NavigationViewControllerDelegate
@objc(MBNavigationViewControllerDelegate)
public protocol NavigationViewControllerDelegate : VisualInstructionDelegate
The NavigationViewControllerDelegate
protocol provides methods for configuring the map view shown by a NavigationViewController
and responding to the cancellation of a navigation session.
-
Called when the navigation view controller is dismissed, such as when the user ends a trip.
Declaration
Swift
@objc optional func navigationViewControllerDidDismiss(_ navigationViewController: NavigationViewController, byCanceling canceled: Bool)
Parameters
navigationViewController
The navigation view controller that was dismissed.
canceled
True if the user dismissed the navigation view controller by tapping the Cancel button; false if the navigation view controller dismissed by some other means.
-
Called as the user approaches a waypoint.
This message is sent, once per progress update, as the user is approaching a waypoint. You can use this to cue UI, to do network pre-loading, etc.
Note
This method will likely be called several times as you approach a destination. To respond to the user’s arrival only once, your delegate can define a property that keeps track of whether this method has already been called for the given waypoint.Declaration
Swift
@objc(navigationViewController:willArriveAtWaypoint:after:distance:) optional func navigationViewController(_ navigationViewController: NavigationViewController, willArriveAt waypoint: Waypoint, after remainingTimeInterval: TimeInterval, distance: CLLocationDistance)
Parameters
navigationViewController
The Navigation VC that is detecting the users’ approach.
waypoint
The waypoint that the service is arriving at.
remainingTimeInterval
The estimated number of seconds until arrival.
distance
The current distance from the waypoint, in meters.
-
Called when the user arrives at the destination waypoint for a route leg.
This method is called when the navigation view controller arrives at the waypoint. You can implement this method to prevent the navigation view controller from automatically advancing to the next leg. For example, you can and show an interstitial sheet upon arrival and pause navigation by returning
false
, then continue the route when the user dismisses the sheet. If this method is unimplemented, the navigation view controller automatically advances to the next leg when arriving at a waypoint.Postcondition
If you returnfalse
within this method, you must manually advance to the next leg: obtain the value of thenavigationService
and itsNavigationService.routeProgress
property, then increment theRouteProgress.legIndex
property.Declaration
Swift
@objc(navigationViewController:didArriveAtWaypoint:) optional func navigationViewController(_ navigationViewController: NavigationViewController, didArriveAt waypoint: Waypoint) -> Bool
Parameters
navigationViewController
The navigation view controller that has arrived at a waypoint.
waypoint
The waypoint that the user has arrived at.
Return Value
True to automatically advance to the next leg, or false to remain on the now completed leg.
-
Returns whether the navigation view controller should be allowed to calculate a new route.
If implemented, this method is called as soon as the navigation view controller detects that the user is off the predetermined route. Implement this method to conditionally prevent rerouting. If this method returns
true
,navigationViewController(_:willRerouteFrom:)
will be called immediately afterwards.Declaration
Swift
@objc(navigationViewController:shouldRerouteFromLocation:) optional func navigationViewController(_ navigationViewController: NavigationViewController, shouldRerouteFrom location: CLLocation) -> Bool
Parameters
navigationViewController
The navigation view controller that has detected the need to calculate a new route.
location
The user’s current location.
Return Value
True to allow the navigation view controller to calculate a new route; false to keep tracking the current route.
-
Called immediately before the navigation view controller calculates a new route.
This method is called after
navigationViewController(_:shouldRerouteFrom:)
is called, simultaneously with theRouteControllerWillReroute
notification being posted, and beforenavigationViewController(_:didRerouteAlong:)
is called.Declaration
Swift
@objc(navigationViewController:willRerouteFromLocation:) optional func navigationViewController(_ navigationViewController: NavigationViewController, willRerouteFrom location: CLLocation?)
Parameters
navigationViewController
The navigation view controller that will calculate a new route.
location
The user’s current location.
-
Called immediately after the navigation view controller receives a new route.
This method is called after
navigationViewController(_:willRerouteFrom:)
and simultaneously with theRouteControllerDidReroute
notification being posted.Declaration
Swift
@objc(navigationViewController:didRerouteAlongRoute:) optional func navigationViewController(_ navigationViewController: NavigationViewController, didRerouteAlong route: Route)
Parameters
navigationViewController
The navigation view controller that has calculated a new route.
route
The new route.
-
Called when the navigation view controller fails to receive a new route.
This method is called after
navigationViewController(_:willRerouteFrom:)
and simultaneously with theRouteControllerDidFailToReroute
notification being posted.Declaration
Swift
@objc(navigationViewController:didFailToRerouteWithError:) optional func navigationViewController(_ navigationViewController: NavigationViewController, didFailToRerouteWith error: Error)
Parameters
navigationViewController
The navigation view controller that has calculated a new route.
error
An error raised during the process of obtaining a new route.
-
Returns an
MGLStyleLayer
that determines the appearance of the route line.If this method is unimplemented, the navigation view controller’s map view draws the route line using an
MGLLineStyleLayer
.Declaration
Swift
@objc optional func navigationViewController(_ navigationViewController: NavigationViewController, routeStyleLayerWithIdentifier identifier: String, source: MGLSource) -> MGLStyleLayer?
-
Returns an
MGLStyleLayer
that determines the appearance of the route line’s casing.If this method is unimplemented, the navigation view controller’s map view draws the route line’s casing using an
MGLLineStyleLayer
whose width is greater than that of the style layer returned bynavigationViewController(_:routeStyleLayerWithIdentifier:source:)
.Declaration
Swift
@objc optional func navigationViewController(_ navigationViewController: NavigationViewController, routeCasingStyleLayerWithIdentifier identifier: String, source: MGLSource) -> MGLStyleLayer?
-
Returns an
MGLShape
that represents the path of the route line.If this method is unimplemented, the navigation view controller’s map view represents the route line using an
MGLPolylineFeature
based onroute
’scoordinates
property.Declaration
Swift
@objc(navigationViewController:shapeForRoutes:) optional func navigationViewController(_ navigationViewController: NavigationViewController, shapeFor routes: [Route]) -> MGLShape?
-
Returns an
MGLShape
that represents the path of the route line’s casing.If this method is unimplemented, the navigation view controller’s map view represents the route line’s casing using an
MGLPolylineFeature
identical to the one returned bynavigationViewController(_:shapeFor:)
.Declaration
Swift
@objc(navigationViewController:simplifiedShapeForRoute:) optional func navigationViewController(_ navigationViewController: NavigationViewController, simplifiedShapeFor route: Route) -> MGLShape?
-
Returns an
MGLShape
that represents the destination waypoints along the route (that is, excluding the origin).If this method is unimplemented, the navigation map view represents the route waypoints using
navigationViewController(_:shapeFor:legIndex:)
.Declaration
Swift
@objc(navigationViewController:shapeForWaypoints:legIndex:) optional func navigationViewController(_ navigationViewController: NavigationViewController, shapeFor waypoints: [Waypoint], legIndex: Int) -> MGLShape?
-
Called when the user taps to select a route on the navigation view controller’s map view.
Declaration
Swift
@objc(navigationViewController:didSelectRoute:) optional func navigationViewController(_ navigationViewController: NavigationViewController, didSelect route: Route)
Parameters
navigationViewController
The navigation view controller presenting the route that the user selected.
route
The route on the map that the user selected.
-
Returns the center point of the user course view in screen coordinates relative to the map view.
Declaration
Swift
@objc optional func navigationViewController(_ navigationViewController: NavigationViewController, mapViewUserAnchorPoint mapView: NavigationMapView) -> CGPoint
-
Allows the delegate to decide whether to ignore a location update.
This method is called on every location update. By default, the navigation view controller ignores certain location updates that appear to be unreliable, as determined by the
CLLocation.isQualified
property.Declaration
Swift
@objc(navigationViewController:shouldDiscardLocation:) optional func navigationViewController(_ navigationViewController: NavigationViewController, shouldDiscard location: CLLocation) -> Bool
Parameters
navigationViewController
The navigation view controller that discarded the location.
location
The location that will be discarded.
Return Value
If
true
, the location is discarded and theNavigationViewController
will not consider it. Iffalse
, the location will not be thrown out. -
Called to allow the delegate to customize the contents of the road name label that is displayed towards the bottom of the map view.
This method is called on each location update. By default, the label displays the name of the road the user is currently traveling on.
Declaration
Swift
@objc(navigationViewController:roadNameAtLocation:) optional func navigationViewController(_ navigationViewController: NavigationViewController, roadNameAt location: CLLocation) -> String?
Parameters
navigationViewController
The navigation view controller that will display the road name.
location
The user’s current location.
Return Value
The road name to display in the label, or nil to hide the label.