问题描述
我正在尝试通过iOS使用Google Map SDK创建一个可绘制用户当前位置和所选位置之间路线的应用程序。 但是，似乎当我尝试获取所选位置的CLLocationCoordinate2D时，得到的坐标为（-180，-180），因此无法绘制路线。 我不太确定如何获取所选目的地的坐标，因为我刚开始使用Swift。
我在ViewController中的以下代码如下：
import UIKit
import GoogleMaps
import GooglePlaces
import MapKit
class MapViewController: UIViewController {
// [START maps_ios_current_place_declare_params]
var locationManager: CLLocationManager!
var currentLocation: CLLocation?
var mapView: GMSMapView!
var placesClient: GMSPlacesClient!
var zoomLevel: Float = 15.0
var originalLoc: CLLocationCoordinate2D?
var destinationLoc : CLLocationCoordinate2D?
// [END maps_ios_current_place_declare_params]
// [START maps_ios_current_place_places_params]
// An array to hold the list of likely places.
var likelyPlaces: [GMSPlace] = []
// The currently selected place.
var selectedplace: GMSPlace?
// [END maps_ios_current_place_places_params]
// A default location to use when location permission is not granted.
let defaultLocation = CLLocation(latitude: -33.869405,longitude: 151.199)
// [START maps_ios_current_place_unwindtomain]
// Update the map once the user has made their selection.
@IBAction func unwindToMain(segue: UIStoryboardSegue) {
// Clear the map.
mapView.clear()
// Add a marker to the map.
if selectedplace != nil {
let marker = GMSMarker(position: (self.selectedplace?.coordinate)!)
marker.title = selectedplace?.name
marker.snippet = selectedplace?.formattedAddress
marker.map = mapView
let destinationLoc = selectedplace!.coordinate
let originalLoc: CLLocationCoordinate2D = locationManager.location!.coordinate
drawRoute(from: originalLoc,to: destinationLoc)
}
listLikelyPlaces()
}
// [END maps_ios_current_place_unwindtomain]
override func viewDidLoad() {
super.viewDidLoad()
// [START maps_ios_current_place_init_params]
// Initialize the location manager.
locationManager = CLLocationManager()
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestAlwaysAuthorization()
locationManager.distanceFilter = 50
locationManager.startUpdatingLocation()
locationManager.delegate = self
placesClient = GMSPlacesClient.shared()
// [END maps_ios_current_place_init_params]
// [START maps_ios_current_place_create_a_map]
// Create a map.
let camera = GMSCameraPosition.camera(withLatitude: defaultLocation.coordinate.latitude,longitude: defaultLocation.coordinate.longitude,zoom: zoomLevel)
mapView = GMSMapView.map(withFrame: view.bounds,camera: camera)
mapView.settings.myLocationButton = true
mapView.autoresizingMask = [.flexibleWidth,.flexibleHeight]
mapView.isMyLocationEnabled = true
// Add the map to the view,hide it until we've got a location update.
view.addSubview(mapView)
mapView.isHidden = true
// [END maps_ios_current_place_create_a_map]
listLikelyPlaces()
}
// [START maps_ios_current_place_list_likely_places]
// Populate the array with the list of likely places.
func listLikelyPlaces() {
// Clean up from prevIoUs sessions.
likelyPlaces.removeAll()
placesClient.findplaceLikelihoodsFromCurrentLocation(withPlaceFields: .name) { (placeLikelihoods,error) in
guard error == nil else {
// Todo: Handle the error.
print("Current Place error: \(error!.localizedDescription)")
return
}
guard let placeLikelihoods = placeLikelihoods else {
print("No places found.")
return
}
// Get likely places and add to the list.
for likelihood in placeLikelihoods {
let place = likelihood.place
self.likelyPlaces.append(place)
}
}
}
// [END maps_ios_current_place_list_likely_places]
func drawRoute(from originPosition: CLLocationCoordinate2D,to destinationPosition: CLLocationCoordinate2D) {
let request = MKDirections.Request()
request.destination = MKMapItem(placemark: MKPlacemark(coordinate: destinationPosition))
request.source = MKMapItem(placemark: MKPlacemark(coordinate: originPosition))
request.requestsAlternateRoutes = false
let direction = MKDirections(request: request)
direction.calculate() {
(response,error) in
if let r = response,r.routes.count > 0 {
for route in r.routes {
let n = route.polyline.pointCount
let coordinates = UnsafeMutablePointer<CLLocationCoordinate2D>.allocate(capacity: n)
route.polyline.getCoordinates(coordinates,range: NSMakeRange(0,n))
let path = GMSMutablePath()
for index in 0..<n {
path.add(coordinates[index])
}
let polyline = GMSpolyline.init(path: path)
polyline.strokeWidth = 3
let bounds = GMSCoordinateBounds(path: path)
self.mapView!.animate(with: GMSCameraUpdate.fit(bounds,withPadding: 30.0))
polyline.map = self.mapView
}
}
}
}
// [START maps_ios_current_place_segue]
// Prepare the segue.
override func prepare(for segue: UIStoryboardSegue,sender: Any?) {
if segue.identifier == "seguetoSelect" {
if let nextViewController = segue.destination as? PlacesViewController {
nextViewController.likelyPlaces = likelyPlaces
}
}
}
// [END maps_ios_current_place_segue]
}
// [START maps_ios_current_place_location_manager_delegate]
// Delegates to handle events for the location manager.
extension MapViewController: CLLocationManagerDelegate {
// Handle incoming location events.
func locationManager(_ manager: CLLocationManager,didUpdateLocations locations: [CLLocation]) {
let location: CLLocation = locations.last!
print("Location: \(location)")
let camera = GMSCameraPosition.camera(withLatitude:location.coordinate.latitude,longitude: location.coordinate.longitude,zoom: zoomLevel)
if mapView.isHidden {
mapView.isHidden = false
mapView.camera = camera
} else {
mapView.animate(to: camera)
}
listLikelyPlaces()
}
// Handle authorization for the location manager.
func locationManager(_ manager: CLLocationManager,didChangeAuthorization status: CLAuthorizationStatus) {
switch status {
case .restricted:
print("Location access was restricted.")
case .denied:
print("User denied access to location.")
// display the map using the default location.
mapView.isHidden = false
case .notDetermined:
print("Location status not determined.")
case .authorizedAlways: fallthrough
case .authorizedWhenInUse:
print("Location status is OK.")
@unkNown default:
fatalError()
}
}
// Handle location manager errors.
func locationManager(_ manager: CLLocationManager,didFailWithError error: Error) {
locationManager.stopUpdatingLocation()
print("Error: \(error)")
}
}
// [END maps_ios_current_place_location_manager_delegate]
解决方法
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