SocialServiceBrowser-1.swift

//...

let configuration = SocialServiceBrowserConfigurator(client: SocialServiceBrowserDropboxClient(), selectionMode: .select)
let viewController = SocialServiceBrowserViewController(configuration: configuration, uiConfiguration: configuration)
viewController.delegate = self
present(UINavigationController(rootViewController: viewController), animated: true, completion: nil)

//...

extension ViewController: SocialServiceBrowserViewControllerDelegate {
    func socialServiceBrowser(_ socialServiceBrowser: SocialServiceBrowserViewController, didSelect node: SocialServiceBrowerNode) {
      socialServiceBrowser.importNode(node) { [weak self] node, error in
          if let node = node {
              // Show UIDocumentInteractionController for node.fileURL
          }
      }
    }
}