区域监测和后台

Question

我毫无疑问，想知道是否有必要再次将所有区域重新分配给位置管理器，如果它收到appEnterInBackGround的post通知?

下面是一些代码片段

- (IBAction)startAction:(id)sender
 {
  for (Geofencing *gObjects in plotingArrays) {
        CLCircularRegion *getRegion = [self dictToRegion:gObjects];
        [monitorLocationManager startMonitoringForRegion:getRegion];
    }
  }

所以当应用程序进入后台时，我这样做:

  # pragma mark - BackGround Notification
   -(void)applicationEnterBackground
    {
      monitorLocationManager = [selectRouteController sharedLocationMonitor];
      monitorLocationManager.delegate = self;
      for (Geofencing *gObjects in plotingArrays) {
        CLCircularRegion *getRegion = [self dictToRegion:gObjects];
        [monitorLocationManager startMonitoringForRegion:getRegion];
    }
  }

所以当应用程序进入后台时，是否有必要重新分配区域给位置管理器?或者，一旦将该区域分配给startAction:操作上的位置管理器，它将自动监视

UPDATE1:

+ (CLLocationManager *)sharedLocationMonitor {
static CLLocationManager *locationMonitor;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
        locationMonitor = [[CLLocationManager alloc] init];
        locationMonitor.desiredAccuracy =  
         kCLLocationAccuracyBestForNavigation;
        locationMonitor.activityType = 
        CLActivityTypeAutomotiveNavigation;
        [locationMonitor requestAlwaysAuthorization];
        if(IS_OS_9_OR_LATER){
            locationMonitor.allowsBackgroundLocationUpdates = YES;
        }
        if(SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(@"8.4")){
            locationMonitor.pausesLocationUpdatesAutomatically = NO;
        }
    });
   return locationMonitor;
   }

PLIST:

应用程序列表配置

Answer 1

不，当你的应用程序进入后台时，你不需要重新启动区域监控。如果您已配置该区域，它将自动监视该区域。

您需要在info.plist中配置以下内容:

<key>NSLocationAlwaysUsageDescription</key>
<string>I want to get your location Information in background</string>
<key>UIBackgroundModes</key>
<array>
    <string>location</string>
</array>

你还需要设置AllowsBackgroundLocationUpdates为yes。

 [monitorLocationManager setAllowsBackgroundLocationUpdates:YES];