Include an overview or inset map as an additional map view to show the wider context of the primary view.
Use case
An overview map provides a useful, smaller-scale overview of the current map view's location. For example, when you need to inspect a layer with many features while remaining aware of the wider context of the view, use an overview map to help show the extent of the main map view.
How to use the sample
Pan or zoom across the map view to browse through the tourist attractions feature layer and watch the viewpoint or scale of the linked overview map update automatically.
How it works
Create a Map with the arcGISTopographic basemap style.
Create a MapView instance with the map.
Instantiate a FeatureLayer and add it to the map's operational layers.
Create an OverviewMap object using the toolkit.
Add the OverviewMap to the map view as an overlay.
context, inset, map, minimap, overview, preview, small scale, toolkit, view
Sample Code
DisplayOverviewMapView.swift
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// Copyright 2022 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 SwiftUI
import ArcGIS
import ArcGISToolkit
structDisplayOverviewMapView: View{
/// A map with imagery basemap and a tourist attraction feature layer.@StateObjectprivatevar map = makeMap()
/// The current viewpoint of the map view.@Stateprivatevar viewpoint =Viewpoint(
center: Point(x: -123.12052, y: 49.28299, spatialReference: .wgs84),
scale: 1e5 )
/// The visible area marked with a red rectangle on the overview map.@Stateprivatevar visibleArea: ArcGIS.Polygon?
/// Creates a map.privatestaticfuncmakeMap() -> Map {
let featureLayer =FeatureLayer(
item: PortalItem(
portal: .arcGISOnline(connection: .anonymous),
id: .northAmericaTouristAttractions
)
)
let map =Map(basemapStyle: .arcGISTopographic)
map.addOperationalLayer(featureLayer)
return map
}
var body: someView {
MapView(map: map, viewpoint: viewpoint)
.onViewpointChanged(kind: .centerAndScale) { viewpoint =$0 }
.onVisibleAreaChanged { visibleArea =$0 }
.overlay(alignment: .topTrailing) {
OverviewMap.forMapView(
with: viewpoint,
visibleArea: visibleArea
)
.frame(width: 200, height: 132)
.padding()
}
}
}
privateextensionPortalItem.ID{
staticvar northAmericaTouristAttractions: Self { Self("97ceed5cfc984b4399e23888f6252856")! }
}
