 File tree presenting Google Sheet. Swift 5. Xcode 13.3. iOS 15.

• The app is composed of a stack of screens, each displaying contents of a particular folder within a file tree.
• Screen can be Switched to change the layout from grid to table and vice-versa
• Tap on a folder item reveals its contents in a new screen
• User is able to return to parent folders and walk the hierarchy freely
• Each screen contain:
  • Current folder’s title
  • Each list element contains the file name and file thumbnail (“folder” of “file” icon)
• User can sign-in Google account to be able to edit sheet or read private sheets
• User is able to enter his sheetID or defullt sheet will be presented
• Data source and data format:
  • Google spreadsheet is used as a “server”. The table’s contents imitate a list of files and directories of cloud storage.
• User can add new entries in the application, and they are written to the spreadsheet.
• User can delete entries in the application using long tap, and they are deleted from the spreadsheet.
• Data model is fetched and processed on a separate thread or dispatch_queue.

• The Google Sheets API (API key, OAuth 2.0)
• Google Sign-In