當應用程序被殺時，位置不會在行走時更新

Question

我有一個功能，當應用程序被殺或終止時，我應該獲得位置的緯度和經度。

當我騎車時，我會在應用被殺/終止時獲得經緯度。

但是當我開始走幾分鍾然后我就沒有得到應用程序被殺/終止的經度和經度。

以下是我的邏輯。

+ (CLLocationManager *)sharedLocationManager {
static CLLocationManager *_locationManager;

@synchronized(self) {
    if (_locationManager == nil) {
        _locationManager = [[CLLocationManager alloc] init];
        _locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
        _locationManager.allowsBackgroundLocationUpdates = YES;
        _locationManager.pausesLocationUpdatesAutomatically = NO;
        _locationManager.activityType = CLActivityTypeOther;
        _locationManager.distanceFilter = kCLDistanceFilterNone;
    }
}
      return _locationManager; 
}

 - (id)init {
    if (self==[super init]) {
    //Get the share model and also initialize myLocationArray
    self.shareModel = [LocationShareModel sharedModel];
    self.shareModel.myLocationArray = [[NSMutableArray alloc]init];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationEnterBackground) name:UIApplicationDidEnterBackgroundNotification object:nil];
}
    return self;
}

-(void)applicationEnterBackground{
CLLocationManager *locationManager = [LocationTracker sharedLocationManager];
locationManager.delegate = self;
[locationManager stopMonitoringSignificantLocationChanges];

if(IS_OS_8_OR_LATER) {
    [locationManager requestAlwaysAuthorization];
}
[locationManager startMonitoringSignificantLocationChanges];

//Use the BackgroundTaskManager to manage all the background Task
self.shareModel.bgTask = [BackgroundTaskManager sharedBackgroundTaskManager];
[self.shareModel.bgTask beginNewBackgroundTask];
}

以上是我從appdelegate調用的Locationmanager類

在AppDelegate.m文件中，我寫了如下

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

 UIAlertView * alert;

//We have to make sure that the Background App Refresh is enable for the Location updates to work in the background.
if([[UIApplication sharedApplication] backgroundRefreshStatus] == UIBackgroundRefreshStatusDenied){

    alert = [[UIAlertView alloc]initWithTitle:@""
                                      message:@"The app doesn't work without the Background App Refresh enabled. To turn it on, go to Settings > General > Background App Refresh"
                                     delegate:nil
                            cancelButtonTitle:@"Ok"
                            otherButtonTitles:nil, nil];
    [alert show];

}else if([[UIApplication sharedApplication] backgroundRefreshStatus] == UIBackgroundRefreshStatusRestricted){

    alert = [[UIAlertView alloc]initWithTitle:@""
                                      message:@"The functions of this app are limited because the Background App Refresh is disable."
                                     delegate:nil
                            cancelButtonTitle:@"Ok"
                            otherButtonTitles:nil, nil];
    [alert show];

} else{
    self.locationTracker = [[LocationTracker alloc]init];
    [self.locationTracker startLocationTracking];

        //Send the best location to server every 60 seconds
        //You may adjust the time interval depends on the need of your app.
    if ([launchOptions objectForKey:UIApplicationLaunchOptionsLocationKey]) {

        NSTimeInterval time = 10;
        self.locationUpdateTimer =
        [NSTimer scheduledTimerWithTimeInterval:time
                                         target:self
                                       selector:@selector(updateLocation)
                                       userInfo:nil
                                        repeats:YES];
    }


}

return YES;
}

有小費嗎 ？？ 謝謝...

Answer 1

您要求“重要位置變更”。 我對API和相關區域監測的研究和經驗是，由於它使用蜂窩塔代替GPS，因此分辨率非常粗糙。 我們嘗試在30米處使用它並且它不穩定。 我們把它撞到了100米，它更好。 似乎大多數人建議200米用於區域監測，因此步行不太可能在一段時間內引發“重大位置變化”並不奇怪，因為在幾分鍾內行走200米是很長的路。