在 GMSMapView (Google Maps iOS SDK) 上绘制路线

Question

我想在我的mapView (GMSMapView) 上画一条从 A 点到 B 点的路线。

我试过这样做：

GMSMutablePath *path=[GMSMutablePath path];
    [path addCoordinate:self.locationManager.location.coordinate];
    [path addCoordinate:marker.position];

    GMSPolyline *rectangle=[GMSPolyline polylineWithPath:path];
    rectangle.strokeWidth=2.f;
    rectangle.map=self.mapView;

但它只是画了一条连接点 A 和点 B 的线，而不是路线本身（通过街道、道路等的方向......）。

我想在地图上画出步行从 A 点到 B 点的最佳方式。

我该怎么做？

谢谢！

Answer 1

使用谷歌地图方向 API。使用 NSURLConnection 或任何其他 3rd 方库（如 AFNetworking 等）将起始起点和目标位置点发送给它。获取 XML 或 JSON 中的响应并解析它。

Answer 2

{ dispatch_async(dispatch_get_main_queue(), ^{

        PlayBackObject *displayobj=[[PlayBackObject alloc]init];

        displayobj=[playBackMutArray objectAtIndex:0];

        double distanceLatitude = [displayobj.latitudeStr doubleValue];
        double distanceLongtitude =[displayobj.longitudeStr doubleValue];

        CLLocationDegrees lat = distanceLatitude;
        CLLocationDegrees lon =distanceLongtitude;

        GMSCameraPosition* camera = [GMSCameraPosition
                                     cameraWithLatitude:lat
                                     longitude:lon
                                     zoom: 9];


        GMSMapView *ListAlertMultimap;



            ListAlertMultimap =[GMSMapView mapWithFrame: CGRectMake(0, 0, 414,736) camera: camera];
            [GmapPlayView addSubview:ListAlertMultimap];



          path = [GMSMutablePath path];

        for (int i = 0; i < [playBackMutArray count]-1; i++)

        {

            double lat = [[[playBackMutArray objectAtIndex:i]valueForKey:@"latitudeStr" ] doubleValue];
            double lng = [[[playBackMutArray objectAtIndex:i]valueForKey:@"longitudeStr" ] doubleValue];

            marker = [[GMSMarker alloc] init];

            marker.position = CLLocationCoordinate2DMake(lat,lng);

            marker.appearAnimation = kGMSMarkerAnimationPop;
            NSString *title=[[playBackMutArray objectAtIndex:i]valueForKey:@"trackeridStr"];
            NSString *speed=[[playBackMutArray objectAtIndex:i]valueForKey:@"speedStr"];
            NSString *direction=[[playBackMutArray objectAtIndex:i]valueForKey:@"directionStr"];

            marker.title=[NSString stringWithFormat:@"Tracker ID : %@",title];
            marker.snippet=[NSString stringWithFormat:@"Speed : %@km/hr Direction : %@",speed,direction];

 //         marker.icon = [UIImage imageNamed:@"marker_start"];

            [ListAlertMultimap setMinZoom:2 maxZoom:25];
            marker.map = ListAlertMultimap;

            [path addLatitude:lat longitude:lng];
        }
           NSLog(@"Direction path");
           polyline = [GMSPolyline polylineWithPath:path];
           polyline.strokeColor = [UIColor blueColor];
           polyline.strokeWidth = 5.f;
           polyline.map=ListAlertMultimap;

    });

}