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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 :)
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