NSString *baseUrl=[NSString stringWithFormat:@"https://maps.googleapis.com/maps/api/directions/json?   origin=indore&destination=bhopal&key=%@&alternatives=true”,APIKey];

NSURL *url = [NSURL URLWithString:[baseUrl
stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSURLRequest *request = [NSURLRequest requestWithURL:url];

[NSURLConnection sendAsynchronousRequest:request queue:
[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse
*response, NSData *data, NSError *connectionError) {
if(!connectionError){
    NSDictionary *result= [NSJSONSerialization JSONObjectWithData:data
options:0 error:nil];
// this will return all possible roots
NSArray *routes = [result objectForKey:@"routes"];
//add The  polyline between locations.