ios - 获取多个坐标之间的方向

Question

我想在许多坐标(lat，long)之间获得一个独特的方向。例如，我有一个 API 获取请求返回 200 坐标，我必须在 map 中的这 200 个点之间创建一个唯一的方向。我该怎么做(200 点的数组按数学距离排序)。示例:

[9.6247279999999993, 46.170966100000001]
[9.6244014, 46.171050399999999]
[9.6240834999999993, 46.171273900000003]
[9.6240570000000005, 46.171284999999997]

Answer 1

属性:-

var mapView: MKMapView!
var polyLine: MKPolyline!
var lineView: MKPolylineView!

从纬度和经度创建坐标数组:

  var coordinateArray = [CLLocationCoordinate2D]()
for obj in arrayOfLatlong {
let coordinate = CLLocationCoordinate2DMake(lat1, lon1); 
coordinateArray.append(coordinate)
 }

//添加折线:-

 polyLine = MKPolyline(coordinates: coordinateArray, count: coordinateArray.count)
 mapView?.visibleMapRect = polyLine.boundingMapRect
//If you want the route to be visible
 mapView?.add(polyLine)

在委托(delegate)方法中:-

 func mapView(_ mapView: MKMapView, viewFor overlay: MKOverlay) -> 
  MKOverlayView {
if overlay == polyLine {
    if lineView == nil {
        lineView = MKPolylineView(polyline: routeLine)
        lineView.fillColor = UIColor.red
        lineView.strokeColor = UIColor.red
        lineView.lineWidth = 5
    }
    return lineView
}
return nil

创建可步行路径:-

   // Source
     let coordinate = CLLocationCoordinate2D(latitude: lat, longitude: 
  long)
     let placemark: MKPlacemark = MKPlacemark(coordinate: coordinate)
      let source =  MKMapItem(placemark: placemark)

   //Destination
    let destination =  MKMapItem(placemark: placemark)

    let request:MKDirectionsRequest = MKDirectionsRequest()
    request.source = source
    request.destination = destination
    // Specify the transportation type
    request.transportType = MKDirectionsTransportType.walking;

    request.requestsAlternateRoutes = true

    let directions = MKDirections(request: request)

    directions.calculate (completionHandler: {
        (response: MKDirectionsResponse?, error: NSError?) in
        if error == nil {
            let directionsResponse = response
            // Get whichever currentRoute you'd like, ex. 0
       self.arrayOfRoutes =  directionsResponse?.routes
        }
    } as! MKDirectionsHandler)

从 arrayOfRoutes 获取路线并显示在 mapview 上。

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