“操作”中不显示“打开图形对象”标题

Question

我创建了一个定义了标题的对象。发布后，我使用对象浏览器确认它的标题设置正确。尽管如此，动作显示的是名词，而不是标题（就好像对象没有定义标题）。

我期望看到：“报道Texaco的燃油价格”

我得到的结果：“在车站报告燃油价格”

我正在使用的代码：

- (void)postToFacebook
{
id<FBOpenGraphObject> graphObject = [FBGraphObject openGraphObjectForPost];

graphObject[@"title"] = @"My Title"
graphObject[@"type"] = @"myappnamespace:myobject";
graphObject[@"description"] = @"My Object Description";
graphObject[@"image"] = @[@{@"url": @"http://example.com", @"user_generated" : @"false"}];
graphObject[@"url"] = @"http://example.com";

[FBRequestConnection startForPostOpenGraphObject:graphObject
                               completionHandler:^(FBRequestConnection *connection, id result, NSError *error)
 {
     NSString *objectId = [result objectForKey:@"id"];
     NSLog(@"Open Graph Object Posted: %@", objectId);

     // create an Open Graph action
     id<FBOpenGraphAction> action = (id<FBOpenGraphAction>)[FBGraphObject graphObject];
     [action setObject:objectId forKey:@"myobject"];
     [action setObject:@"true" forKey:@"fb:explicitly_shared"];

     // create action referencing user owned object
     [FBRequestConnection startForPostWithGraphPath:@"/me/myappnamespace:my_action" graphObject:action completionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
         if(!error) {
             NSLog(@"Action successfully posted to facebook!");
         } else {
             // An error occurred
             NSLog(@"Encountered an error posting to Open Graph: %@", error);
         }
     }];
 }];
}