Listen for changes to NSTextView with NSTextViewDelegate & textViewDidChange not working

Question

I want a function to fire every time the user makes a change to my NSTextView. I got this to work in an iOS app and am now trying to make it work in an OS X app. I created an outlet for my NSTextView and wrote the following Swift code:

import Cocoa

class ViewController: NSViewController, NSTextViewDelegate {

    @IBOutlet var textViewOutlet: NSTextView!

    func textViewDidChange(textView: NSTextView) {
        print("Text view changed!")
    }
}

I don't get any errors but my statement doesn't print.

Answer 1

It should be textDidChange(notification:). Try like this:

func textDidChange(_ notification: Notification) {
    guard let textView = notification.object as? NSTextView else { return }
    print(textView.string)
}

Answer 2

This should be why there is no delegate assignment.

TextViewOutlet.delegate = self;

And the method actually looks like this. Notice the parameters

func textDidChange(_ notification: Notification) {

}