Trouble added cell to UICollectionView - swift

Question

Trying to add a cell to my ViewController, and I'm having trouble. I'm wondering if I have all my delegates. Currently, I can change the color of the collection view's background, but can't add any cells.
I'm using an array of text from my Listing() object to drive the collection view cells. On viewDidLoad the length is 4. I envisioned using this count for the numberofItemsInSection, however, if I put the print statement there it is never printed. Which makes me think the wrong delegate is called and the method is never hit. Correct?
import UIKit
class ListingDetailViewController: UIViewController,
UICollectionViewDelegateFlowLayout {
var listing = Listing()
// #IBOutlet var image: UIImageView!
#IBOutlet var post: UITextView!
#IBOutlet var price: UILabel!
#IBOutlet var amenitiesCollection: UICollectionView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
navigationItem.title = listing.title
self.amenitiesCollection!.backgroundColor = UIColor.gray
print(listing.amenities.count)//printed 4
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int{
print(listing.amenities.count)
return listing.amenities.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let identifier = "UICollectionViewCell"
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: identifier, for: indexPath)
return cell
}
}

Answer 1

Make sure you have linked the CollectionView delegate and datasource to your view controller.
In viewDidLoad() add:
self.amenitiesCollection.delegate = self
self.amenitiesCollection.dataSource = self
==================================
EDIT:
If you have already linked the delegate and dataSource, try reloading the collection view in viewDidAppear(_:)
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
self.amenitiesCollection.reloadData()
}