UITextView+Placeholder.swift

// source: https://stackoverflow.com/questions/27652227/add-placeholder-text-inside-uitextview-in-swift

textView.text = "Placeholder"
textView.textColor = UIColor.lightGray

func textViewDidBeginEditing(_ textView: UITextView) {
    guard textView.textColor == UIColor.lightGray else { return }
    textView.text = nil
    textView.textColor = UIColor.black
}

func textViewDidEndEditing(_ textView: UITextView) {
    guard textView.text.isEmpty else { return }
    textView.text = "Placeholder"
    textView.textColor = UIColor.lightGray
}