Quick implementation of a UITextView that supports placeholder text and cursor position just like UITextField

ExampleViewController.swift

class ExampleViewController: UIViewController, UITextViewDelegate {

    @IBOutlet var placeholderInput: UIPlaceHolderTextView! {
        didSet {
            placeholderInput.placeholder = "Your custom placeholder text here"
            placeholderInput.placeholderColor = UIColor.redColor() // what ever color you want here too
            
            placeholderInput.text = placeholderInput.placeholder
            placeholderInput.textColor = placeholderInput.placeholderColor
            placeholderInput.selectedTextRange = placeholderInput.textRangeFromPosition(placeholderInput.beginningOfDocument, toPosition: placeholderInput.beginningOfDocument)
            placeholderInput.delegate = self
        }
    }
    
    // MARK: UITextViewDelegate
    func textView(textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {
        guard let placeHolderTextView = textView as? UIPlaceHolderTextView else { return true }
        
        // Combine the textView text and the replacement text to create the updated text string
        let currentText: NSString = placeHolderTextView.text
        let updatedText = currentText.stringByReplacingCharactersInRange(range, withString: text)
        
        if updatedText.isEmpty {
            // If updated text view will be empty, add the placeholder and set the cursor to the beginning of the text view
            
            placeHolderTextView.text = placeHolderTextView.placeholder
            placeHolderTextView.textColor = placeHolderTextView.placeholderColor
            
            placeHolderTextView.selectedTextRange = placeHolderTextView.textRangeFromPosition(placeHolderTextView.beginningOfDocument, toPosition: placeHolderTextView.beginningOfDocument)
            
            return false
        }
        else if placeHolderTextView.textColor == placeHolderTextView.placeholderColor && !text.isEmpty {
            // Else if the text view's placeholder is showing and the length of the replacement string is 
            // greater than 0, clear the text view and set its color to black to prepare for the user's entry
            textView.text = nil
            textView.textColor = UIColor.blackColor()
        }
        
        return true
    }
    
    func textViewDidChangeSelection(textView: UITextView) {
        if let placeHolderTextView = textView as? UIPlaceHolderTextView where self.view.window != nil {
            if placeHolderTextView.textColor == placeHolderTextView.placeholderColor {
                placeHolderTextView.selectedTextRange = placeHolderTextView.textRangeFromPosition(placeHolderTextView.beginningOfDocument, toPosition: placeHolderTextView.beginningOfDocument)
            }
        }
    }
}

UIPlaceHolderTextView.swift

class UIPlaceHolderTextView: UITextView {
    var placeholder = "Placeholder"
    var placeholderColor = UIColor.lightGrayColor()
}