Location snapping

/*
This code example is part of the Mapbox Navigation SDK for iOS demo app,
which you can build and run: https://github.com/mapbox/mapbox-navigation-ios-examples
To learn more about each example in this app, including descriptions and links
to documentation, see our docs: https://docs.mapbox.com/ios/navigation/examples/location-snapping
*/
 
import UIKit
import MapboxNavigation
import MapboxCoreNavigation
import MapboxMaps
 
class LocationSnappingViewController: UIViewController {
 
private lazy var navigationMapView = NavigationMapView(frame: view.bounds)
private let toggleButton = UIButton()
private let passiveLocationManager = PassiveLocationManager()
private lazy var passiveLocationProvider = PassiveLocationProvider(locationManager: passiveLocationManager)
 
private var isSnappingEnabled: Bool = false {
didSet {
toggleButton.backgroundColor = isSnappingEnabled ? .blue : .darkGray
let locationProvider: LocationProvider = isSnappingEnabled ? passiveLocationProvider : AppleLocationProvider()
navigationMapView.mapView.location.overrideLocationProvider(with: locationProvider)
passiveLocationProvider.startUpdatingLocation()
}
}
 
override func viewDidLoad() {
super.viewDidLoad()
 
setupNavigationMapView()
setupSnappingToggle()
}
 
private func setupNavigationMapView() {
navigationMapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
navigationMapView.userLocationStyle = .puck2D()
 
let navigationViewportDataSource = NavigationViewportDataSource(navigationMapView.mapView)
navigationViewportDataSource.options.followingCameraOptions.zoomUpdatesAllowed = false
navigationViewportDataSource.followingMobileCamera.zoom = 17.0
navigationMapView.navigationCamera.viewportDataSource = navigationViewportDataSource
 
view.addSubview(navigationMapView)
}
 
private func setupSnappingToggle() {
toggleButton.setTitle("Snap to Roads", for: .normal)
toggleButton.layer.cornerRadius = 5
toggleButton.translatesAutoresizingMaskIntoConstraints = false
isSnappingEnabled = false
toggleButton.addTarget(self, action: #selector(toggleSnapping), for: .touchUpInside)
view.addSubview(toggleButton)
toggleButton.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -50).isActive = true
toggleButton.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor).isActive = true
toggleButton.contentEdgeInsets = UIEdgeInsets(top: 0, left: 5, bottom: 0, right: 5)
toggleButton.sizeToFit()
toggleButton.titleLabel?.font = UIFont.systemFont(ofSize: 25)
}
 
@objc private func toggleSnapping() {
isSnappingEnabled.toggle()
}
}