Comparing 2 cities from 2 locations in background - ios

Question

I have an app that the user saves a location and set the radius to be notified about it: 1KM, 5KM (the user will recive a notification if the location he saved earlier and he's current location in in the setted radius) and "City" (the user will recive a notification if the city of the location he saved earlier and the city where he currently is are the same city).
Note: I'm using Google Maps iOS SDK.
I have a method called -sendNotificationIfNeeded that checks if to send a notification, code:
-(void)sendNotificationIfNeeded
{
if (self.muteEnabled==YES) { //Check if the user muted the app
NSLog(#"Mute enabled");
return;
}
//Important part:
if([self checkIfUserInRadiusForLocation:[self.savedLocations objectAtIndex:0]])
{
UILocalNotification *notification=[self createNotification];
[self sendNotification:notification];
}
}
The method checkIfUserInRadiusForLocation check the radius of the savedLocation (CLCircularRegion) and checks if the user is inside this radius, code:
-(BOOL)checkIfUserInRadiusForLocation:(SavedLocation*)location
{
if(location.radiusString isEqualToString:#“1KM”)
{
if(location.circularRegion containsCoordinate:self.locationManager.location.coordinate)
{
return YES;
}
}else if(location.radiusString isEqualToString:#“5KM”)
{
if(location.circularRegion containsCoordinate:self.locationManager.location.coordinate)
{
return YES;
}
//Important part:
}else if(location.radiusString isEqualToString:#“City”)
{
if([self checkIfUserCityIsSameToLocation:location)
{
return YES;
}
}
return NO;
}
The method checkIfUserCityIsSameToLocation: finds the savedLocation city and the user's location city and checks if they're equals (the problem is here), code:
-(BOOL)checkIfUserCityIsSameToLocation:(savedLocation*)location
{
//Checking user's city
__block NSString *userCity;
[[GMSGeocoder geocoder]reverseGeocodeCoordinate:self.locationManager.location.coordinate completionHandler:^(GMSReverseGeocodeResponse *response, NSError *error) {
if (error) {
NSLog(#"%#",[error description]);
}
userCity=[[[response results] firstObject] locality];
}];
//Checking savedLocation’s city
__block NSString *savedLocationCity;
[[GMSGeocoder geocoder]reverseGeocodeCoordinate:location.circularRegion.center completionHandler:^(GMSReverseGeocodeResponse *response, NSError *error) {
if (error) {
NSLog(#"%#",[error description]);
}
savedLocationCity=[[[response results] firstObject] locality];
NSLog(#"");
}];
if ([userCity isEqualToString:savedLocationCity]) { //Both string cities are nil
Return YES;
}else
{
Return No
}
}
The problem is that when the app reaching the if statment on checkIfUserCityIsSameToLocation: both userCity and savedLocationCity are nil (becuase reverseGeocodeCoordinate: completionHandler: method is running on a background thread).
I can't figure out how to solve it,
I'll really appriciate if someone will help me with this.
Thank you very much!

Answer 1

Do it like this:
-(BOOL)checkIfUserInRadiusForLocation:(SavedLocation*)location userCity: (NSString *) userCity locationCity: (NSString *) locationCity
{
if(location.radiusString isEqualToString:#“1KM”)
{
if(location.circularRegion containsCoordinate:self.locationManager.location.coordinate)
{
return YES;
}
}else if(location.radiusString isEqualToString:#“5KM”)
{
if(location.circularRegion containsCoordinate:self.locationManager.location.coordinate)
{
return YES;
}
//Important part:
}else if(location.radiusString isEqualToString:#“City”)
{
if([userCity isEqual: locationCity])
{
return YES;
}
}
return NO;
}
-(void)sendNotificationIfNeeded
{
if (self.muteEnabled==YES) { //Check if the user muted the app
NSLog(#"Mute enabled");
return;
}
SavedLocation* location = [self.savedLocations objectAtIndex:0];
[[GMSGeocoder geocoder]reverseGeocodeCoordinate:self.locationManager.location.coordinate completionHandler:^(GMSReverseGeocodeResponse *response, NSError *error) {
if (error) {
NSLog(#"%#",[error description]);
}
NSString *userCity=[[[response results] firstObject] locality];
[[GMSGeocoder geocoder]reverseGeocodeCoordinate:location.circularRegion.center completionHandler:^(GMSReverseGeocodeResponse *response, NSError *error) {
if (error) {
NSLog(#"%#",[error description]);
}
NSString *savedLocationCity=[[[response results] firstObject] locality];
if([self checkIfUserInRadiusForLocation:location userCity: userCity locationCity: savedLocationCity])
{
UILocalNotification *notification=[self createNotification];
[self sendNotification:notification];
}
}];
}];
}