Show a callout with the latitude and longitude of user-tapped points.
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
Use AGSGeoViewTouchDelegate.geoView(_:didTapAtScreenPoint:mapPoint:) to get the mapPoint where a user tapped on the map.
Create a string to display the coordinates; note that latitude and longitude in WGS84 map to the Y and X coordinates.
Create a new callout definition using a title string as title and the coordinate string as detail.
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
classCalloutViewController: UIViewController, AGSGeoViewTouchDelegate{
@IBOutletvar 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 }
}
overridefuncviewDidLoad() {
super.viewDidLoad()
// Add the source code button item to the right of navigation bar. (navigationItem.rightBarButtonItem as?SourceCodeBarButtonItem)?.filenames = ["CalloutViewController"]
}
// MARK: - AGSGeoViewTouchDelegatefuncgeoView(_geoView: AGSGeoView, didTapAtScreenPointscreenPoint: 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()
}
}
}