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Yes, a "done" button can be developed for RxPickerViewAttributedStringAdapter. One possible approach for implementing this functionality is to add a tool bar above the picker view, which contains a "Done" button.

To implement this, first create the tool bar and add the "Done" button to it. Then, add the tool bar to the view hierarchy above the picker view. Finally, when the "Done" button is tapped, hide the tool bar and notify the RxPickerViewAttributedStringAdapter that the selection has been completed.

Here is an example implementation:

// Create the tool bar with a "Done" button
let toolBar = UIToolbar(frame: CGRect(x: 0, y: 0, width: view.frame.width, height: 44))
let doneButton = UIBarButtonItem(title: "Done", style: .done, target: self, action: #selector(didTapDoneButton))
toolBar.setItems([UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil), doneButton], animated: false)

// Add the tool bar above the picker view
let pickerView = RxPickerViewAttributedStringAdapter<String>(components: [
  ("Option 1", NSAttributedString(string: "Option 1")),
  ("Option 2", NSAttributedString(string: "Option 2")),
  ("Option 3", NSAttributedString(string: "Option 3"))
])
pickerViewSelectedValue = pickerView.rx.selectedItem.map({ $0.title }).asDriver(onErrorJustReturn: nil)
pickerView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(pickerView)
view.addSubview(toolBar)
NSLayoutConstraint.activate([
  pickerView.topAnchor.constraint(equalTo: toolBar.bottomAnchor),
  pickerView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
  pickerView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
  toolBar.topAnchor.constraint(equalTo: view.topAnchor),
  toolBar.leadingAnchor.constraint(equalTo: view.leadingAnchor),
  toolBar.trailingAnchor.constraint(equalTo: view.trailingAnchor)
])

// Handle "Done" button tap
@objc func didTapDoneButton() {
  toolBar.isHidden = true
  pickerView.selectItem(pickerView.selectedRow, animated: true, notifySelection: true)
}

In this example, the tool bar is added above the picker view using Auto Layout constraints. The RxPickerViewAttributedStringAdapter is created as usual, with its selected value being bound to a driver.

When the "Done" button is tapped, it sets the tool bar to be hidden and notifies the picker view adapter that the selection has been completed by calling the selectItem method with notifySelection set to true.

Note that this is just one possible approach for adding a "Done" button to a picker view using RxSwift. The exact implementation may vary depending on the specific requirements of the application.