Is it possible to call alert "Allow to use current location" manually when using CoreLocation framework?
Ortwin Gentz
No, it's automatically displayed when the app accesses Core Location. If the user rejects it, it's displayed a second time at the next launch, then it keeps quiet and isn't shown anymore.
See this answer how to detect if the user rejected the request.
来源：https://stackoverflow.com/questions/3749648/is-it-possible-to-call-alert-allow-to-use-current-location-manually