Weird locations from CLLocationManager in iOS9

Question

I have developed a walk app that can record distance, on iOS7, iOS8, the distance is mostly fine although sometimes not accurate, but on iOS9.0, the distance often too large, so I check

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)

Locations method, and find some time get locations like this: A、B、C, but coordinate of C is equal to A, which i think is weird

I find startUpdatingLocation called every seconds, after get rid of it , it gets better, but still happens

here is the demo source code

Answer 1

对于ios 9，必须设置allowBackgroundLocationUpdates。