title: set OFF all UISwitches except current in tableViewCell
body: <p>I need to that the user to be able choose just one value from cells.</p>
  
  <pre><code>@objc func switchChangedPeriod(_ sender : UISwitch!){
      if sender.isOn{
          periodUserString = period[sender.tag].periodUser
          periodSystemString = period[sender.tag].periodSystem
          //sender.setOn(false, animated: true) how to set OFF all switches except current
      }else{
          periodUserString = ""
          periodSystemString = ""
      }
  }
  </code></pre>
  
  <p>Or maybe i need to set OFF just previous UISwitch?</p>