Draw Route Line on NavigationMapView

Specify a source and destination and watch as the requested route is displayed on the map, enabling users to visualize their journey.

This example shows how to request and draw a route in the NavigationMapView:

  • It first requests a simple route from the given source and destination location

  • Then the given route will be shown in the NavigationMapView

documentation image

For all code examples, refer to Navigation Code Examples

DrawRouteLineViewController view source

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import UIKit
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import NbmapNavigation
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import NbmapCoreNavigation
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import NbmapDirections
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import Nbmap
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class DrawRouteLineViewController: UIViewController, NGLMapViewDelegate {
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var navigationMapView: NavigationMapView? {
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didSet {
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oldValue?.removeFromSuperview()
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if let navigationMapView = navigationMapView {
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view.insertSubview(navigationMapView, at: 0)
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}
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}
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}
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var routes : [Route] = []
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override func viewDidLoad() {
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super.viewDidLoad()
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let origin = CLLocation(latitude: 37.77440680146262, longitude: -122.43539772352648)
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let destination = CLLocation(latitude: 37.76556957793795, longitude: -122.42409811526268)
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self.navigationMapView = NavigationMapView(frame: view.bounds)
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navigationMapView?.userTrackingMode = .followWithHeading
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navigationMapView?.delegate = self
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self.view.setNeedsLayout()
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requestRoutes(origin: origin, destination: destination)
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}
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func requestRoutes(origin: CLLocation, destination: CLLocation){
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let options = NavigationRouteOptions(origin: origin, destination: destination)
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/**
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Sets whether the route contains an alternate route
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By default , it set to `false`
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*/
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options.includesAlternativeRoutes = false
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/**
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The route classes that the calculated routes will avoid.
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We can set an array road class to avoid. This property can be set to `.toll`,`.ferry`,`.highway`
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By default , this property is set to empty
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*/
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options.roadClassesToAvoid = [.toll,.ferry,.highway]
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/**
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Set up the navigation measurement unit
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This property should be set to `.metric` or `.imperial`
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By default , this property is set to the unit follow with current system locale.
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*/
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options.distanceMeasurementSystem = .imperial
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/**
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Set specifying the primary mode of transportation for the routes.
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This property should be set to `NBNavigationModeCar`, `NBNavigationModeAuto`, `NBNavigationModeBike`, `NBNavigationMode4W`,`NBNavigationMode2W`,`NBNavigationMode6W`, or `NBNavigationModeEscooter`. The default value of this property is `NBNavigationMode4W`, which specifies driving directions.
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*/
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options.profileIdentifier = NBNavigationMode.mode4W
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/**
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Set the departureTime of the route , By default , it sets the current timestamp since from 1970
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*/
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options.departureTime = Int(Date().timeIntervalSince1970)
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/**
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Set up the locale in which the route's instructions are written.
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If you use NbmapDirections.swift with the Nbmap Directions API, this property affects the sentence contained within the `RouteStep.instructions` property, but it does not affect any road names contained in that property or other properties such as `RouteStep.name`.
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The Navigation API can provide instructions in [a number of languages]. Set this property to `Bundle.main.preferredLocalizations.first` or `Locale.autoupdatingCurrent` to match the application's language or the system language, respectively.
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By default, this property is set to the current system locale.
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*/
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options.locale = Locale.autoupdatingCurrent
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/**
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Set map options, This property may make the ETA more accurate. If set to `NBMapOption.valhala`, shapeFormat needs to be set to `polyline`.
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By default , the value of this property is `NBMapOption.none`
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*/
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options.mapOption = NBMapOption.none
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/**
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Format of the data from which the shapes of the returned route and its steps are derived.
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This property has no effect on the returned shape objects, although the choice of format can significantly affect the size of the underlying HTTP response.
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The default value of this property is `polyline6`.
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*/
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options.shapeFormat = .polyline6
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Directions.shared.calculate(options) { [weak self] routes, error in
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guard let weakSelf = self else {
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return
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}
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guard error == nil else {
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print(error!)
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return
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}
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guard let routes = routes else { return }
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weakSelf.navigationMapView?.showRoutes(routes)
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guard let current = routes.first else { return }
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weakSelf.navigationMapView?.showWaypoints(current)
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weakSelf.routes = routes
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}
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}
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}

The code first imports the following frameworks:

  • UIKit

  • NbmapNavigation

  • NbmapCoreNavigation

  • NbmapDirections

  • Nbmap

These frameworks provide the necessary functionality to create a map view, request routes, and draw the routes on the map.

The next part of the code defines a class called DrawRouteLineViewController. This class inherits from UIViewController and implements the NGLMapViewDelegate protocol.

The DrawRouteLineViewController class has the following properties:

  • navigationMapView: A NavigationMapView object that is used to display the map.

  • routes: An array of Route objects that contain the route information.

The DrawRouteLineViewController class also has the following methods:

  • viewDidLoad(): This method is called when the view controller is loaded. It initializes the map view and requests routes from the Directions API.

  • requestRoutes(): This method requests routes from the Directions API. The method takes two parameters: the origin location and the destination location.

  • directionsDidCalculate(): This method is called when the Directions API finishes calculating the routes. The method takes two parameters: an array of Route objects and an error object.

  • showRoutes(): This method displays the routes on the map.

  • showWaypoints(): This method displays the waypoints on the map.

The DrawRouteLineViewController class can be used to create a map view that displays a route between two locations. The route can be customized by setting the options property of the requestRoutes() method.

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