为什么我将高度设为0

Question

为什么在使用CoreLocation框架时将海拔高度设为0？

Answer 1

try this

    - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
    {
   altitudeLabel.text = [NSString stringWithFormat: @"%.2f m",   newLocation.altitude];
     }

Answer 2

Assuming you are testing your application on your device, the altitude will always be 0 when the update comes from Wi-Fi. Try disabling Wi-Fi to force an update from 3G. Note that it may take a while until you get an update because 3G doesn't return a position as fast as Wi-Fi.

Answer 3

Altitude comes from GPS. You need to be outdoors to get altitude. Take your device outdoor and see if you are getting altitude.