGSGeotriggerMonitor` when the fence
    /// geotrigger condition has been met.
    func handleGeotriggerNotification(_ notification: Notification) {
        // `AGSFenceGeotriggerNotificationInfo` provides information about the
        // geotrigger monitor and the (fence) geotrigger that was triggered.
        guard let fenceNotificationInfo = notification.userInfo?[AGSGeotriggerNotificationInfoKey] as? AGSFenceGeotriggerNotificationInfo else { return }

        // The feature name from the Arcade expression.
        let featureName = fenceNotificationInfo.message
        let fenceFeature = fenceNotificationInfo.fenceGeoElement as! AGSArcGISFeature
        let geotriggerName = fenceNotificationInfo.geotriggerMonitor.geotrigger.name

        DispatchQueue.main.async { [weak self] in
            guard let self = self else { return }
            switch fenceNotificationInfo.fenceNotificationType {
            case .entered:
                // The user enters a geofence: add the feature for future querying.
                self.featureNamesInFenceGeotrigger[geotriggerName, default: []].append(featureName)
                self.nearbyFeatures[featureName] = fenceFeature
            case .exited:
                // The user leaves the geofence: remove the feature from the dicts.
                if let poppedFeatureName = self.featureNamesInFenceGeotrigger[geotriggerName]?.popLast() {
                    self.nearbyFeatures.removeValue(forKey: poppedFeatureName)
                }
            @unknown default:
                fatalError("Unexpected fence notification type.")
            }

            // Update status labels.
            self.updateStatusLabels(featureName: featureName, notificationType: fenceNotificationInfo.fenceNotificationType)
        }
    }

    // MARK: UI

    func startDisplayingLocation(using locationDataSource: AGSLocationDataSource) {
        mapView.locationDisplay.dataSource = locationDataSource
        mapView.locationDisplay.autoPanMode = .recenter
        mapView.locationDisplay.initialZoomScale = 1000
        mapView.locationDisplay.start()
    }

    func updateStatusLabels(featureName: String, notificationType: AGSFenceNotificationType) {
        let typeString = notificationType == .entered ? "Entered" : "Exited"
        let fenceGeotriggerText = String(format: "%@ the geofence of %@", typeString, featureName)
        let nearbyFeaturesText: String
        if nearbyFeatures.keys.isEmpty {
            nearbyFeaturesText = "No nearby features."
        } else {
            nearbyFeaturesText = String(format: "Nearby: %@", ListFormatter.localizedString(byJoining: nearbyFeatures.keys.sorted()))
        }
        fenceGeotriggerLabel.text = fenceGeotriggerText
        nearbyFeaturesLabel.text = nearbyFeaturesText
    }

    func showPopups(for features: [AGSArcGISFeature]) {
        let popups = features.map(AGSPopup.init)
        let popupsViewController = AGSPopupsViewController(popups: popups)
        popupsViewController.delegate = self
        // Display the view controller as a formsheet - specified for iPads.
        popupsViewController.modalPresentationStyle = .formSheet
        popupsViewController.isModalInPresentation = true
        // Present the popups view controller.
        present(popupsViewController, animated: true) {
            // Stop location updates when it is presented.
            self.mapView.locationDisplay.stop()
        }
    }

    // MARK: Actions

    @IBAction func currentSectionButtonTapped(_ sender: UIBarButtonItem) {
        let sectionFeature = nearbyFeatures[currentSectionName!]!
        showPopups(for: [sectionFeature])
    }

    @IBAction func pointOfInterestButtonTapped(_ sender: UIBarButtonItem) {
        let poiFeatures = nearbyPOINames
            .compactMap { nearbyFeatures[$0] }
            .sorted { ($0.attributes["name"] as! String) < ($1.attributes["name"] as! String) }
        showPopups(for: poiFeatures)
    }

    // MARK: UIViewController

    override func viewDidLoad() {
        super.viewDidLoad()
        // Add the source code button item to the right of navigation bar.
        (navigationItem.rightBarButtonItem as? SourceCodeBarButtonItem)?.filenames = ["SetUpLocationDrivenGeotriggersViewController"]
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        // Restart the simulated location updates.
        if simulatedLocationDataSource != nil {
            mapView.locationDisplay.start()
        }
        geotriggerMonitors.forEach { monitor in
            if monitor.status == .stopped {
                monitor.start()
                // Observe geotrigger notifications.
                let observer = NotificationCenter.default.addObserver(
                    forName: .AGSGeotriggerMonitorDidTrigger,
                    object: monitor,
                    queue: nil,
                    using: { [weak self] note in self?.handleGeotriggerNotification(note) }
                )
                observers.append(observer)
            }
        }
    }

    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)
        // Stop location updates when the view disappears.
        mapView.locationDisplay.stop()
        geotriggerMonitors.forEach { $0.stop() }
        observers.forEach(NotificationCenter.default.removeObserver)
        observers.removeAll(keepingCapacity: true)
        // Clear all received "entered" notifications.
        featureNamesInFenceGeotrigger.removeAll(keepingCapacity: true)
    }
}

// MARK: - AGSPopupsViewControllerDelegate

extension SetUpLocationDrivenGeotriggersViewController: AGSPopupsViewControllerDelegate {
    func popupsViewControllerDidFinishViewingPopups(_ popupsViewController: AGSPopupsViewController) {
        // Dismiss the popups view controller.
        dismiss(animated: true)
        // Restart the simulated location updates.
        mapView.locationDisplay.autoPanMode = .recenter
        mapView.locationDisplay.start()
    }
}

// MARK: - Constants

extension SetUpLocationDrivenGeotriggersViewController {
    static let sectionFenceGeotriggerName = "Section Fence Geotrigger"
    static let poiFenceGeotriggerName = "POI Fence Geotrigger"

    /// A path in Santa Barbara Botanic Garden in GeoJSON format.
    static let walkingTourPolylineJSON = #"{"paths":[[[-119.709881177746,34.4570041646846],[-119.709875813328,34.4570152227745],[-119.709869107805,34.4570240692453],[-119.709859720074,34.4570351273326],[-119.709853014551,34.4570539260775],[-119.709847650133,34.4570760422426],[-119.709848991238,34.4570926293626],[-119.70985569676,34.4571103222869],[-119.709873131119,34.4571202745552],[-119.709889224373,34.4571302268223],[-119.709902635418,34.4571357558591],[-119.709910682045,34.4571600836165],[-119.709910682045,34.4571744591062],[-119.709902635418,34.4571833055602],[-119.709889224373,34.4571910462067],[-119.70988251885,34.4571965752394],[-119.70988251885,34.4572032100782],[-119.709889224373,34.4572175855605],[-119.709898612104,34.4572264320099],[-119.709912023149,34.4572341726524],[-119.709901294313,34.4572419132941],[-119.709895929895,34.4572507597409],[-119.709897271,34.4572596061868],[-119.709902635418,34.4572728758539],[-119.709902635418,34.4572828281028],[-119.70990934094,34.457294991961],[-119.709912023149,34.4573038384022],[-119.709886542164,34.4573115790375],[-119.709861061178,34.4573248486963],[-119.709843626819,34.4573414357669],[-119.709836921297,34.4573668692686],[-119.709843626819,34.4573934085666],[-119.709827533565,34.4574055724087],[-119.709791323744,34.4574188420525],[-119.709749749504,34.4574332174977],[-119.709709516369,34.4574431697275],[-119.709734997354,34.4574807670294],[-119.709748062646,34.4575248306656],[-119.709757450378,34.4575635337324],[-119.709770861423,34.457600025179],[-119.709785613572,34.4576387282109],[-119.70980573014,34.4576730080242],[-119.709815117871,34.4577117110223],[-119.709821823394,34.4577504140025],[-119.709821823394,34.4577869053674],[-119.709821823394,34.4578256083127],[-119.70981780008,34.4578609938471],[-119.709819141185,34.457906331541],[-119.70981460448,34.4579890675855],[-119.709818627793,34.4580675790658],[-119.70982667442,34.4581118108532],[-119.709832038838,34.4581471962662],[-119.709834721047,34.4581947453913],[-119.709836062152,34.4582323423548],[-119.709834721047,34.4582787856393],[-119.709805216748,34.4583429215611],[-119.709759619195,34.4584026342716],[-119.709700610597,34.4584612411497],[-119.709645400048,34.4585103926263],[-119.709566274882,34.4585457778704],[-119.709493855239,34.4585944325566],[-119.709458986522,34.458622077252],[-119.709424117805,34.4586198656767],[-119.709386566878,34.4586110193749],[-119.70935438037,34.4586110193749],[-119.709339628221,34.4586231830396],[-119.709324876071,34.4586585682359],[-119.709306100608,34.4586862129101],[-119.709269890786,34.4587171749343],[-119.709244409801,34.4587238096523],[-119.709229657651,34.4587293385835],[-119.709212223293,34.4587459253751],[-119.70919076562,34.4587945799446],[-119.709174672366,34.4588503400161],[-119.709157238008,34.4589288506865],[-119.709153214694,34.4589951976744],[-119.709155896903,34.4590449578807],[-119.70916394353,34.4590958238387],[-119.709186742307,34.4591323146156],[-119.709218928815,34.4591621706939],[-119.709237704278,34.4591831805204],[-119.709241727592,34.4592252001575],[-119.709238133851,34.459258658624],[-119.709219358388,34.4592796684262],[-119.709207288447,34.4592962551085],[-119.709208629552,34.4593084186733],[-119.709271661463,34.4593791884701],[-119.709310553494,34.4594267368937],[-119.709330670062,34.4594510639836],[-119.709353468838,34.4595008239182],[-119.70936285657,34.4595362087426],[-119.709423221989,34.4595943612845],[-119.709455408497,34.4596297460692],[-119.709487595005,34.459665130839],[-119.709507711573,34.4596817174446],[-119.709523804827,34.4596861405389],[-119.709557332439,34.4596894578594],[-119.709586836739,34.4596894578594],[-119.709593542261,34.4596772943501],[-119.709590860052,34.4596496500041],[-119.709572084589,34.4595777746615],[-119.709566720171,34.4595313320996],[-119.709578790112,34.4595136396883],[-119.709590860052,34.4594992646013],[-119.709627069874,34.4594882068404],[-119.709675349636,34.4595567649343],[-119.709735699339,34.4596197941001],[-119.709775932474,34.4596795058974],[-119.709802754564,34.4597126790997],[-119.709832258863,34.4597359003334],[-119.70986712758,34.4597171021923],[-119.70986980979,34.4596839289918],[-119.709865786476,34.4596308518435],[-119.709876515312,34.4595788804365],[-119.70988187973,34.4595346494263],[-119.709879197521,34.4594926299449],[-119.709852375431,34.4594539277723],[-119.709806777878,34.4593953215911],[-119.709767885847,34.4593212344729],[-119.709720947189,34.4592195028005],[-119.709708720088,34.4591478732967],[-119.709710061193,34.4591058536206],[-119.709707378984,34.459079314867],[-119.709652393699,34.4590262373344],[-119.709617524982,34.4589499383221],[-119.709626771268,34.4588695962162],[-119.709683097658,34.4588032491285],[-119.709730036316,34.4587391135603],[-119.709759540615,34.4586993052518],[-119.7097850216,34.4586650258598],[-119.710059948024,34.4587744987075],[-119.710104204473,34.4587932970608],[-119.710128443889,34.4587649224307],[-119.71019415801,34.4587096331253],[-119.710273283176,34.4586731421637],[-119.71031619852,34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}

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