我试图在Apple地图上的两点之间绘制路线（Swift代码）。 以下结构用于存储坐标
struct GeoLocation {
var latitude: Double
var longitude: Double
func distanceBetween(other: GeoLocation) -> Double {
let locationA = CLLocation(latitude: self.latitude, longitude: self.longitude)
let locationB = CLLocation(latitude: other.latitude, longitude: other.longitude)
return locationA.distanceFromLocation(locationB)
}
}
self.foundLocations - is an array of these structures
在自定义类中，我收到地图上各点的坐标。
var coordinates = self.foundLocations.map{$0.coordinate}
然后我在地图上绘制路线
self.polyline = MKPolyline(coordinates: &coordinates, count: coordinates.count)
self.mapView.addOverlay(self.polyline, level: MKOverlayLevel.AboveRoads)
要绘制路线，我使用MKMapViewDelegate中的以下方法
func mapView(mapView: MKMapView!, rendererForOverlay overlay: MKOverlay!) -> MKOverlayRenderer! {
if let polylineOverlay = overlay as? MKPolyline {
let render = MKPolylineRenderer(polyline: polylineOverlay)
render.strokeColor = UIColor.blueColor()
return render
}
return nil
}
而不是实际铺设在道路上的路线，我只得到两点之间的直线。 如何显示实际路线？
答案 0 :(得分：6)
您实际上必须使用calculateDirectionsWithCompletionHandler从Apple的地图服务器获取路线。
首先为源和目标创建相关的MKMapItem，例如：
let geocoder = CLGeocoder()
let location = CLLocation(latitude: sourceLatitude, longitude: sourceLongitude)
geocoder.reverseGeocodeLocation(location, completionHandler: {
(placemarks:[AnyObject]?, error:NSError?) -> Void in
if placemarks?.count > 0 {
if let placemark: MKPlacemark = placemarks![0] as? MKPlacemark {
self.source = MKMapItem(placemark: placemark)
}
}
})
（重复目的地。）
然后获取MKRoute，例如：
let request:MKDirectionsRequest = MKDirectionsRequest()
// source and destination are the relevant MKMapItems
request.setSource(source)
request.setDestination(destination)
// Specify the transportation type
request.transportType = MKDirectionsTransportType.Automobile;
// If you're open to getting more than one route,
// requestsAlternateRoutes = true; else requestsAlternateRoutes = false;
request.requestsAlternateRoutes = true
let directions = MKDirections(request: request)
directions.calculateDirectionsWithCompletionHandler ({
(response: MKDirectionsResponse?, error: NSError?) in
if error == nil {
self.directionsResponse = response
// Get whichever currentRoute you'd like, ex. 0
self.route = directionsResponse.routes[currentRoute] as MKRoute
}
})
然后在检索MKRoute后，您可以将折线添加到地图中，如下所示：
mapView.addOverlay(route.polyline, level: MKOverlayLevel.AboveRoads)
答案 1 :(得分：0)
Swift 3 以及Lyndsey Scott回答的可重复转换：
final class Route {
static func getRouteFor(
source: CLLocationCoordinate2D,
destination: CLLocationCoordinate2D,
completion: @escaping (
_ route: MKRoute?,
_ error: String?)->()
) {
let sourceLocation = CLLocation(
latitude: source.latitude,
longitude: source.longitude
)
let destinationLocation = CLLocation(
latitude: destination.latitude,
longitude: destination.longitude
)
let request = MKDirectionsRequest()
self.getMapItemFor(location: sourceLocation) { sourceItem, error in
if let e = error {
completion(nil, e)
}
if let s = sourceItem {
self.getMapItemFor(location: destinationLocation) { destinationItem, error in
if let e = error {
completion(nil, e)
}
if let d = destinationItem {
request.source = s
request.destination = d
request.transportType = .walking
let directions = MKDirections(request: request)
directions.calculate(completionHandler: { response, error in
if let r = response {
let route = r.routes[0]
completion(route, nil)
}
})
}
}
}
}
}
static func getMapItemFor(
location: CLLocation,
completion: @escaping (
_ placemark: MKMapItem?,
_ error: String?)->()
) {
let geocoder = CLGeocoder()
geocoder.reverseGeocodeLocation(location) { placemark, error in
if let e = error {
completion(nil, e.localizedDescription)
}
if let p = placemark {
if p.count < 1 {
completion(nil, "placemark count = 0")
} else {
if let mark = p[0] as? MKPlacemark {
completion(MKMapItem(placemark: mark), nil)
}
}
}
}
}
}
用法：
Route.getRouteFor(source: CLLocationCoordinate2D, destination: CLLocationCoordinate2D) { (MKRoute?, String?) in
<#code#>
}