Question

首先，我使用parse.com存储信息。此代码仅在每次运行此方法时打开“地图”应用，并将用户位置保存在服务器中。

   MKDirectionsRequest *request = [[MKDirectionsRequest alloc] init];
            [request setSource:[MKMapItem mapItemForCurrentLocation]];
            [request setDestination:endingItem];
            [request setTransportType:MKDirectionsTransportTypeAutomobile];
            [request setRequestsAlternateRoutes:YES];
            MKDirections *directions = [[MKDirections alloc] initWithRequest:request];
            [directions calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse *response, NSError *error) {
                if ( ! error && [response routes] > 0) {
                    MKRoute *route = [[response routes] objectAtIndex:0];
                    //route.distance  = The distance
                    NSLog(@"total %f",route.expectedTravelTime );
                    int time = ceil(route.expectedTravelTime/60);
                    self.ETA = [@(time) stringValue];
                    NSLog(@"test %d",time);
                    NSLog(@"Total Distance (in Meters) :%0.1f",route.distance/1000);
                    self.distance = [@(route.distance*4899) stringValue];

                    // IF decline was pressed, need to fix if it's accepted
                    NSMutableDictionary *params = [[NSMutableDictionary alloc] init];
                    [params setObject:self.distance forKey:@"dist"];

                    [PFCloud callFunctionInBackground:@"sendAccepted" withParameters:params block:^(id object, NSError *error) {
                        if (!error) {
                            NSLog(@"Success answer sent");
                        } else {
                            NSLog(@"Failed to push");
                        }

                    }];


                }
            }];


            [endingItem openInMapsWithLaunchOptions:launchOptions];

        }

我注意到，如果在运行此方法时地图应用程序已经打开，那么在我返回应用程序之前它不会保存用户数据。但是，如果在运行此方法之前关闭Maps应用程序，则始终将其发送到服务器。

现在问题我认为，如果地图应用程序未打开之前显然需要更多时间才能打开，从而让我的应用程序有更多时间来完成更新。如何解决这个问题，即使我的应用程序进入后台，它仍会更新位置？

在后台目标c中发送推送通知

0 个答案: