iphone - 在iPhone的Google Map上绘制路线

我想在地图上使用纬度和经度绘制路线。怎么画？

这是我的代码。但它不起作用。我在点可变数组中添加了位置。然后调用drawRoute函数在该位置之间绘制路线。

- (void)viewDidLoad {
    [super viewDidLoad];
CLLocationCoordinate2D location;
    location.latitude = (double) 23.00000;
    location.longitude = (double) 73.00000;


CLLocationCoordinate2D location2;
    location2.latitude = (double) 73.00000;
    location2.longitude = (double) 23.00000;

    CLLocation *locationPoint1 = [[CLLocation alloc]initWithLatitude:location.latitude longitude:location.longitude];
    CLLocation *locationPoint2 = [[CLLocation alloc]initWithLatitude:location2.latitude longitude:location2.longitude];
    [self.points addObject:locationPoint1];
    [self.points addObject:locationPoint2];
[self performSelector:@selector(drowRoute)];
}


-(void)drowRoute{
    CGContextRef context = UIGraphicsGetCurrentContext();
 //   CGContextSetStrokeColorWithColor(context, [[UIColor blueColor]CGColor]);
    CGContextSetLineWidth(context, 2.0);

    for(int idx = 0; idx < self.points.count; idx++)
    {
        CLLocation* location = [self.points objectAtIndex:idx];
        CGPoint point = [mapView convertCoordinate:location.coordinate toPointToView:self.view];

        if(idx == 0)
        {
            // move to the first point
            CGContextMoveToPoint(context, point.x, point.y);
        }
        else
        {
            CGContextAddLineToPoint(context, point.x, point.y);
        }
    }
    CGContextStrokePath(context);
}

最佳答案

我通过Goggle Map Services使用它。您只需要将经度和纬度作为URL的参数传递，其余的就由Google地图负责。

- (void)viewDidLoad
{
  [super viewDidLoad];
  locationManager = [[CLLocationManager alloc] init];
  locationManager.delegate = self;
  locationManager.distanceFilter = kCLDistanceFilterNone;
  locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;
  [locationManager startUpdatingLocation];

    NSString *url = [NSString stringWithFormat: @"http://maps.google.com/maps?saddr=%f,%f&daddr=%f,%f",c_lat,c_long,lat,lat];
  //saddr= we pass source address long, lat.
  //daddr= we pass destination address long, lat.

  //--------use this if you have current long,lat and destination's address or street name etc...

   NSString* url = [NSString stringWithFormat: @"http://maps.google.com/maps?saddr=%f,%f&daddr=%@",
                currentLocation.latitude, currentLocation.longitude,
                [address stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
   //------------------------------------------------------------------------------
   [[UIApplication sharedApplication] openURL: [NSURL URLWithString:url]]; // this line will open Google map on Maps application on device and in Safari in Simulator.


}

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{

  curntloc = [[CLLocation alloc] initWithLatitude:newLocation.coordinate.latitude longitude:newLocation.coordinate.longitude];

 NSLog(@"in func--> %f %f",curntloc.coordinate.latitude, curntloc.coordinate.longitude);
}