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我正在为我的应用程序使用 iOS Facebook SDK。我的应用需要访问用户的朋友照片。然而，一些用户拒绝应用程序访问他们的照片。我想做的是过滤那些不允许应用访问他们的照片的朋友。我目前的方法是让所有朋友将 uid 保存在一个数组中，然后删除那些共享 0 张照片的朋友。这种方法的问题是效率非常低且缓慢。

您知道是否有任何方法可以使用 FQL 或 Graph API 查询该特定用户的好友权限？

以下是我目前（非常慢）的方法。

- (void)retrieveFacebookFriends
{
    if (FBSession.activeSession.isOpen)
    {
        FBRequestConnection *fbConnection = [[FBRequestConnection alloc] init];

        NSMutableArray *arrayOfFriendIDS = [[NSMutableArray alloc] init];
        NSMutableArray *arrayOfFriendsNames = [[NSMutableArray alloc] init];

        [fbConnection addRequest:[FBRequest requestForMyFriends] completionHandler:^(FBRequestConnection *connection, id result, NSError *error) {

            if (!error)
            {
                FBGraphObject *graphObject = (FBGraphObject *)result;

                id content = [graphObject objectForKey:@"data"];

                if ([content count] > 0)
                {
                    //sort the friends by name
                    NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:@"first_name"  ascending:YES];
                    [content sortUsingDescriptors:[NSArray arrayWithObjects:descriptor,nil]];

                    id value;
                    for (value in content)
                    {
                        [arrayOfFriendIDS addObject:[value objectForKey:@"id"]];
                        [arrayOfFriendsNames addObject:[value objectForKey:@"name"]];
                    }

                    NSInteger size = [arrayOfFriendIDS count];
                    NSMutableArray *data = [[NSMutableArray alloc] initWithCapacity:size];
                    for (NSInteger i = 0; i < size; i++)
                    {
                        FriendRecord *record = [[FriendRecord alloc] init];
                        record.friendID = [arrayOfFriendIDS objectAtIndex:i];
                        record.name = [arrayOfFriendsNames objectAtIndex:i];
                        [data addObject:record];
                    }
                    self.friendRecords = [NSArray arrayWithArray:data];

                    dispatch_async(dispatch_get_main_queue(), ^{
                        [self.tableView reloadData];
                    });

                    __block NSMutableArray *tmpArray = [self.friendRecords mutableCopy];
                    __block int counter = 0;
                    for (value in content)
                    {
                        FBRequest *fql = [FBRequest requestForGraphPath:@"fql"];
                        [fql.parameters setObject:[NSString stringWithFormat:@"SELECT object_id FROM photo WHERE aid IN (SELECT aid FROM album WHERE owner=%@)",[value objectForKey:@"id"]]
                                           forKey:@"q"];

                        [fql startWithCompletionHandler:^(FBRequestConnection *connection,
                                                          id result,
                                                          NSError *error) 
                        {
                            counter++;

                            if (!error)
                            {
                                id permissionData = [result objectForKey:@"data"];                                
                                if ([permissionData count] == 0)
                                {
                                    FriendRecord *record = [[FriendRecord alloc] init];
                                    record.friendID = [value objectForKey:@"id"];
                                    record.name = [value objectForKey:@"id"];
                                    [tmpArray removeObject:record];
                                }
                            }
                            else
                            {
                                NSLog(@"error %@", error);
                            }
                            //check if it is the last record
                            if (counter == [self.friendRecords count])
                            {
                                self.friendRecords = [NSArray arrayWithArray:tmpArray];

                                dispatch_async(dispatch_get_main_queue(), ^{
                                    NSLog(@"filtering is finished");
                                    [self.tableView reloadData];
                                });
                            }
                        }];  
                    }
                }
            }
        }];
        [fbConnection start];
    }
    else
    {
        //open a facebook session
    }
}

好的，我使用这个非常快的 FQL 查询部分解决了问题！

select uid, name from user where uid in (select owner from album where owner in (select uid2 from friend where uid1 = me())) order by name

但是，一些与应用程序共享照片的朋友不包含在此查询的答案中！起初我以为是因为他们没有个人专辑，但后来证实不是这样，我不知道为什么。

你能帮我解决这个奇怪的问题吗？非常感谢！

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