Show 3D terrain

import UIKit
import MapboxMaps
 
public class TerrainExample: UIViewController, ExampleProtocol {
 
internal var mapView: MapView!
private var cancelables = Set<AnyCancelable>()
 
override public func viewDidLoad() {
super.viewDidLoad()
 
let centerCoordinate = CLLocationCoordinate2D(latitude: 32.6141, longitude: -114.34411)
let camera = CameraOptions(center: centerCoordinate,
zoom: 13.1,
bearing: 80,
pitch: 85)
let options = MapInitOptions(
cameraOptions: camera,
styleURI: StyleURI(rawValue: "mapbox://styles/mapbox-map-design/ckhqrf2tz0dt119ny6azh975y")!)
 
mapView = MapView(frame: view.bounds, mapInitOptions: options)
mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
 
view.addSubview(mapView)
 
mapView.mapboxMap.onStyleLoaded.observeNext { _ in
self.addTerrain()
// The following line is just for testing purposes.
self.finish()
}.store(in: &cancelables)
}
 
func addTerrain() {
var demSource = RasterDemSource(id: "mapbox-dem")
demSource.url = "mapbox://mapbox.mapbox-terrain-dem-v1"
// Setting the `tileSize` to 514 provides better performance and adds padding around the outside
// of the tiles.
demSource.tileSize = 514
demSource.maxzoom = 14.0
try! mapView.mapboxMap.addSource(demSource)
 
var terrain = Terrain(sourceId: demSource.id)
terrain.exaggeration = .constant(1.5)
 
try! mapView.mapboxMap.setTerrain(terrain)
 
var skyLayer = SkyLayer(id: "sky-layer")
skyLayer.skyType = .constant(.atmosphere)
skyLayer.skyAtmosphereSun = .constant([0.0, 0.0])
skyLayer.skyAtmosphereSunIntensity = .constant(15.0)
 
try! mapView.mapboxMap.addLayer(skyLayer)
}
}