Location Manager update frequency, iphone

问题

I have a CLLocation manager called "myLocation".

myLocation = [[CLLocationManager alloc] init];
    myLocation.desiredAccuracy = kCLLocationAccuracyBestForNavigation ;
    myLocation.distanceFilter = 10 ;
    myLocation.delegate=self;



    locationEnabledBool = [CLLocationManager locationServicesEnabled];



    if (locationEnabledBool ==NO || ( [CLLocationManager  authorizationStatus] == kCLAuthorizationStatusDenied)) {

    //  LocationText.text = @"Location Service Disabled ";
        UIAlertView *locationAlert = [[UIAlertView alloc] initWithTitle:@"Location Service Disabled" 
                                                        message:@"To re-enable, please go to Settings and turn on Location Service for this app." 
                                                       delegate:nil 
                                              cancelButtonTitle:@"OK" 
                                              otherButtonTitles:nil];
        [locationAlert show];
        [locationAlert release];

    }

        [myLocation startUpdatingLocation];

and location update function is

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

NSLog(@"old location is %f, %f ", oldLocation.coordinate.latitude, oldLocation.coordinate.longitude);
NSLog(@"new location is %f,%f",newLocation.coordinate.latitude, newLocation.coordinate.longitude );
}

Is there a way to find frequency of location manager update, and If it can be increased or decreased?

回答1:

Your location update starts only when you call the method [locationManager startUpdatingLocation].

You can control the frequency of the update using an NSTimer. Call the startUpdatingLocation method at regular intervals whenever you need a location update and then immediately call the stopUpdatingLocation method. The next time you will get a location update only at the interval you have set in the NSTimer.

回答2:

For detecting even the slightest of movements, you need to set

myLocation.distanceFilter = kCLDistanceFilterNone ; 

But, please keep in mind,letting location manager to generate updates for even the slightest of movements can end up in lot of battery usage.

来源：https://stackoverflow.com/questions/7385102/location-manager-update-frequency-iphone