iphone - CLLocationCoordinate2D currentCentre not returning lat/long -

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cllocationcoordinate2d currentcentre; not returning lat/long when use method in viewdidload if use viewdidappear works lat/long coming somewhere else(not accurate). on viewdidload or viewdidapear execute [self querygoogleplaces:@"grocery"]; i'm new nice please

-(void)viewdidload { [super viewdidload]; // additional setup after loading view, typically nib.  //back button uibarbuttonitem *back = [[uibarbuttonitem alloc] initwithtitle:@"back" style:uibarbuttonitemstyleplain target:nil action:nil]; [[self navigationitem] setbackbarbuttonitem:back];    self.mapview.delegate = self;         locationmanager = [[cllocationmanager alloc] init];   [locationmanager setdelegate:self];   [locationmanager setdistancefilter:kcldistancefilternone]; [locationmanager setdesiredaccuracy:kcllocationaccuracybest];   [self.mapview setshowsuserlocation:yes];    firstlaunch=yes; imagename=[[nsstring alloc] init]; imagename=[nsstring stringwithformat:@"park.png"]; [self querygoogleplaces:@"grocery"];  }   -(void) querygoogleplaces: (nsstring *) googletype {  // build url string going sent google. note: kgoogle_api_key constant should contain own api key can obtain google. see link more info: // https://developers.google.com/maps/documentation/places/#authentication  nsstring *url = [nsstring stringwithformat:@"https://maps.googleapis.com/maps/api/place/search/json?location=%f,%f&radius=%@&keyword=%@&sensor=true&key=%@", currentcentre.latitude, currentcentre.longitude, [nsstring stringwithformat:@"%i", currendist], googletype, kgoogle_api_key];   nslog(@"test: %@",url);  //formulate string url object. nsurl *googlerequesturl=[nsurl urlwithstring:url]; //nslog(url); // retrieve results of url. dispatch_async(kbgqueue, ^{     nsdata* data = [nsdata datawithcontentsofurl: googlerequesturl];     [self performselectoronmainthread:@selector(fetcheddata:) withobject:data waituntildone:yes]; });

}

my .h code 

@interface mapviewcontroller : uiviewcontroller<mkmapviewdelegate,cllocationmanagerdelegate>  {  cllocationmanager *locationmanager;   nsstring *imagename; bool firstlaunch;  cllocationcoordinate2d currentcentre; int currendist;   } @property (strong, nonatomic) iboutlet mkmapview *mapview;  -(void) querygoogleplaces: (nsstring *) googletype; @end

but if call in button works so

- (ibaction)toolbarbuttonpresses:(id)sender {   imagename=[[nsstring alloc] init]; imagename=[nsstring stringwithformat:@"park.png"];  [self querygoogleplaces:@"grocery"];   }

you need call [locationmanager startupdatinglocation]; in viewdidload , check has returned valid location querying location property - checking isn't nil. might taking while return result, when rest of code executes there isn't valid value. might able use – locationmanager:didupdatetolocation:fromlocation: – locationmanager:didfailwitherror: method in cllocationmanagerdelegate protocol handle this.


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