PlaceholderTextView.swift

class PlaceholderTextView: UIView, UITextViewDelegate {

    private var textView: UITextView!
    private var isShowingPlaceholder = false

    var placeholder = "" {
        didSet {
            showPlaceholderIfNeeded()
        }
    }

    var text: String {
        get {
            return isShowingPlaceholder ? "" : textView.text
        }
        set {
            hidePlaceholderIfNeeded()
            textView.text = newValue
            showPlaceholderIfNeeded()
        }
    }

    var textColor = UIColor.blackColor() {
        didSet {
            if !isShowingPlaceholder {
                textView.textColor = textColor
            }
        }
    }

    // Add textView property setter as needed
    var font: UIFont? {
        get { return textView.font }
        set { textView.font = newValue }
    }

    convenience init() {
        self.init(frame: CGRectZero)

        textView = addSubview(UITextView()) { view in
            view.delegate = self
            view.snp_makeConstraints { make in
                make.edges.equalTo(self)
            }
        }
    }

    private func showPlaceholderIfNeeded() {
        if text == "" || isShowingPlaceholder {
            isShowingPlaceholder = true
            textView.textColor = UIColor.lightGrayColor()
            textView.text = placeholder
        }
    }

    private func hidePlaceholderIfNeeded() {
        if isShowingPlaceholder {
            isShowingPlaceholder = false
            textView.text = ""
            textView.textColor = textColor
        }
    }

    func textViewDidBeginEditing(textView: UITextView) {
        hidePlaceholderIfNeeded()
    }

    func textViewDidEndEditing(textView: UITextView) {
        showPlaceholderIfNeeded()
    }

}