objective c list files from google drive

Question

Am developing ios app including google drive. In google drive when am trying to list files, it displays all folders, subfolders, subfiles in single page itself. These is my code

GTLQueryDrive *query = [GTLQueryDrive queryForFilesList];

    [driveService executeQuery:query completionHandler:^(GTLServiceTicket *ticket,
                                                         GTLDriveFileList *filesList,
                                                         NSError *error) {
if (error == nil) {

            [FilesFromGoogleDrive addObjectsFromArray:filesList.items
             ];

        };

I dont want to list all files in main page. I need similar to google drive application for accessing folders, subfolders, subfiles in sequential way.Am trying this from past one week but there is no good result. So please help me how to access folders, subfolders.

Answer 1

If you want to list all files in a folder identified by folderId, you can use the following code (from https://developers.google.com/drive/v2/reference/children/list):

+ (void)printFilesInFolderWithService:(GTLServiceDrive *)service
                             folderId:(NSString *)folderId {
  // The service can be set to automatically fetch all pages of the result. More
  // information can be found on https://code.google.com/p/google-api-objectivec-client/wiki/Introduction#Result_Pages.
  service.shouldFetchNextPages = YES;

  GTLQueryDrive *query =
    [GTLQueryDrive queryForChildrenListWithFolderId:folderId];
  // queryTicket can be used to track the status of the request.
  GTLServiceTicket *queryTicket =
    [service executeQuery:query
        completionHandler:^(GTLServiceTicket *ticket,
                            GTLDriveChildList *children, NSError *error) {
          if (error == nil) {
            for (GTLDriveChildReference *child in children) {
              NSLog(@"File Id: %@", child.identifier);
            }
          } else {
            NSLog(@"An error occurred: %@", error);
          }
        }];
}

Another option is to search for files having folderId in their Parents collection:

https://developers.google.com/drive/search-parameters

For instance, you can have a search query like the following:

'1234567' in parents

Where '1234567' is the id of the folder you want to list files for.