CLLocationManager - Calculate real time speed on iPhone - ios

Question

How can I calculate real time speed on device? I've googled a lot but all I got is to calculate distance and speed after completion of journey. Can I calculate speed at runtime?
Suggestions will be much appreciated.
Thanks in advance.

Answer 1

here CLLocationManager class provide different field of location like, Latitude, Longitude,accuracy and speed.
i use CoreLocationController so for location update i call this bellow method
you can get current speed in - (void)locationUpdate:(CLLocation *)location method like bellow
- (void)locationUpdate:(CLLocation *)location
{
NSString *currentspeed = [NSString stringWithFormat:#"SPEED: %f", [location speed]];
}
or otherwise bellow is delegate method
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
NSLog(#"in update to location");
NSString *currentspeed = [NSString stringWithFormat:#"SPEED: %f", [newLocation speed]];
}
also you can get example from this link...
http://www.vellios.com/2010/08/16/core-location-gps-tutorial/
i hope this help you...
:)

Answer 2

There is a delegate CLLocationManagerDelegate add it to your controller header file.
Initialize Location Manager and set the delegate where you implement the delegate method for location Manager like this
self.locationManager = [[CLLocationManager alloc] init];
self.locationManager.delegate = self; // send loc updates to current class
and you can write method in your class
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
NSLog(#"Location Speed: %f", newLocation.speed);
}
That's it you will get your location updates in the above method with the speed also, and it will trigger as frequent as possible.