How to get driving directions within my app iOS6 - ios6

Question

I am using Apple Map's in my app and on my view i want to show the driving direction from the user location to the current location that i have on the view, now i just want all this inside my app only i.e i can show the driving direction's on the mapview, I have tried using the apple map application but after i make call to it from my application it takes me to apple's map application where i get the driving direction's but i can not return back into my application so i am thinking that i can do something in my application itself so that i can get the driving directions on my current view itself ..
NSString* addr = [NSString stringWithFormat:#"http://maps.apple.com/maps?daddr=%1.6f,%1.6f&saddr=%1.6f,%1.6f",coordinate.latitude,coordinate.longitude,mapView.userLocation.coordinate.latitude,mapView.userLocation.coordinate.longitude];
NSURL* url = [[NSURL alloc] initWithString:[addr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
[[UIApplication sharedApplication] openURL:url];
this code takes me to the apple's map app from my native app but i can't return directly back to my app.is there a possible solution so that i can move back to my APP AFTER GETTING THE DRIVING DIRECTIONS ?? (webview didnot work for me.can i add a back button on apple's app or what ).Please help.... Thanks a lot !!
Or Please can any one suggest me a better code for implementing so that i can do all of that in my application only ?
I want an in-app map depicting the navigation routes and driving directions...

Answer 1

This is not the way to achieve the directions,
I have made a sample for you which covers all the iOS versions, New Google Maps and the iOS 6 tom tom maps as well.
Here it is:
if([[[UIDevice currentDevice] systemVersion] compare:#"6.0" options:NSNumericSearch] == NSOrderedDescending){
//6.0 or above
NSString *Destinationlatlong =[NSString stringWithFormat:#"%#,%#",your.latitude,your.longitude];
NSString* addr = [NSString stringWithFormat:#"comgooglemaps://?saddr=%f,%f&daddr=%#",[AppDelegate zDelegate].location.coordinate.latitude,[AppDelegate zDelegate].location.coordinate.longitude, Destinationlatlong];
addr=[addr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL* url = [[[NSURL alloc] initWithString:addr]autorelease];
// NSLog(#"url %#",url);
if ([[UIApplication sharedApplication]canOpenURL:url]) {
[[UIApplication sharedApplication] openURL:url];
}else{
CLLocationCoordinate2D coords =
CLLocationCoordinate2DMake([your.latitude doubleValue],[your.longitude doubleValue]);
MKPlacemark *placeMark = [[MKPlacemark alloc]
initWithCoordinate:coords addressDictionary:nil];
MKMapItem *destination = [[MKMapItem alloc]initWithPlacemark:placeMark];
[destination openInMapsWithLaunchOptions:nil];
}
}else{
NSString *Destinationlatlong =[NSString stringWithFormat:#"%#,%#",your.latitude,your.longitude];
NSString* addr = [NSString stringWithFormat:#"http://maps.google.com/maps?saddr=Current+Location&daddr=%#",Destinationlatlong];
addr=[addr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL* url = [[[NSURL alloc] initWithString:addr]autorelease];
// NSLog(#"url %#",url);
if ([[UIApplication sharedApplication]canOpenURL:url]) {
[[UIApplication sharedApplication] openURL:url];
}else{
UIAlertView *alert=[[[UIAlertView alloc] initWithTitle:#"Warning!" message:#"Device does not support this functionality" delegate:nil cancelButtonTitle:#"Okay" otherButtonTitles: nil]autorelease] ;
[alert show];
}
}

Answer 2

This should get you started. In short, get driving instruction from google api in json, parse it, and display it on your own map using MKPolyline
http://iosguy.com/2012/05/22/tracing-routes-with-mapkit/