How to track user location in background?

Question

I\'m looking for an open source app or library to track user location in the background. Now I\'m trying to do it with CLLocation and background tasks, but accu

Answer 1

Here was my solution to this,

Declare the instance variable:

CLLocationManager *locationManager;

Be sure to include the delegate

<CLLocationManagerDelegate>

In viewDidLoad:

locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone; // whenever we move, location is updated
locationManager.desiredAccuracy = kCLLocationAccuracyBest; // get best current locaton coords
locationManager.headingFilter = 1;
[locationManager startUpdatingLocation];
[locationManager startUpdatingHeading];

Implement the delegate method:

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
    int degrees = newLocation.coordinate.latitude;
    double decimal = fabs(newLocation.coordinate.latitude - degrees);
    int minutes = decimal * 60;
    double seconds = decimal * 3600 - minutes * 60;
    NSString *lat = [NSString stringWithFormat:@"%d° %d' %1.4f\"",
                     degrees, minutes, seconds];
    NSLog(@" Current Latitude : %@",lat);
    latitudeLocation.text = lat;
    degrees = newLocation.coordinate.longitude;
    decimal = fabs(newLocation.coordinate.longitude - degrees);
    minutes = decimal * 60;
    seconds = decimal * 3600 - minutes * 60;
    NSString *longt = [NSString stringWithFormat:@"%d° %d' %1.4f\"",
                       degrees, minutes, seconds];
    NSLog(@" Current Longitude : %@",longt);
    longitudeLocation.text = longt;
}

Answer 2

You need to add in your "Info.plist" file the key UIBackgroundModes (array) with the value "location" (app registers for location updates). You can check all background modes here.

Answer 3

Disclaimer: I work for Cintric

We also wanted to be able to accurately track a users location in background (even after the app had been killed). We spent a long time solving the problem, especially focusing on battery drain.

We posted a great blog post on how we solved it. And also are providing a drag and drop SDK solution. It's not open source but you can integrate it for free:

You can download the .framework file, drag it into your project and initialize with one line of code: [CintricFind initWithApiKey:@"YOUR_API_KEY_HERE" andSecret:@"YOUR_SECRET_HERE"];

You can get an API key for free. There are docs explaining everything here.

Answer 4

you don't ask for code. You ask for: "I'm looking for an open source app or library"

It may help you to visit this website.

hope it helps you,

Also a tutorial.

Answer 5

Use

kCLLocationAccuracyBestForNavigation

check this.

Answer 6

Your problem is the background handler. Remove it and enable gps background mode in plist file. then you should get full power gps all the time.

Set property pausesLocationUpdatesAutomatically=NO

This is new in ios6.

From CLLocationManager:

Allowing the location manager to pause updates can improve battery life on the target device without sacrificing location data. When this property is set to YES, the location manager pauses updates (and powers down the appropriate hardware) at times when the location data is unlikely to change. For example, if the user stops for food while using a navigation app, the location manager might pause updates for a period of time. You can help the determination of when to pause location updates by assigning a value to the activityType property.

The default value of this property is YES.

For analysis add these methods to your LocationManager delegate:

- (void)locationManagerDidPauseLocationUpdates:(CLLocationManager *)manager {
     NSLog(@"locMan: locationManagerDidPauseLocationUpdates");
}

- (void)locationManagerDidResumeLocationUpdates:(CLLocationManager *)manager {
    NSLog(@"locMan: locationManagerDidResumeLocationUpdates");
}