iphone - How to set Radius for CLLocationManager in IOS -


i have requirement have show alert view user, when user cross radius point. how set radius.?

first need create region using:

cllocationdegrees latitude = <your_latitude>; cllocationdegrees longitude = <your_longitude>;  cllocationcoordinate2d center = cllocationcoordinate2dmake(latitude, longitude);  cllocationdistance radius = geo_fence_radius;  clregion *region = [[clregion alloc]initcircularregionwithcenter:center radius:radius identifier:title];

next have monitor region by:

 [locationmanager startmonitoringforregion:region];

then can track users when enter or exit following delegate methods:

- (void)locationmanager:(cllocationmanager *)manager          didenterregion:(clregion *)region  {        //show alert entered region  } - (void)locationmanager:(cllocationmanager *)manager           didexitregion:(clregion *)region  {     //show alert exited region  }  - (void)locationmanager:(cllocationmanager *)manager didstartmonitoringforregion:(clregion *)region  {   }  - (void)locationmanager:(cllocationmanager *)manager monitoringdidfailforregion:(clregion *)region               witherror:(nserror *)error    {   }

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