如何在Facebook上发布路线图不是图像

Facebook正在提供发布路线图的新功能，而不是地图的图像。我已经检查了他们的文档，我发现这个代码，但我得到了很多的工作。

facebook is providing new feature to post route map and not image of map. i have checked their documentation and I found this code but i am getting much what to do

他们给了这种代码

NSMutableDictionary<FBGraphObject> *action = [FBGraphObject graphObject];action[@"course"] = @"http://samples.ogp.me/136756249803614";

[FBRequestConnection startForPostWithGraphPath:@"me/fitness.walks"
                                   graphObject:action
                             completionHandler:^(FBRequestConnection *connection,
                                                 id result,
                                                 NSError *error) {
                                 // handle the result
                             }];