Sending push notification while in background objective c - objective-c

Question

First of all i am using parse.com to store information.
This code simply opens the Maps app every time this method is run and saves the users location in a server.
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];
}
What i noticed is that if Maps application is already open when this method is run then it does not save the users data until i return to the applikation. HOWEVER if i close the Maps application before this method is run the it is always sent to the server.
Now the problem i think is that it obviously takes more time for Maps app to open if it was not opened before hence giving my applikation more time to complete the update. How can i solve this so it will still update the location even if my applikation goes to the background?