Lesson 4 presented March 4th 2014

gistfile1.m

- (void)getAndDisplayTravelTime
{
    //create request
    MKDirectionsRequest *request = [[MKDirectionsRequest alloc] init];
    [request setSource:[[MKMapItem alloc] initWithPlacemark:self.origin]];
    [request setDestination:[[MKMapItem alloc] initWithPlacemark:self.destination]];
    [request setTransportType:MKDirectionsTransportTypeAutomobile];
    
    //send request
    [[[MKDirections alloc] initWithRequest:request] calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse *response, NSError *error) {
        //handle request
        MKRoute *route = [[response routes] firstObject];
        double travelTimeInHours =[route expectedTravelTime] / 60 / 60;
        
        //prepare and show alert with driving time
        NSString *title = [NSString stringWithFormat:@"%@ to %@",self.origin.locality,self.destination.locality];
        NSString *message = [NSString stringWithFormat:@"Driving time is %.0f hours",travelTimeInHours];
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title message:message delegate:nil cancelButtonTitle:@"ok" otherButtonTitles:nil];
        [alert show];
    }];
}