地理围栏不发送通知 (iOS)

Question

每次用户经过我客户的商店（大约 1700 家商店）时，我都会尝试发送通知，但它不起作用。

谁能告诉我为什么？

我的代码：

Store.m

-(CLCircularRegion*)createCircularRegion
{
    CLCircularRegion *region=[[CLCircularRegion alloc] initWithCenter:self.geoPoint radius:1000 identifier:self.identifier];

    region.notifyOnEntry=YES;

    return region;
}

viewController.m

-(void)startMonitoringAllStores
{
    if (![CLLocationManager isMonitoringAvailableForClass:[CLCircularRegion class]]) {
        NSLog(@"Monitoring is not available for CLCircularRegion class");
    }

    for (Store *currentStore in self.allStores) {
        CLCircularRegion *region=[currentStore createCircularRegion];
        [self.locationManager startMonitoringForRegion:region];
    }
}

-(void)getStoresFromParse
{
    [self findObjectsWithClassName:@"Stores"];

    [self.allStores addObjectsFromArray:self.allStores];

    [self startMonitoringAllStores];
}

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    self.locationManager.delegate=self;
    [self.locationManager requestAlwaysAuthorization];

    return YES;
}


-(void)handleRegionEvent:(CLRegion*)region
{
    NSLog(@"Geofence triggered");
}


-(void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region
{
    if ([region isKindOfClass:[CLCircularRegion class]]) {
        [self handleRegionEvent:region];
    }
}

Answer 1

您在 iOS 中只能同时监控 20 个位置。见Apple's documentation。另外，请确保您通过requestAlwaysAuthorization 请求许可。

绕过此限制的一种方法是找到离用户最近的 19 家商店并监控这些区域，然后使用第 20 区域作为围绕用户当前位置的外边界，其半径是到第 19 家商店的距离。当用户越过外边界时，重新计算最近的 19 家商店和边界，并重复。在代码中，你会做这样的事情。 （请注意，我没有测试此代码；这只是一个示例。）

- (void)installClosestGeofencesTo:(CLLocation *)currentLocation {
    [self removeAllGeofences];
    NSArray *closestStores = [self findClosestStoresTo:currentLocation limit:19];
    for (Store *store in closestStores) {
        CLCircularRegion *region = [[CLCircularRegion alloc] initWithCenter:store.location radius:100 identifier:store.identifier];
        [self.locationManager startMonitoringForRegion:region];
    }
    Store *furthestStore = [closestStores lastObject];
    CLCircularRegion *boundaryRegion = [[CLCircularRegion alloc] initWithCenter:currentLocation.coordinate radius:furthestStore.distance identifier:@"boundary"];
    [self.locationManager startMonitoringForRegion:boundaryRegion];
}

- (void)removeAllGeofences {
    NSArray *monitoredRegions = [self.locationManager monitoredRegions];
    for (CLRegion *region in monitoredRegions) {
        [self.locationManager stopMonitoringForRegion:region];
    }
}

- (NSArray *)findStoresClosestTo:(CLLocation *)location limit:(NSUInteger)limit {
    ...
}

在您的CLLocationManagerDelegate 中，您可以执行以下操作：

- (void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region
{
    if ([region.identifier isEqual:@"boundary"]) {
        [self installClosestGeofencesTo:self.locationManager.location];
    }
}