observing contentSize (CGSize) with KVO in swift

With Swift 4, you can cast the result of the change dictionary for the key NSKeyValueChangeKey.newKey as being of type CGSize:

if let size = change?[NSKeyValueChangeKey.newKey] as? CGSize {
    /* ... */
}

---

The following UIViewController implementation shows how to set a KVO stack in order to observe the changes of the contentSize property of any UIScrollView subclass (e.g UITextView):

import UIKit

private var myContext = 0

class ViewController: UIViewController {

    @IBOutlet weak var textView: UITextView!

    /* ... */

    override func viewDidLoad() {
        super.viewDidLoad()

        textView.addObserver(self, forKeyPath: #keyPath(UITextView.contentSize), options: [NSKeyValueObservingOptions.new], context: &myContext)
    }

    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        if context == &myContext,
            keyPath == #keyPath(UITextView.contentSize),
            let contentSize = change?[NSKeyValueChangeKey.newKey] as? CGSize {
            print("contentSize:", contentSize)
        }
    }

    deinit {
        textView.removeObserver(self, forKeyPath: #keyPath(UITextView.contentSize))
    }

}

---

Note that with Swift 4, as an alternative to addObserver(_:, forKeyPath:, options:, context:) and observeValue(forKeyPath:, of:, change:, context:), you can use observe(_:, options:, changeHandler:) in order to track your UIScrollView subclass contentSize property changes:

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var textView: UITextView!
    var observer: NSKeyValueObservation?

    /* ... */

    override func viewDidLoad() {
        super.viewDidLoad()

        let handler = { (textView: UITextView, change: NSKeyValueObservedChange<CGSize>) in
            if let contentSize = change.newValue {
                print("contentSize:", contentSize)
            }
        }
        observer = textView.observe(\UITextView.contentSize, options: [NSKeyValueObservingOptions.new], changeHandler: handler)
    }

}

Are you on iOS? Because I am, I did the same thing and arrived at the same question; why NSSize? Maybe that's just the xcode terminal playing a trick on us.

Anyway, you can cast it to an NSValue then you will be able to use CGSizeValue:

if let zeChange = change as? [NSString: NSValue] {
    let oldSize = zeChange[NSKeyValueChangeOldKey]?.CGSizeValue()
    let newSize = zeChange[NSKeyValueChangeNewKey]?.CGSizeValue()
}