title: How to set default label color based on dark/light mode (in Swift)
body: <p>I am trying to update my iOS app for dark mode, but am having trouble with setting the dark mode colors in code. Upon editing a UITextView, the color I want the text color to be white in dark mode, and black in light mode (which is default label color), but to my knowledge I do not know how to write this in code, how do I do it?</p>
  
  <pre><code>extension AddCardsVC: UITextViewDelegate {
      func textViewDidBeginEditing(_ textView: UITextView) {
          if #available(iOS 13.0, *) {
              definitionInput.textColor = UIColor.(need default label color)
          } else {
              definitionInput.textColor = UIColor.black
          }
          if(definitionInput.text == "organizing items into familiar, manageable units; often occurs automatically"){
              definitionInput.text = ""
          }
      }
  
  }
  </code></pre>