Show callout

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Show a callout with the latitude and longitude of user-tapped points.

Image of show callout

Use case

Callouts are used to display temporary detail content on a map. You can display text and arbitrary UI controls in callouts.

How to use the sample

Tap anywhere on the map. A callout showing the WGS84 coordinates for the tapped point will appear. Tap again to hide it.

How it works

  1. Use AGSGeoViewTouchDelegate.geoView(_:didTapAtScreenPoint:mapPoint:) to get the mapPoint where a user tapped on the map.
  2. Create a string to display the coordinates; note that latitude and longitude in WGS84 map to the Y and X coordinates.
  3. Create a new callout definition using a title string as title and the coordinate string as detail.
  4. Display the callout by calling AGSCallout.show(at:screenOffset:rotateOffsetWithMap:animated:) on the map view with the location and the callout definition.

Relevant API

  • AGSCallout
  • AGSGeoViewTouchDelegate

Tags

balloon, bubble, callout, flyout, flyover, info window, popup, tap

Sample Code

CalloutViewController.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 CalloutViewController: UIViewController, AGSGeoViewTouchDelegate {
    @IBOutlet var mapView: AGSMapView! {
        didSet {
            // Initialize map with topographic basemap.
            mapView.map = AGSMap(basemapStyle: .arcGISTopographic)

            // Set the map view's touch delegate to `self` in order to get
            // tap notifications.
            mapView.touchDelegate = self

            // Set the map view's viewpoint.
            mapView.setViewpointCenter(AGSPoint(x: -1.2e7, y: 5e6, spatialReference: .webMercator()), scale: 4e7)

            // Configure the map view's callout to hide accessory button.
            mapView.callout.isAccessoryButtonHidden = true
        }
    }

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

    // MARK: - AGSGeoViewTouchDelegate

    func geoView(_ geoView: AGSGeoView, didTapAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
        // User tapped on the map.
        if mapView.callout.isHidden {
            // Show the callout with the coordinates of the tapped location.
            mapView.callout.title = "Location"
            // Project the tapped location point to WGS 84 spatial reference.
            let location = AGSGeometryEngine.projectGeometry(mapPoint, to: .wgs84()) as! AGSPoint
            mapView.callout.detail = String(format: "x: %.2f, y: %.2f", location.x, location.y)
            mapView.callout.show(at: mapPoint, screenOffset: .zero, rotateOffsetWithMap: false, animated: true)
        } else {
            // Hide the callout.
            mapView.callout.dismiss()
        }
    }
}

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