ios – 沿MapKit路线的注释

我正在使用MapKit显示位置之间的路线,我正在寻找一种方法来添加与Apple Maps应用程序中的路线注释类似的注释,其中注释显示每个路线的旅行时间(如图所示)下面).我已经正确绘制方向,手头的问题是如何计算沿路线的一对坐标.也就是说,在哪里删除注释.

我以为以某种方式使用MKDirection(它包含完整的方向,一步一步),但我不知道如何生成一对位于路线中间的坐标.

我在MapKit文档中找不到任何类型的支持.有任何想法吗？

这是我如何生成路由并显示它.

- (void)generateRoute {
    MKDirectionsRequest *request = [[MKDirectionsRequest alloc] init];
    request.source = [MKMapItem mapItemForCurrentLocation];
    request.destination = self.destinationMapItem;
    MKDirections *directions = [[MKDirections alloc] initWithRequest:request];

    [directions calculateDirectionsWithCompletionHandler:
     ^(MKDirectionsResponse *response,NSError *error) {
         if (error) {
             // Handle Error
         } else {
             [self showRoute:response];
         }
     }];
}

- (void)showRoute:(MKDirectionsResponse *)response {
    [self.mapView removeOverlays:self.mapView.overlays];
    for (MKRoute *route in response.routes)
    {
        [self.mapView addOverlay:route.polyline level:MKOverlayLevelAboveRoads];
    }
    [self fitRegionToRoute];
}

- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id < MKOverlay >)overlay
{
    MKPolylineRenderer *renderer = [[MKPolylineRenderer alloc] initWithOverlay:overlay];
    renderer.strokeColor = [UIColor blueColor];
    renderer.alpha = 0.7;
    renderer.lineWidth = 4.0;

    return renderer;
}

解决方法

问题编辑：

最后在这个答案的帮助下,它的工作.我把它添加到下面的代码中,在这里说这里有魔术：

MKMapPoint middlePoint = route.polyline.points[route.polyline.pointCount/2];
[self createAndAddAnnotationForCoordinate:MKCoordinateForMapPoint(middlePoint)];

原来的答案：

我不知道这是否会有效.只是我的想法在你的问题.

我想你会创建路线如下
(检查我的内线评论)

MKDirectionsRequest *request = 
       [[MKDirectionsRequest alloc] init];
request.source = [MKMapItem mapItemForCurrentLocation];
request.destination = _destination;
request.requestsAlternateRoutes = NO;
MKDirections *directions = 
       [[MKDirections alloc] initWithRequest:request];

    [directions calculateDirectionsWithCompletionHandler:
 ^(MKDirectionsResponse *response,NSError *error) {
     if (error) {
         // Handle error
     } else {
         for (MKRoute *route in response.routes)
         {
             [_routeMap addOverlay:route.polyline level:MKOverlayLevelAboveRoads];
             //Here do the magic
             //MKPolyline confronts to MKOverlay so you can get the coordinate like 
             //route.polyline.coordinate once you get the coordinate then you can build
             //a annotation. A annotation is nothing but a coordinate with some title.
             //According to MKOverlay coordinate property it justs gives you the 
             //center point of the overlay area
             [self createAndAddAnnotationForCoordinate:route.polyline.coordinate]
         }
     }
 }];

添加注释

-(void) createAndAddAnnotationForCoordinate : (CLLocationCoordinate2D) coordinate{
    MyAnnotation* annotation= [[MyAnnotation alloc] init];
    annotation.coordinate = coordinate;

    annotation.title = @"Any Title";
    annotation.subtitle = @"Any Subtitle";

   [yourMap addAnnotation: annotation];

}