Directions

cf [Google Directions API page] (http://code.google.com/intl/fr-FR/apis/maps/documentation/directions/) for the behaviour of the WS.

Here is an example:

afGoogleMapsDirectionsRequest *req = [af GoogleMapsDirestionsRequest directionsRequest];
req.afDelegate = self;

[req setUseSensor:YES];
[req setUseHTTPS:NO];

[req setAvoidMode:AvoidModeTolls]; //optional, none default
[req setUnitsSystem:UnitsMetric]; //optional, metrics default

[req setTravelMode:TravelModeBicycling]; //optional, driving default

[req setOrigin:@"Paris"];

[req setDestination:@"Boulogne billancourt"];

[req setAlternatives:YES]; //optional, NO default

[req startAsynchronous];

You need to make your controller implement the delegate methods:

-(void) afDirectionsWSStarted:(afGMapsDirectionsRequest *)ws ;

-(void) afDirectionsWS:(afGMapsDirectionsRequest *)ws gotRoutes:(NSArray *)routes;

-(void) afDirectionsWSFailed:(afGMapsDirectionsRequest *)ws withError:(NSError *)er;

They are all optional, meaning that it won't matter if you don't implement them, but you'll need them for obvious reasons. Actually, you could make a synchronous request and then retrieve the values you need on the request itself.