Set Placeholder in UiTextView in swift 3

//In viewdidLoad add this

      

        DiscriptionTV.text = "Discription"

        DiscriptionTV.textColor = UIColor.lightGray

        DiscriptionTV.delegate = self

        DiscriptionTV.layer.borderColor = UIColor.lightGray.cgColor;

then

 //Mark:- textView Delegates

    

    func textViewDidBeginEditing(_ textView: UITextView) {

        if DiscriptionTV.textColor == UIColor.lightGray {

            DiscriptionTV.text = nil

            DiscriptionTV.textColor = UIColor.white

            DiscriptionLab.isHidden = false

        }

    }

    

    func textViewDidEndEditing(_ textView: UITextView) {

        if DiscriptionTV.text.isEmpty {

            DiscriptionTV.text = "Discription"

            DiscriptionTV.textColor = UIColor.lightGray

             DiscriptionLab.isHidden = true

        }

    }

Here:- DiscriptionTV = UITextView

Happy Coding :)