iOS add placeholder to UITextView

Viewcontroller.swift

class Viewcontroller : UIViewController, UITextViewDelegate{

  override func viewDidLoad(){
    super.viewDidLoad()
    
    textView.text = "Placeholder"
    textView.textColor = UIColor.lightGray
  }
  
  func textViewDidBeginEditing(_ textView: UITextView) {
        if textView.textColor == UIColor.lightGray {
            textView.text = nil
            textView.textColor = UIColor.black
        }
    }
    
    func textViewDidEndEditing(_ textView: UITextView) {
        if textView.text.isEmpty {
            textView.text = "Placeholder"
            textView.textColor = UIColor.lightGray
        }
    }
  ...
}