当应用程序被杀时如何获得准确的位置更新？

我正在开发一个基于位置的应用程序，在这个应用程序中，用户可以存储多个位置，当用户靠近存储位置时，应用程序将通过本地通知通知用户。

我用下面的代码来实现这个function：

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-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { if([[UIApplication sharedApplication] backgroundRefreshStatus] == UIBackgroundRefreshStatusDenied){ [self showAlertWithTitle:@"" andMessage:@"The app doesn't work without the Background App Refresh enabled. To turn it on, go to Settings > General > Background App Refresh."]; }else if([[UIApplication sharedApplication] backgroundRefreshStatus] == UIBackgroundRefreshStatusRestricted){ [self showAlertWithTitle:@"" andMessage:@"The functions of this app are limited because the Background App Refresh is disable."]; } else { if ([launchOptions objectForKey:UIApplicationLaunchOptionsLocationKey]) { // This "afterResume" flag is just to show that he receiving location updates self.shareModel.afterResume = YES; self.shareModel.anotherLocationManager = [[CLLocationManager alloc]init]; self.shareModel.anotherLocationManager.delegate = self; self.shareModel.anotherLocationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; //kCLLocationAccuracyBestForNavigation self.shareModel.anotherLocationManager.activityType = CLActivityTypeOtherNavigation; [self.shareModel.anotherLocationManager startUpdatingLocation]; self.shareModel.anotherLocationManager.pausesLocationUpdatesAutomatically = YES; if(IS_OS_8_OR_LATER) { if ([self.shareModel.anotherLocationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) { [self.shareModel.anotherLocationManager requestWhenInUseAuthorization]; } [self.shareModel.anotherLocationManager requestAlwaysAuthorization]; } [self.shareModel.anotherLocationManager startMonitoringSignificantLocationChanges]; } } } 

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 -(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations { CLLocation *currentLocation = [locations lastObject]; latitudeTemp = currentLocation.coordinate.latitude; longitudeTemp = currentLocation.coordinate.longitude; [self locationChangeLogic]; //If the timer still valid, return it (Will not run the code below) if (self.shareModel.timer) return; self.shareModel.bgTask = [BackgroundTaskManager sharedBackgroundTaskManager]; [self.shareModel.bgTask beginNewBackgroundTask]; //Restart the locationMaanger after 30 Seconds self.shareModel.timer = [NSTimer scheduledTimerWithTimeInterval:30 target:self selector:@selector (restartLocationUpdates) userInfo:nil repeats:YES]; //Will only stop the locationManager after 10 seconds, so that we can get some accurate locations //The location manager will only operate for 10 seconds to save battery NSTimer * delay10Seconds; delay10Seconds = [NSTimer scheduledTimerWithTimeInterval:10 target:self selector:@selector(stopLocationDelayBy10Seconds) userInfo:nil repeats:YES]; } 

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 - (void)applicationDidEnterBackground:(UIApplication *)application { [self.shareModel.anotherLocationManager startMonitoringSignificantLocationChanges]; } 

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 - (void)applicationDidBecomeActive:(UIApplication *)application { // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface. //Remove the "afterResume" Flag after the app is active again. self.shareModel.afterResume = NO; if(self.shareModel.anotherLocationManager) [self.shareModel.anotherLocationManager stopMonitoringSignificantLocationChanges]; self.shareModel.anotherLocationManager = [[CLLocationManager alloc]init]; self.shareModel.anotherLocationManager.delegate = self; self.shareModel.anotherLocationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; //kCLLocationAccuracyBestForNavigation; self.shareModel.anotherLocationManager.activityType = CLActivityTypeOtherNavigation; [self.shareModel.anotherLocationManager startUpdatingLocation]; if(IS_OS_8_OR_LATER) { if ([self.shareModel.anotherLocationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) { [self.shareModel.anotherLocationManager requestWhenInUseAuthorization]; } [self.shareModel.anotherLocationManager requestAlwaysAuthorization]; } [self.shareModel.anotherLocationManager startMonitoringSignificantLocationChanges]; } 

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通过使用上面的代码，我能够获得位置甚至是由用户杀死的应用程序，但不是它应该是准确的。 有时我没有得到的位置，有时我通过存储的位置后，我的位置。 当用户input特定半径时，我需要显示位置通知。

请帮我解决这个问题。

提前致谢。

Answer 1

区域监控（Geofencing）服务于我的要求。

您可以使用下面的链接获取更多信息：

1. https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/LocationAwarenessPG/RegionMonitoring/RegionMonitoring.html

2. http://www.rapidvaluesolutions.com/tech_blog/geofencing-using-core-location-for-regional-monitoring-in-ios-applications/

谢谢所有..