如何跟踪用户的位置并显示使用谷歌地图移动的路径ios SDK

Question

我目前正在构建一个iOS应用程序，我希望实现一个功能，用户的位置显示在Google Map视图上，以及它们何时移动一个多段线节目是用户到目前为止所走过的路径。这显然需要实时发生。

到目前为止，我已经初始化了Google Maps视图，并且可以使用observeValueForKeyPath函数来显示用户的当前位置。随着用户移动，视图和位置标记更新。

我想要做到这一点的最佳方法是创建一个GMSMutablePath对象，每当地图摄像机更新到新位置时添加用户的当前位置，然后从该路径创建折线。我已经使用这个代码如下：

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context 
{ 
    if ([keyPath isEqualToString:@"myLocation"] && [object isKindOfClass:[GMSMapView class]]) 
    { 
     [self.myMapView animateToCameraPosition:[GMSCameraPosition cameraWithLatitude:self.myMapView.myLocation.coordinate.latitude 
                       longitude:self.myMapView.myLocation.coordinate.longitude 
                         zoom:18]]; 


     [trackedPath addCoordinate:CLLocationCoordinate2DMake(self.myMapView.myLocation.coordinate.latitude, self.myMapView.myLocation.coordinate.longitude)]; 
     GMSPolyline *testPoly = [GMSPolyline polylineWithPath:trackedPath]; 
     testPoly.strokeWidth = 8; 
     testPoly.strokeColor = [UIColor redColor]; 
     testPoly.map = myMapView; 
    } 
} 

这不会产生任何地图折线在实践中因此任何帮助/建议将不胜感激！

Answer 1

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{ NSString *pointString=[NSString stringWithFormat:@"%f,%f",newLocation.coordinate.latitude,newLocation.coordinate.longitude]; 
    [self.points addObject:pointString]; 
GMSMutablePath *path = [GMSMutablePath path]; 
for (int i=0; i<self.points.count; i++) 
{   
    NSArray *latlongArray = [[self.points objectAtIndex:i]componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@","]]; 

[path addLatitude:[[latlongArray objectAtIndex:0] doubleValue] longitude:[[latlongArray objectAtIndex:1] doubleValue]]; 
} 

if (self.points.count>2) 
{ 
    GMSPolyline *polyline = [GMSPolyline polylineWithPath:path]; 
    polyline.strokeColor = [UIColor blueColor]; 
    polyline.strokeWidth = 5.f; 
    polyline.map = mapView_; 
    self.view = mapView_; 
}} 

Answer 2

如果要绘制两条路径，则使用此方法。其演示swift方法来查找两个地方的路线。

//MARK: API CALL 
func GetRoughtofTwoLocation(){ 
    let originString: String = "\(23.5800),\(72.5853)" 
    let destinationString: String = "\(24.5836),\(72.5853)" 
    let directionsAPI: String = "https://maps.googleapis.com/maps/api/directions/json?" 
    let directionsUrlString: String = "\(directionsAPI)&origin=\(originString)&destination=\(destinationString)&mode=driving" 

    APICall().callApiUsingWithFixURLGET(directionsUrlString, withLoader: true) { (responceData) -> Void in 
     let json = responceData as! NSDictionary 
     let routesArray: [AnyObject] = (json["routes"] as! [AnyObject]) 
     var polyline: GMSPolyline? = nil 
     if routesArray.count > 0 { 
      let routeDict: [NSObject : AnyObject] = routesArray[0] as! [NSObject : AnyObject] 
      var routeOverviewPolyline: [NSObject : AnyObject] = (routeDict["overview_polyline"] as! [NSObject : AnyObject]) 
      let points: String = (routeOverviewPolyline["points"] as! String) 
      let path: GMSPath = GMSPath(fromEncodedPath: points)! 
      polyline = GMSPolyline(path: path) 
      polyline!.strokeWidth = 2.0 
      polyline!.map = self.mapView 
     } 

    } 
}