CLLocationManager in background thread

Question

I am doing one application.In that i am using the CLLocationManager Class for getting the updated location latitude and longitude details.But i need to use this CLLocationManager in sepaate thread .I written my code like below.

- (void)viewDidLoad
{
 [NSThread detachNewThreadSelector:@selector(fetch) toTarget:self withObject:nil];
}
-(void)fetch
 {
    manager=[[CLLocationManager alloc]init];
    manager.delegate=self;
    manager.distanceFilter=kCLDistanceFilterNone;
    manager.desiredAccuracy = kCLLocationAccuracyBest;
    [manager startUpdatingLocation];

 }
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
       fromLocation:(CLLocation *)oldLocation
 {
   NSLog(@"%f",newLocation.coordinate.latitude);
   lbl.text=[NSString stringWithFormat:@"%f",newLocation.coordinate.longitude];
 }

.But this delegate method is not fired when i run this code.So please guide me how to get the location updates in separate thread.

Are you adding the delegates in your .h file like this @interface Your_ViewController : UIViewController — superGokuN, Dec 17 '12 at 06:57

score 2 · Answer 1 · answered Jul 18 '13 at 08:06

The methods of your delegate object are called from the thread in which you started the corresponding location services. That thread must itself have an active run loop, like the one found in your application’s main thread. ——from apple document

score -1 · Answer 2 · answered Dec 17 '12 at 06:57

-1

Could you please tried with this.

 dispatch_async(newThread, ^(void) {

       [self fetch];
   });

hope you'll get solved problem.

answered Dec 17 '12 at 06:57

Sunil Targe

7,251
5
49
80

App is crashed in this line dispatch_async(newThread, ^(void) {[self fetch];}); – Kevin Char Dec 17 '12 at 07:09
And i set the location for UIBackgroundModes in Info.Plist.Because i have to tun this app in app suspended mode also. – Kevin Char Dec 17 '12 at 07:11

score -2 · Answer 3 · edited Dec 17 '12 at 08:00

in .h file

#import <CoreLocation/CoreLocation.h>
#import <MapKit/MapKit.h>

//Set Delegate  
    CLLocationManagerDelegate
// Declare
    CLLocationManager *locationManager;

in .m file

-(void)ViewDidLoad
{
    locationupadate=YES;
    locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self;
    locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    locationManager.distanceFilter = 100.0f;
    [locationManager startUpdatingLocation];
}

- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
       fromLocation:(CLLocation *)oldLocation
{

     if(locationupadate)
     {
           NSLog(@"%f",newLocation.coordinate.latitude);
          lbl.text=[NSString stringWithFormat:@"%f",newLocation.coordinate.longitude];

     }

http://stackoverflow.com/questions/10427140/call-a-function-using-thread-in-xcode — , Dec 17 '12 at 07:14

score -2 · Answer 4 · edited Dec 17 '12 at 07:58

-2

in .h file

MainView *ctl;
NSMutableDictionary *dictSubPoses;

- (id)initWithCtl:(MainView*)_ctl;

in .m file

- (id)initWithCtl:(MainView*)_ctl
{
   if(self = [super init]) 
   {
      ctl = _ctl; //[_ctl retain];
   }

   return self;
}

- (void)main 
{
   [ctl performSelector:@selector(yourMethod) withObject:dictSubPoses];
}

edited Dec 17 '12 at 07:58

Anusha Kottiyal

3,855
3
28
45

answered Dec 17 '12 at 07:43

CLLocationManager in background thread

4 Answers4

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