ios7 - MKDirectionsResponse 总是返回 nil

Question

如果重复这个问题，我深表歉意，但我很难尝试使用 MKDirectionsRequest 显示两地之间的路线。

MKDirectionsRequest *request = [[MKDirectionsRequest alloc] init];
    request.source = [MKMapItem mapItemForCurrentLocation];
    request.transportType = MKDirectionsTransportTypeAny;
    request.destination = _dstItem;
    request.requestsAlternateRoutes = YES;


    MKDirections *directions = [[MKDirections alloc] initWithRequest:request];
   // __block typeof(self) weakSelf = self;
    [directions calculateDirectionsWithCompletionHandler:
     ^(MKDirectionsResponse *response, NSError *error) {

         //stop loading animation here

         if (error) {
             NSLog(@"Error is %@",error);
         } else {
             //do something about the response, like draw it on map
             MKRoute *route = [response.routes firstObject];
             [self.mapView addOverlay:route.polyline level:MKOverlayLevelAboveRoads];
         }
     }];

MKDirectionsResponse 总是返回 nil 和错误描述

Error Domain=MKErrorDomain Code=5 "Directions Not Available" 
UserInfo=0x1700f1c80 {NSLocalizedFailureReason=A route to the nearest road cannot be determined., 
MKErrorGEOError=-403, MKDirectionsErrorCode=6, NSLocalizedDescription=Directions Not Available}

Answer 1

MKDirectionsRequest 是查找两点之间路线的正确 API。 Apple 似乎还没有为印度添加路由功能。