Show keyboard with "done" toolbar.

extension UIView {

    open override func becomeFirstResponder() -> Bool {
        if (self is UITextField || self is UITextView) && inputAccessoryView == nil {
            let toolbar = UIToolbar(frame: CGRect(x: 0, y: 0,  width: bounds.size.width, height: 25))
            let flexSpace = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
            let doneBtn = UIBarButtonItem(title: "Done", style: .done, target: self, action: #selector(doneButtonAction))
            toolbar.setItems([flexSpace, doneBtn], animated: false)
            toolbar.sizeToFit()
            (self is UITextField)
                ? ((self as! UITextField).inputAccessoryView = toolbar)
                : ((self as! UITextView).inputAccessoryView = toolbar)
        }
        return super.becomeFirstResponder()
    }

    @objc private func doneButtonAction() {
        UIApplication.shared.sendAction(#selector(UIApplication.resignFirstResponder), to: nil, from: nil, for: nil)
    }

}