Map Controller

import SwiftUI
import MapboxMaps
import MapsGLMaps
import MapsGLMapbox // Needed only if you are using SPM
//import MapsGL // Needed only if you are using CocoaPods
import Combine
 
let xweatherClientID = "FILL_IN_WITH_YOUR_CLIENT_ID"
let xweatherClientSecret = "FILL_IN_WITH_YOUR_CLIENT_SECRET"
let mapboxAccessToken = "FILL_IN_WITH_YOUR_MAPBOX_PUBLIC_ACCESS_TOKEN"
 
struct MyMapView : View {
	class Coordinator {
		/// MapsGL's controller that manages adding/removing MapsGL weather layers to/from the `MapboxMaps.MapView`.
		var mapController: MapboxMapController!
		
		/// Holds Combine subscriptions to MapsGL events and other Combine subscriptions.
		var cancellables: Set<AnyCancellable> = []
	}
	private let coordinator = Coordinator()
	
	var body: some View {
		MapReader { proxy in
			Map(initialViewport: .camera(
					center: CLLocationCoordinate2D(latitude: 50.0, longitude: 10.0),
					zoom: 2.5
			))
			.mapStyle(.dark)
			.ignoresSafeArea()
			.onAppear {
				guard let map = proxy.map else { return }
				
				try! map.setProjection(.init(name: .mercator)) // Set 2D map projection
				
				// Set up the MapsGL `MapboxMapController`, which will handle
				// 	adding/removing MapsGL weather layers to the `MapboxMaps.MapView`.
				let mapController = MapboxMapController(
					map: map,
					window: UIWindow?.none,
					account: XweatherAccount(id: xweatherClientID, secret: xweatherClientSecret)
				)
				coordinator.mapController = mapController
				
				// Once the map has completed initial load…
				mapController.subscribe(to: MapEvents.Load.self) { _ in
					// Add the wind particles layer.
					do {
						var layerConfig = WeatherService.WindParticles(service: mapController.service)
						layerConfig.layer.paint.particle.density = .extreme
						try mapController.addWeatherLayer(config: layerConfig)
					} catch {
						NSLog("Failed to add weather layer: \(error)")
					}
				}.store(in: &coordinator.cancellables)
			}
		}
	}
	
	private static let _staticInit: Void = {
		MapboxOptions.accessToken = mapboxAccessToken
	}()
	private let _staticInit: Void = Self._staticInit
}
 
#Preview {
	MyMapView()
}