判断gps是否开启

+ (BOOL)locationServicesEnabled { if (([CLLocationManager locationServicesEnabled]) && ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusAuthorized)) {	

  NSLog(@"手机gps定位已经开启");
        return YES;
    } else {

    NSLog(@"手机gps定位未开启");
        return NO;
    } 
}