CLLocationManager 委托方法未在后台调用

CLLocationManager delegate methods not being called on background

我正在构建一个应用程序来检查用户是否在我客户的商店附近,如果在附近,它会向他发送通知。

我也希望应用程序在后台检查它。

我已将此行添加到我的 info.plist 文件中:

image

这是我的代码:

AppDelegate.m:

-(BOOL)application:(UIApplication *)application willFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
[self configureLocationManager];
[self.locationManager startUpdatingLocation];

return YES;
}
-(void)configureLocationManager
{
    //Initializing locationManager
    self.locationManager=[[CLLocationManager alloc] init];
    //setting "locationManager"'s(CLLocationManager) delegate to "self"
    self.locationManager.delegate=self.monitorLocationVC;
    //Setting "locationManager"'s(CLLocationManager)'s distance filter to none
    //self.locationManager.distanceFilter=kCLDistanceFilterNone;
    //Setting "locationManager"'s(CLLocationManager)'s activityType to navigation
    self.locationManager.activityType=CLActivityTypeAutomotiveNavigation;
    //setting "locationManager"'s(CLLocationManager) desiredAccuracy to "best"
    self.locationManager.desiredAccuracy=kCLLocationAccuracyBestForNavigation;
    //If OS version is 9 or above - setting "allowsBackgroundLocationUpdates" to YES
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 9) {
        self.locationManager.allowsBackgroundLocationUpdates = YES;
    }
}

MonitorLocationViewController.m:

-(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;
        }
    }
}

有人有想法吗?谢谢!

后台位置更新

我建议您重新仔细阅读与startMonitoringSignificantLocationChanges方法相关的讨论(您必须使用此方法来解决问题)。请注意,您可以通过调用 stopMonitoringSignificantLocationChanges 然后再次调用 start... 方法来强制进行新的更新。您还需要在 locationManager:didUpdateLocations 方法中监控时间戳。

Apple 详细说明了应用程序在后台运行时获取更新所需的步骤。基本上你必须在你的应用程序委托方法中拦截一个键。此 有示例代码。

但在跳转到代码之前,请按照建议查看讨论,因为它会让您更清楚地了解如何掌握此行为。一如既往,您也将始终希望监视讨论中提到的失败委托方法。

苹果Documentation

诺塔贝内

Apple 发布了关于位置更新发送到设备的频率限制的非常重要的说明。为了节省电池电量,他们尝试限制更新次数,直到设备移动 500 米。您的测试应考虑这些限制。

资源

有关更多补充信息,请注意以下对这些 SO 问题的回答:

不幸的是,由于 NDA,我无法 post 我用于地理围栏的代码,但这篇文章可以帮助您实现您想要的:https://corgitoergosum.net/2013/01/12/geo-fencing-in-timetraveler-v2-part-i-of-3/