Getting a list of folders in base directory for Google Drive iOS in Swift 3?

Question

Using GoogleSignIn and GoogleAPIClientForREST, I've been able to sign in to google and even get a list of files just fine using code taken from the Google Drive iOS quickstart. Really what I don't understand is how to filter out results from the request by file type, or really how to get contents of a subfolder. Google Drive REST documentation hasn't helped at all.

To clarify the issue: while

let query = GTLRDriveQuery_FilesList.query()

query.pageSize = 10

service.executeQuery(query,
                             delegate: self,
                             didFinish: #selector(displayResultWithTicket(ticket:finishedWithObject:error:)))

works perfectly with

func displayResultWithTicket(ticket: GTLRServiceTicket,
                             finishedWithObject result : GTLRDrive_FileList,
                             error : NSError?) {

    if let error = error {
        print(error.localizedDescription)
        return
    }

    var text = "";

    if let files = result.files, !files.isEmpty {

        text += "Files:\n"
        for file in files {
            text += "\(file.name!) (\(file.identifier!))\n"
        }
    } else {
        text += "No files found."
    }
    print(text)
}

, I have no idea how to get only the folders or how to get files in a subfolder.

Answer 1

For Listing Folders we want to Declare the mimeType Just Like this

  let root = "(mimeType = 'application/vnd.google-apps.folder' or mimeType = 'image/jpeg' or mimeType = 'image/png' or mimeType = 'application/pdf' or mimeType = 'application/epub' or mimeType = 'application/msword' or mimeType = 'application/vnd.openxmlformats-officedocument.wordprocessingml.document') and '\(root)' in parents and trashed=false"

Now you can pass this root for list only your required needs

func GoogleDrivelistFiles(root : String) { //root 
    let query = GTLRDriveQuery_FilesList.query()
    query.pageSize = 100
    query.q = root
    query.fields = "files(id,name,mimeType,modifiedTime,createdTime,fileExtension,size,parents,kind),nextPageToken"
    service.executeQuery(query, completionHandler: {(ticket, files, error) in
        if let filesList : GTLRDrive_FileList = files as? GTLRDrive_FileList {

            var cloudArray = Array<FileObject>()
            if let filesShow : [GTLRDrive_File] = filesList.files {
                for Array in filesShow {
                    let name = Array.name
                    let mimeType = Array.mimeType
                    let id = Array.identifier
                    let folder = (mimeType as NSString?)?.pathExtension
                    let isfolder = true
                    let parents = Array.parents
                    var parentPath : String!
                    for arrayParents in parents! {
                        parentPath = arrayParents
                    }

                    let creationTime = Array.createdTime?.date
                    let modifiedTime = Array.modifiedTime?.date
                    let fileSize : Int!
                    let fileExtension : String!
                    if isfolder == true {
                        fileSize = 0
                        fileExtension = "Folder"
                    }else {
                        fileSize = Array.size?.intValue
                        fileExtension = Array.fileExtension
                    }
                    if folder == "folder" {
                    let content = FileObject(path: mimeType!, isFolder: true, parentPath: parentPath!, fileName: name!, creationDate: creationTime!, lastModified: modifiedTime!, fileSize: fileSize!, fileExtension: fileExtension!, fileId: id!, isSyncing: true)
                    cloudArray.append(content)
                    } else {
                        let content = FileObject(path: mimeType!, isFolder: false, parentPath: parentPath!, fileName: name!, creationDate: creationTime!, lastModified: modifiedTime!, fileSize: fileSize!, fileExtension: fileExtension!, fileId: id!, isSyncing: true)
                        cloudArray.append(content)
                    }
                }
            }
            DispatchQueue.main.async {
            self.delegate?.DataRefresh(fileObject: cloudArray)
            }

        }else {

        }
    })
}

For getting the subFolder also you can write on didSelectTable and you want to pass this root to the same func GoogleDriveListFiles().

//ForGeting SubFolders//
 func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let FolderId = array[indexpath.row].id
 //important step
 let FolderIdroot = "(mimeType = 'application/vnd.google-apps.folder' or mimeType = 'image/jpeg' or mimeType = 'image/png' or mimeType = 'application/pdf' or mimeType = 'application/epub' or mimeType = 'application/msword' or mimeType = 'application/vnd.openxmlformats-officedocument.wordprocessingml.document') and '\(FolderId)' in parents and trashed=false"

  //now you can call that fun which I have already written for listingFiles func GoogleDrivelistFiles(root :String)//

   GoogleDrivelistFiles(root : FolderIdRoot)
 }