我的问题很简单，我计算了一条主要路线并将其添加到 Sygic MapView。我定义了起点和终点。它完美地工作。但是当我开始导航时尝试更改为替代路线时，它无法完美地重新计算新路线。我用过
func navigation(_ navigation: SYNavigation, didUpdate positionInfo: SYPositionInfo?) {
检测我的位置变化并每次计算路线，但我认为这不是最佳选择：
func navigation(_ navigation: SYNavigation, didUpdate positionInfo: SYPositionInfo?) {
if (mapRoute != nil){
mapView.remove(mapRoute)
computeRoute(from: startPointMP, to: endPointMP)
}
}
func computeRoute(from fromCoordinate: SYGeoCoordinate, to toCoordinate:
SYGeoCoordinate) {
let startWaypoint = SYWaypoint(position: fromCoordinate, type: .start, name: "Begin")
let endWaypoint = SYWaypoint(position: toCoordinate, type: .end, name: "End")
let routingOptions = SYRoutingOptions()
routingOptions.transportMode = .unknown// For other options see SYTransportMode
routingOptions.routingType = .economic// For other options see SYRoutingType
routing.computeRoute(startWaypoint, to: endWaypoint, via: nil, with: routingOptions)
}
func routing(_ routing: SYRouting, didComputePrimaryRoute route: SYRoute?) {
SYNavigation.shared().start(with: route)
// You might want to put it also on the map
mapRoute = SYMapRoute(route: route!, type: .primary)
markerEnd = SYMapMarker(coordinate: endPointMP!, image: UIImage(named: "Arrive")!)
mapView.add(mapRoute)
mapView.add(markerEnd)
mapView.add(markerStart)
mapView.cameraMovementMode = .free
}