Mixing Swift and Objective C

Thank Greg - I have both the Objective C and Swift API V2 loaded - is that a problem? The function is in the viewDidLoad - it purpose is the identify the files in my Backup directory on Dropbox and display them in a NSTableView. I am a little confused what I need to use - can you call the Objective C API from Swift?

override func viewDidLoad()

    {

        super.viewDidLoad()

        let obj:DataClassOS = DataClassOS.getInstance()

        let client = DropboxClient(accessToken: obj.accesstoken)

            _ = client.files.listFolder(path: "/Backup")

                .response { response, error in

                if let result = response {

                    print("Folder contents:")

                    for entry in result.entries {

                        print(entry.name)

                    }

                } else if let error = error

                {

                    print(error)

                }

            }

    }