Delegate Methods Never Called

Hi Apple Dev Community,
I've searched both here and google for similar questions, but none of the answers I found actually helped me...
So bacically, I am trying to add subviews (in my case UICollectionView) programmatically, but when I do so, the delegate methods never get called.
Here is the code:

import UIKit

class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {
    
    var collectionView: UICollectionView!

    override func viewDidLoad() {
        super.viewDidLoad()
        let myLayout = UICollectionViewFlowLayout()
        collectionView = UICollectionView(frame: self.view.frame, collectionViewLayout: myLayout)
        collectionView.backgroundColor = UIColor.red
        collectionView.delegate = self
        view.addSubview(collectionView)
        print("viewDidLoad")
    }
    
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int)
        -> Int {
            print("numberOfItemsInSection")
            return 50
    }
    
    // Initialize each cell
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath)
        -> UICollectionViewCell {
            print("cellForItemAt")
            let myCell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath
                as IndexPath)
            myCell.backgroundColor = UIColor.blue
            return myCell
    }
    
}

As you can see, viewDidLoad is successfully called, but the deledate methods are never called.
Please notice how I explicitly set

collectionView.delegate = self

However, even that is not enough to get the delegate methods to fire. Clearly, I must be missing something.
Does anyone know how I can fix this code?
Thanks in advance!
KC