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Home/ Questions/Q 5847465
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Editorial Team
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Editorial Team
Asked: May 22, 20262026-05-22T12:43:20+00:00 2026-05-22T12:43:20+00:00

I guess what I am trying to do should be simple, but don’t know

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I guess what I am trying to do should be simple, but don’t know how to search for it!

What I wanna do is: the user will vote for a music, but the user can only vote if he is 2km away from a fixed location (lat,lon).

Can you suggest some links that can help me implement this?!

Cheers.

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1 Answer

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  1. Editorial Team
    Editorial Team
    2026-05-22T12:43:21+00:00Added an answer on May 22, 2026 at 12:43 pm

    Something like this…

    @interface YourLocationViewController : UIViewController <CLLocationManagerDelegate> 
    CLLocationManager *locationManager;
    

    …

    /**
     * Start tracking updates for location. 
     * Call this from viewLoad or something.
     */
    -(void) trackUpdates {
    
        self.locationManager = [[[CLLocationManager alloc] init] autorelease];
        self.locationManager.delegate = self;
    
        /* Pinpoint our location with the following accuracy:
         *
         *     kCLLocationAccuracyBestForNavigation  highest + sensor data
         *     kCLLocationAccuracyBest               highest     
         *     kCLLocationAccuracyNearestTenMeters   10 meters   
         *     kCLLocationAccuracyHundredMeters      100 meters
         *     kCLLocationAccuracyKilometer          1000 meters 
         *     kCLLocationAccuracyThreeKilometers    3000 meters
         */
        self.locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;
    
        /* Notify changes when device has moved x meters.
         * Default value is kCLDistanceFilterNone: all movements are reported.
         */
        self.locationManager.distanceFilter = 10.0f;
    
        // update location
        if ([CLLocationManager locationServicesEnabled]){
            [self.locationManager startUpdatingLocation];
        }
    }
    
    - (void)locationManager:(CLLocationManager *)manager 
        didUpdateToLocation:(CLLocation *)newLocation
               fromLocation:(CLLocation *)oldLocation {
        CLLocationDistance meters = [newLocation distanceFromLocation:fixedPoint];
        if (meters>2000){
            // drink a shot
        }
    }
    
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