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POCLLocationmanager gets stuck sometimes
 

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    <p>I'm working on an application which periodically obtains the user's location. The big problem is that sometimes the app gets stuck, no more updates are delivered. Even if I (kill and) restart my app, nothing changes. (The accuracy values set for location manager are near 100-200 meters.) BUT, when I start the Google Maps App, in a few seconds it gets a very accurate location (which is delivered to my app to if I switch back). Why ? Here are some relevant code parts : </p> <p>The timerFiredAction is called periodically by the timer.</p> <pre><code>-(void) timerFiredAction { if (isStillWaitingForUpdate) { successiveTimerActivationCount ++; // force LM restart if value too big , e.g. 30 ( stop + start ) return; } successiveTimerActivationCount = 0 ; isStillWaitingForUpdate = YES; /* isRecordingX is always true */ if (isSignificant &amp;&amp; isRecordingSig) [self startSignificant ]; if (isGPS &amp;&amp; isRecordingGPS) [self startGps]; } // this is called in delegate method only -(void) timerStopLocationServices { isStillWaitingForUpdate = NO; if (isGPS) [ self stopGps] ; if (isSignificant) [self stopSignificant]; } - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { // verify accuracy and stuff if ( isStillWaitingForUpdate &amp;&amp; _other_validations_ ) { // store it [self timerStopLocationServices] ; } } </code></pre> <p>The start and stop methods simply verifiy if the locationmanager is nil, if yes they call <code>createManager</code> and then call start &amp; stopUpdatingLocation.</p> <p>The creation of the LM looks like this : </p> <pre><code>-(void)createManager { @synchronized (self) { if (locationManager != nil) { [self releaseManager]; // stop timer, stop updating , reelase previous if exists } locationManager = [[CLLocationManager alloc] init]; locationManager.delegate = self; double desired; // accuracy is an init param, snap to one smaller constant // generally 100-200 if (accuracy &gt;= kCLLocationAccuracyThreeKilometers) desired = kCLLocationAccuracyThreeKilometers; else if (accuracy &gt;= kCLLocationAccuracyKilometer) desired = kCLLocationAccuracyKilometer; else if (accuracy &gt;= kCLLocationAccuracyHundredMeters) desired = kCLLocationAccuracyHundredMeters; else if (accuracy &gt;= kCLLocationAccuracyNearestTenMeters) desired = kCLLocationAccuracyNearestTenMeters; else if (accuracy &gt;= kCLLocationAccuracyBest) desired = kCLLocationAccuracyBest; else if (accuracy &gt;= kCLLocationAccuracyBestForNavigation) desired = kCLLocationAccuracyBestForNavigation; locationManager.desiredAccuracy = desired; locationManager.distanceFilter = distanceFilter; } } </code></pre> <p>Did anyone experienced something like this? Any ideas are welcome :) Thanks!</p>
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    1. COI'm a bit confused with the fired actions. Why would you like to do that? There's (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error when an error ocurred and then restart your CLManager. It's a much better way than periodically check the status (which is what I think it does your methods)
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    2. COI use that method too, but only for monitoring the errors. When the timer fires after a successful update, it sets the waiting flag. It can fire multiple times without obtaining an update (e.g. every 3 sec), in this case I don't(?) need to start the location manager and the flag is indicating that it's updating/locating right now.
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