Question

我在当前用户位置和地图上的某个点之间创建了一条路线。我可以从MKRoute获得有关方向的说明。问题是：如何检测下一个十字路口何时需要左转或右转？看起来应该是这样的：“在下一个十字路口左转”。我很乐意在Swift或Objective C中看到解决方案。

Answer 1

您可以使用以下代码执行此操作

MKDirections *directions = [[MKDirections alloc] initWithRequest:request];
[directions calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse *response, NSError *error) {
    if (!error) {
        for (MKRoute *route in [response routes]) {
            [myMapView addOverlay:[route polyline] level:MKOverlayLevelAboveRoads]; // Draws the route above roads, but below labels.
            // You can also get turn-by-turn steps, distance, advisory notices, ETA, etc by accessing various route properties.
        }
    }
}];

浏览不同的MKRoute属性以获得您想要的内容。

Answer 2

项目，您将看到自定义注释，在mapView上显示源和目标坐标。

时间到两个注释之间的方向。

请点击此链接： - https://developer.apple.com/documentation/mapkit/mkroute

MKRoute 对象定义路径的几何图形，即包含与特定地图坐标关联的线段。路线对象还可以包括其他信息，例如路线的名称，距离和预期的行驶时间。例如，一个步骤可能涉及一条道路，直到需要转弯为止。

在viewController.m类中添加以下代码。

-(void)viewDidAppear:(BOOL)animated
{
   MKPlacemark *source = [[MKPlacemark alloc]initWithCoordinate:sourceCoordinate.coordinate addressDictionary:[NSDictionary dictionaryWithObjectsAndKeys:@"",@"", nil] ];
   MKMapItem *sourceMapItem = [[MKMapItem alloc]initWithPlacemark:source];
   MKPlacemark *destination = [[MKPlacemark alloc]initWithCoordinate:destinationCoordinate.coordinate addressDictionary:[NSDictionary dictionaryWithObjectsAndKeys:@"",@"", nil] ];
   MKMapItem *distMapItem = [[MKMapItem alloc]initWithPlacemark:destination];
   MKDirectionsRequest *request = [[MKDirectionsRequest alloc]init];
   [request setSource:sourceMapItem];
   [request setDestination:distMapItem];
   [request setTransportType:MKDirectionsTransportTypeAutomobile];
   MKDirections *direction = [[MKDirections alloc]initWithRequest:request];
   [direction calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse *response, NSError *error) {
   if (!error) {
       for (MKRoute *route in [response routes]) {
            [_mMapView addOverlay:[route polyline] level:MKOverlayLevelAboveRoads];
       }
   }
 }];
}
- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id)overlay
{
    if ([overlay isKindOfClass:[MKPolyline class]]) {
        MKPolylineRenderer *renderer = [[MKPolylineRenderer alloc] initWithOverlay:overlay];
        [renderer setStrokeColor:[UIColor redColor]];
        [renderer setLineWidth:3.0];
         return renderer;
     }
   return nil;
}

对于Swift

更新

override func viewDidLoad() {
    super.viewDidLoad()

    let request = MKDirectionsRequest()
    request.source = MKMapItem(placemark: MKPlacemark(coordinate: CLLocationCoordinate2D(latitude:"", longitude: ""), addressDictionary: nil))
    request.destination = MKMapItem(placemark: MKPlacemark(coordinate: CLLocationCoordinate2D(latitude: "", longitude: ""), addressDictionary: nil))
    request.requestsAlternateRoutes = true
    request.transportType = .automobile

    let directions = MKDirections(request: request)

    directions.calculate { [unowned self] response, error in
        guard let unwrappedResponse = response else { return }

        for route in unwrappedResponse.routes {
            self.mapView.add(route.polyline)
            self.mapView.setVisibleMapRect(route.polyline.boundingMapRect, animated: true)
        }
    }
}

func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
    let renderer = MKPolylineRenderer(polyline: overlay as! MKPolyline)
    renderer.strokeColor = UIColor.blue
    return renderer
}

MKMapViw方向说明

2 个答案: