So, I have tracked down the issue, but I have no idea why it's happening. I combined two sample/tutorial items, the GraphicsOverlay example and an example I found to manage layers. When I first tried this sample, the toolbar was not showing and the Internet told me I needed to have a NavigationStack. After I put that in there, the toolbar started working. Then I added the GraphicsOverlay to the MapView and the crash happened. I stripped back all the code this morning to find the issue was having the MapView inside of a NavigationStack. I have since removed the NavigationStack and the .toolbar still works, so I'm not sure why it wasn't working before or why the NavigationStack caused it to work. Here's an example (with the GraphicsOverlay param on the MapView commented out, uncomment to get the crash). Again, I have never used SwiftUI before, so maybe there's some reasonable explanation why a MapView with a GraphicsOverlay can't live inside of a NavigationStack.
//
// ContentView.swift
//
import SwiftUI
import ArcGIS
private class Model: ObservableObject {
let map: Map = {
let map = Map(basemapStyle: .arcGISTopographic)
map.initialViewpoint = Viewpoint(latitude: 34.027, longitude: -118.805, scale: 72_000)
return map
}()
let graphicsOverlay: GraphicsOverlay = {
// Create a graphics overlay.
let overlay = GraphicsOverlay()
// Create a point for the graphic location.
let pierLocation = Point(x: -118.4978, y: 34.0086, spatialReference: .wgs84)
// Create a red circle symbol.
let redCircleSymbol = SimpleMarkerSymbol(style: .circle, color: .red, size: 10)
// Create a graphic using the point and the symbol.
let pierGraphic = Graphic(geometry: pierLocation, symbol: redCircleSymbol)
// Add the graphic to the graphics overlay.
overlay.addGraphic(pierGraphic)
return overlay
}()
}
struct ContentView: View {
@Environment(\.managedObjectContext) private var viewContext
@StateObject private var model = Model()
@State private var isShowingSheet = false
var body: some View {
NavigationStack
{
MapView(map: model.map)//, graphicsOverlays: [model.graphicsOverlay])
.toolbar
{
ToolbarItem(placement: .bottomBar)
{
Button("Manage Layers")
{
self.isShowingSheet = true
}
.sheet(isPresented: $isShowingSheet)
{
ManageLayersSheetView(map: self.model.map)
}
.presentationDetents([.medium] )
.presentationDragIndicator(.visible )
}
}
}
}
}
struct ManageLayersSheetView: View {
/// The map with the operational layers.
let map: Map
/// The action to dismiss the manage layers sheet.
@Environment(\.dismiss) private var dismiss
/// An array for all the layers currently on the map.
@State private var operationalLayers: [Layer] = []
/// An array for all the layers removed from the map.
@State private var removedLayers: [Layer] = []
var body: some View {
VStack {
ZStack {
Text("Manage Layers")
.bold()
HStack {
Spacer()
EditButton()
}
}
.padding([.top, .leading, .trailing])
List {
Section {
ForEach(operationalLayers, id: \.id) { layer in
HStack {
Image(systemName: "minus.circle.fill")
.foregroundColor(.red)
.imageScale(.large)
.clipped()
.onTapGesture {
// Remove layer from map on minus press.
map.removeOperationalLayer(layer)
removedLayers.append(layer)
operationalLayers.removeAll(where: { $0.id == layer.id })
}
Text(layer.name)
}
}
.onMove { fromOffsets, toOffset in
// Reorder the map's operational layers on list row move.
operationalLayers.move(fromOffsets: fromOffsets, toOffset: toOffset)
map.removeAllOperationalLayers()
map.addOperationalLayers(operationalLayers)
}
} header: {
Text("Operational Layers")
#if targetEnvironment(macCatalyst)
.padding(.top)
#endif
} footer: {
Text("Tap \"Edit\" to reorder the layers.")
}
Section {
ForEach(removedLayers, id: \.id) { layer in
HStack {
Image(systemName: "plus.circle.fill")
.foregroundColor(.green)
.imageScale(.large)
.clipped()
.onTapGesture {
// Add layer to map on plus press.
map.addOperationalLayer(layer)
operationalLayers.append(layer)
removedLayers.removeAll(where: { $0.id == layer.id })
}
Text(layer.name)
}
}
} header: {
Text("Removed Layers")
}
}
}
.background(Color(.systemGroupedBackground))
.onAppear {
operationalLayers = map.operationalLayers
}
}
}
