在iOS上使用GTLQueryYoutube查询时如何实现fileDetails部分

Question

我正在使用GTLQueryYoutube获取已上传视频的列表。我实际上登录了我的Google帐户。使用以下代码获取上传的视频

//Get my channel
GTLQueryYouTube *channelsListQuery = [GTLQueryYouTube queryForChannelsListWithPart:@"contentDetails"];

    channelsListQuery.mine = YES;

    youtubeService.APIKey = kGoogleClientAPIKey;

    // This callback uses the block syntax

    [youtubeService executeQuery:channelsListQuery completionHandler:^(GTLServiceTicket *ticket, GTLYouTubeChannelListResponse*response, NSError *error) {
            if (error) {
                //Process error later
                return;
            }

            if ([[response items] count] > 0) {
                //Get Uploaded ids
                GTLYouTubeChannel *channel = response[0];

                NSString *uploadsPlaylistId = channel.contentDetails.relatedPlaylists.uploads;

                GTLQueryYouTube *playlistItemsListQuery = [GTLQueryYouTube queryForPlaylistItemsListWithPart:@"contentDetails"];
                playlistItemsListQuery.maxResults = 20l;
                playlistItemsListQuery.playlistId = uploadsPlaylistId;
                playlistItemsListQuery.mine = YES;

                [youtubeService executeQuery:playlistItemsListQuery completionHandler:^(GTLServiceTicket *ticket, GTLYouTubePlaylistItemListResponse *response, NSError *error) {
                        if (error) {
                            return;
                        }

                        NSMutableArray *videoIds = [NSMutableArray arrayWithCapacity:response.items.count];

                        for (GTLYouTubePlaylistItem *playlistItem in response.items) {

                            [videoIds addObject:playlistItem.contentDetails.videoId];

                        }

                        GTLQueryYouTube *videosListQuery = [GTLQueryYouTube queryForVideosListWithPart:@"id, contentDetails, snippet, **fileDetails**"];
                        videosListQuery.identifier = [videoIds componentsJoinedByString: @","];
                        videosListQuery.mine = YES;

                        [youtubeService executeQuery:videosListQuery

                            completionHandler:^(GTLServiceTicket *ticket, GTLYouTubeVideoListResponse *response, NSError *error) {
                                if (error) {
                                    return;
                                }

                                NSArray* videoArray = response.items;

                                //Do somethings with videoArray


     }];
            }];
    }
}];

考虑“videosListQuery”查询，它有一个名为“fileDetails”的部分，因此在此查询上返回的每个视频都应该实现fileDetails属性。但结果是对比，每个视频的fileDetails属性总是为零

fileDetails属性只能由所有者检索，但我已登录，这是我上传的视频。为什么我不能找回它？