问题
My app uses CLLocationManager to get location updates from the device.
I had assumed that when the device was in Airplane Mode, I would not get location updates. But I do.
The reason I assumed this is because Apple says that Airplane mode turns off Wifi, Cellular, Bluetooth, and GPS. See: http://support.apple.com/kb/ht1355
So, how is it that I'm getting a location update with a coordinate that seems reasonable?
回答1:
I've developed an app that heavily uses the user location, so I had to check this and other situations.
I've learned that when all the services are off (Bluetooth, Wi-Fi, Cell Data) CLLocationManager returns the latest known location, so, in this case, even if the device in Airplane mode it will return a location.
You can try this by getting your location, turn Airplane mode on and then go far from there, ask the location again.
TL; DR: It doesn't. It returns the latest known location.
回答2:
You can manually turn WiFi back on in Airplane Mode, and possibly get a GPS fix if you wait long enough, depending on the iDevice model.
来源：https://stackoverflow.com/questions/7376294/how-is-it-that-cllocationmanager-gets-a-location-when-airplane-mode-is-on