如何在MKMapView上的路径中心显示expectedTravelTime

Question

我想在MKMapView的指定路线的中心显示一个白色矩形，其预期行程时间。

Answer 1

以下是我用来获取ETA＆amp; amp;路线的中心点，您可以使用ETACoordinate并创建自定义注释视图并将其添加到地图

- （void）showRouteBetweenSourceCoordinate：（CLLocationCoordinate2D）sourceCoordinate destinationCoordinate：（CLLocationCoordinate2D）destinationCoordinate onMapView：（MKMapView *）onMapView onCompletion：（void（^）（NSString * ETA，CLLocationCoordinate2D ETACoordinate，NSError * error））onCompletion {

MKDirectionsRequest *request =
[[MKDirectionsRequest alloc] init];

MKPlacemark *sourcePlacemark = [[MKPlacemark alloc] initWithCoordinate:sourceCoordinate addressDictionary:nil];
MKMapItem *sourceMapItem=[[MKMapItem alloc] initWithPlacemark:sourcePlacemark];
request.source = sourceMapItem;

MKPlacemark *destinationPlacemark = [[MKPlacemark alloc] initWithCoordinate:destinationCoordinate addressDictionary:nil];
MKMapItem *destinationMapItem=[[MKMapItem alloc] initWithPlacemark:destinationPlacemark];
request.destination = destinationMapItem;

request.requestsAlternateRoutes = NO;
[request setTransportType:MKDirectionsTransportTypeAutomobile];

MKDirections *directions =
[[MKDirections alloc] initWithRequest:request];

[directions calculateDirectionsWithCompletionHandler:
 ^(MKDirectionsResponse *response, NSError *error) {
     if (error) {
         onCompletion(nil,CLLocationCoordinate2DMake(0, 0),error);
     } else {

         if (response.routes.count>0) {


             MKRoute *route=response.routes[0];

             MKMapPoint routePoint=route.polyline.points[route.polyline.pointCount/2]; // get the center point of the polyline

             [onMapView addOverlay:route.polyline level:MKOverlayLevelAboveRoads];

             CLLocationCoordinate2D etaCoordinate=MKCoordinateForMapPoint(routePoint);

             int etaInMins=(int)(route.expectedTravelTime/60);

             onCompletion([NSString stringWithFormat:@"%d min",etaInMins],etaCoordinate,nil);

         }
         else
             onCompletion(nil,CLLocationCoordinate2DMake(0, 0),nil);

     }
 }];

}