在两个纬度和经度之间绘制折线

Posted 2023-03-10

【中文标题】在两个纬度和经度之间绘制折线

【英文标题】：draw polyline between two latitude and longitude

【发布时间】：2018-06-26 10:49:54

【问题描述】：

我为源和目的地传递了两个 lat 和 long，但没有在两点之间绘制折线。总是出错。下面的代码我在源坐标中传递我的当前位置，在 destCoordinates 中传递旅行位置。我想在 sourceCoordinates 到 destCoordinates 之间绘制折线..

  if(CLLocationManager.locationServicesEnabled())
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.startUpdatingLocation()
    

    //let sourceCoordinates = locationManager.location?.coordinate


      let sourceCoordinates = CLLocationCoordinate2DMake(19.115950,72.856448)
    let destCoordinates = CLLocationCoordinate2DMake(19.119670,72.853616)
    let sourcePlacemark = MKPlacemark(coordinate: sourceCoordinates)
         let destPlacemark = MKPlacemark(coordinate: destCoordinates)

    let sourceItem = MKMapItem(placemark: sourcePlacemark)
    let destItem = MKMapItem(placemark: destPlacemark)

    let directionRequest = MKDirectionsRequest()

    directionRequest.source=sourceItem
    directionRequest.destination=destItem



    directionRequest.transportType = .walking
    let directions = MKDirections(request: directionRequest)
    directions.calculate(completionHandler: 
    response,error in
        guard let response = response else

           if let error = error 
            print("something wrong")
            
            return
        
        let route = response.routes[0]
        self.upcoming_info_map.add(route.polyline,level: .aboveRoads)
        let rekt = route.polyline.boundingMapRect
        self.upcoming_info_map.setRegion(MKCoordinateRegionForMapRect(rekt), animated: true)

    )

绘制折线我使用这个函数

    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer 
    let renderer = MKPolygonRenderer(overlay:overlay)
    renderer.strokeColor = UIColor.blue
    renderer.lineWidth = 5.0
    return renderer

【问题讨论】：

你设置代理了吗

如果您打印出错误，它会清楚地显示“步行路线不可用”，因此请更改方向类型并检查

对于苹果地图中没有的印度方向，请尝试其他纬度和经度

【参考方案1】：

使用此方法获取位置列表并绘制折线

    func addPolyLineToMap(googlemaplist: [CLLocation?])


    var coordinates = googlemaplist.map( (location: CLLocation!) -> CLLocationCoordinate2D in
        return location.coordinate
    )

    print("locatios count")
    print(googlemaplist.count)

    var polyline = MKPolyline(coordinates: &coordinates, count: googlemaplist.count)

    DispatchQueue.main.async 
        self.MapKit.add(polyline)