Lesson 3 presented March 4th 2014

gistfile1.m

//DORouteMapViewController interface
@property (strong, nonatomic) MKPlacemark *origin;
@property (strong, nonatomic) MKPlacemark *destination;

//this method is called while transitioning from the search view to the map view
-(void)mapFromLocation:(NSString *)fromLocation toLocation:(NSString *)toLocation
{
    //geocode the from location and handle the returned placemark
    [[[CLGeocoder alloc] init] geocodeAddressString:fromLocation completionHandler:^(NSArray *placemarks, NSError *error) {
        //grab the first placemark and set it as the origin placemark
        self.origin = [[MKPlacemark alloc] initWithPlacemark:[placemarks firstObject]];
        //add the origin placemark to the map
        [self.mapView addAnnotation:self.origin];
        
        //check if the destination has also been set
        if (self.destination) {
            //we have the origin and destination; next step is to getAndDisplayTravelTime
            [self getAndDisplayTravelTime];
        }
    }];
    
    //do the same process for the to location
    [[[CLGeocoder alloc] init] geocodeAddressString:toLocation completionHandler:^(NSArray *placemarks, NSError *error) {
        self.destination = [[MKPlacemark alloc] initWithPlacemark:[placemarks firstObject]];
        [self.mapView addAnnotation:self.destination];
        if (self.origin) {
            [self getAndDisplayTravelTime];
        }
    }];
}