iphone - locationManager:didUpdateLocations: always be called several times -


i start updating current location when view did appear, , stop updating location whenever locationmanager:didupdatelocations: called. why locationmanager:didupdatelocations: called several times? have missed?

#import "viewcontroller.h"  @interface viewcontroller (){     cllocationmanager *locationmanager; // location manager current location } @end  @implementation viewcontroller - (void)viewdidload {     [super viewdidload]; }  - (void)viewdidappear:(bool)animated {     [super viewdidappear:animated];     [self startupdatingcurrentlocation]; }  - (void)startupdatingcurrentlocation {     if (!locationmanager)     {         locationmanager = [[cllocationmanager alloc] init];         [locationmanager setdelegate:self];         locationmanager.distancefilter = 10.0f; // don't need more accurate 10m     }     [locationmanager startupdatinglocation]; }  -(void)locationmanager:(cllocationmanager *)manager didupdatelocations:(nsarray *)locations{     [locationmanager stopupdatinglocation]; } @end

probably depends accuracy set locationmanager. have 3 kinds o localization cell radio, wifi map, gps. if set best accuracy location manager continue check position, if location better accuracy out of range of distance filter delegate method called again.


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