Quero verificar toda vez que o usuário passa por uma loja de uma variedade de lojas, tenho mais de 20 lojas, então escrevi uma função que localiza as 20 lojas mais próximas da localização do usuário e as monitora. A lista sendo atualizada emlocationManager: didUpdateLocations, Também substituo as antigas 20 regiões monitoradas pela nova localização das 20 lojas mais próximas.

O problema é quelocationManager: didEnterRegion não está sendo chamado regularmente quando o usuário entra em uma região.

Também notei que, quando verifico olocationManager.monitoredRegions NSSet as regiões estão erradas por algum motivo (eu verifiquei comif sentença, então talvez eles estejam corretos e sejam mais curtos?).

Se alguém puder verificar meu código e talvez perceber algo que fiz de errado, isso realmente me ajudará!

Meu código:

monitorLocationViewController.m(role para ver o código completo):

-(void)getStoresArrays:(NSNotification*)notification
{
    //Fetching "allStoresArray"(NSArray of all the stores sent from another class using NSNotificationCenter) and adding it to "allStores"(NSMutableArray)
    NSDictionary *storesCategoriesArrays=[notification userInfo];
    self.allStores=[storesCategoriesArrays objectForKey:@"allStoresArray"];

    //Calling "locationChangeHandler" for monitoring
    [self locationChangeHandler];
}

#pragma mark - CLLocationDelegate methods
//Being called when user's location updated
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations
{
    //If "allStores"(NSMutableArray) isn't nil - calling "locationChangeHandler" to update monitoring
    if (self.allStores!=nil) {
        [self locationChangeHandler];
    }
}
//Being called when user enters a monitored region
-(void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region
{
    NSLog(@"Entered");
}

#pragma mark - Closest stores sorting methods
//Sorting closest stores to the user's location and adding the 20 closest store to "twentyClosestStores"(NSMutableArray)
-(void)sortClosestStores
{
    //Sorting "allStores"(NSMutableArray) from the closest "Store" to the furthest.
    [self.allStores sortUsingComparator:^NSComparisonResult(id  _Nonnull obj1, id  _Nonnull obj2) {
        //Creating "location1"(CLLocation) and "location2"(CLLocation) and initializing each with "obj1"(id) and "obj2"(id) coordinates
        CLLocation *location1=[[CLLocation alloc] initWithLatitude:((Store*)obj1).geoPoint.latitude longitude:((Store*)obj1).geoPoint.longitude];
        CLLocation *location2=[[CLLocation alloc] initWithLatitude:((Store*)obj2).geoPoint.latitude longitude:((Store*)obj2).geoPoint.longitude];

        //Creating "dist1"(float) and setting its value to the distance between "location1"(CLLocation) and the user's location
        float dist1 =[location1 distanceFromLocation:self.locationManager.location];
        //Creating "dist2"(float) and setting its value to the distance between "location2"(CLLocation) and the user's location
        float dist2 = [location2 distanceFromLocation:self.locationManager.location];

        //If the distances are equal - the order will stay the same
        if (dist1 == dist2) {
            return NSOrderedSame;
        }
        else if (dist1 < dist2) { //If "dist1"(float) is smaller than "dist2"(float) - "dist2"(float) will be before "dist1" in the array
            return NSOrderedAscending;
        }
        else { //else - "dist2"(float) will be before "dist1" in the array
            return NSOrderedDescending;
        }
    }];

    //If "twentyClosestStores"(NSMutableArray) is nil
    if (self.twentyClosestStores==nil) {
        //Initializing "twentyClosestStores"(NSMutableArray)
        self.twentyClosestStores=[NSMutableArray array];
    }

    //If "previousTwentyStores"(NSMutableArray) is nil
    if (self.previousTwentyStores==nil) {
        //Initializing "previousTwentyStores"(NSMutableArray)
        self.previousTwentyStores=[NSMutableArray array];
    }
    //Setting "previousTwentyStores"(NSMutableArray) to "twentyClosestStores"(NSMutableArray)
    self.previousTwentyStores=self.twentyClosestStores;
    //Cleaning (reInitializing) "twentyClosestStores"(NSMutableArray)
    self.twentyClosestStores=[NSMutableArray array];

    //Adding indexes 0-19 of "allStores"(NSMutableArray) (20 closest stores to the user's current location) to "twentyClosestStores"(NSMutableArray)
    for (int i = 0; i < 20; i++) {
        [self.twentyClosestStores addObject:[self.allStores objectAtIndex:i]];
    }
}

#pragma mark - Start/stop monitoring methods
//For updating monitoring
-(void)locationChangeHandler
{
    //If "allStores"(NSMutableArray) isn't nil
    if (self.allStores!=nil) {
        //Finding the 20 closest stores to he user's location and adding it to "twentyClosestStores"(NSMutableArray)
        [self sortClosestStores];
        //Stop monitoring "previousTwentyStores"(NSMutableArray) (20 closest stores before user's location  updated)
        [self stopMonitoringStores];
        //Start monitoring "twentyClosestStores"(NSMutableArray)
        [self startMonitoringClosestStores];
    }
}
//Start monitoring "twentyClosestStores"(NSMutableArray)
-(void)startMonitoringClosestStores
{
    //If monitoring isn't availible for "CLCircularRegion"
    if (![CLLocationManager isMonitoringAvailableForClass:[CLCircularRegion class]]) {
        NSLog(@"Monitoring is not available for CLCircularRegion class");
    }

    //Run on all "twentyClosestStores"(NSMutableArray)'s objects
    for (Store *currentStore in self.twentyClosestStores) {
        //Creating "region"(CLCircularRegion) and setting it to "currentStore"(Store)'s circular region
        CLCircularRegion *region=[currentStore createCircularRegion];

        //Start monitoring "region"(CLCircularRegion)
        [self.locationManager startMonitoringForRegion:region];
    }
}
//Stop monitoring "previousTwentyStores"(NSMutableArray) (20 closest stores before user's location  updated)
-(void)stopMonitoringStores
{
    //Run on all "previousTwentyStores"(NSMutableArray)'s objects
    for (Store *currentStore in self.previousTwentyStores) {
        //Creating "region"(CLCircularRegion) and setting it to "currentStore"(Store)'s circular region
         CLCircularRegion *region=[currentStore createCircularRegion];

        //Stop monitoring "region"(CLCircularRegion)
        [self.locationManager stopMonitoringForRegion:region];
    }
}

//Finding a store for region
-(Store*)storeForRegion:(CLCircularRegion*)region
{
    //Creating "latitude"(CGFloat) and "longtitude"(CGFloat) and setting it to "region"(CLCircularRegion)'s center.latitude/longtitude
    CGFloat latitude=region.center.latitude;
    CGFloat longtitude=region.center.longitude;

    //Run on all "allStores"(NSMutableArray)'s objects
    for (Store *currentStore in self.allStores) {

        //If "currentStore"(Store)'s latitude and longtitude is equal to "latitude"(CGFloat) and longtitude(CGFloat)
        if (currentStore.geoPoint.latitude==latitude&&currentStore.geoPoint.longitude==longtitude) {
            //Returning "currentStore"(Store)
            return currentStore;
        }
    }
    //Store not found - returning nil
    NSLog(@"No store found for this region: %@",[region description]);
    return nil;
}

Store.m:

    //Creating and returning a "CLCircularRegion" object of the store
-(CLCircularRegion*)createCircularRegion
{
    //Creating "region"(CLCircularRegion) and initializing it with current store information (self) and radios of 200m
    CLCircularRegion *region=[[CLCircularRegion alloc] initWithCenter:self.geoPoint radius:200 identifier:self.identifier];

    //Setting "region"(CLCircularRegion)'s notifyOnEntry to YES
    region.notifyOnEntry=YES;

    //Returning "region"(CLCircularRegion)
    return region;
}

Nota: Os métodos delegados estão sendo chamados, mesmodidEnterRegion: mas nem sempre por algum motivo.

Resolveu o problema:

(Decidi não usar o monitoramento da região e fazer isso sozinho)

 -(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations
{
    [self checkIfNearStore]; //Not being called in background
}

-(void)checkIfNearStore
    {
        for (Store *currentStore in self.allStores) {
            if ([currentStore.circularRegion containsCoordinate:self.locationManager.location.coordinate]&&currentStore.alreadySendNotification==NO) {
                NSLog(@"Entered: %@",[[self storeForRegion:currentStore.circularRegion] address]);
                currentStore.alreadySendNotification=YES;
                [self.storesAlreadySentNotifications addObject:currentStore];
            }
        }

        for (Store *currentStore in self.storesAlreadySentNotifications) {
            if (![currentStore.circularRegion containsCoordinate:self.locationManager.location.coordinate]) {
                currentStore.alreadySendNotification=NO;
            }
        }
    }

Muito obrigado!