在 Swift 中在地图上显示路线

我试图在苹果地图上绘制两点之间的路线（Swift 代码）。 下面的结构体用于存储坐标

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，我收到地图上点的坐标。

var coordinates = self.foundLocations.map{$0.coordinate}

然后我在地图上画出路线

self.polyline = MKPolyline(coordinates: &coordinates, count: coordinates.count)
        self.mapView.addOverlay(self.polyline, level: MKOverlayLevel.AboveRoads)

为了绘制路线，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
}

我得到的只是两点之间的一条直线，而不是道路上的实际路线。 如何显示实际路线？

你实际上必须使用以下命令从苹果地图服务器获取路线calculateDirectionsWithCompletionHandler.

首先创建相关的MKMapItems 表示源和目标，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)
            }
        }
        })

（对于目的地重复此操作。）

然后获取MKRoute, ex:

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
    }
})

然后检索后MKRoute，您可以将折线添加到地图中，如下所示：

mapView.addOverlay(route.polyline, level: MKOverlayLevel.AboveRoads)