Text label missing on some collection view cells - ios

Question

The problem is that the text labels are missing on some cells and when I click the like button, the text label is supposed to update the label but instead, the whole collection view disappears. The text labels are fetching the numbers from firebase.
Here is the relevant code:
HomeController.swift:
class HomeController: UICollectionViewController, UICollectionViewDelegateFlowLayout, HomePostCellDelegate {
var hpc: HomePostCell!
let cellId = "cellId"
override func viewDidLoad() {
super.viewDidLoad()
collectionView?.register(HomePostCell.self, forCellWithReuseIdentifier: cellId)
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! HomePostCell
self.hpc = cell
cell.post = posts[indexPath.item]
cell.delegate = self
return cell
}
#objc func reload(likesLabelNotification: Notification) {
guard let likesLabel = likesLabelNotification.userInfo?["likesLabelInfo"] as? UILabel else { return }
guard let indexPath = collectionView?.indexPath(for: hpc) else { return }
let post = self.posts[indexPath.item]
guard let postId = post.id else { return }
let postUserId = post.user.uid
let numOfLikesRef = FIRDatabase.database().reference().child("likes").child(postId)
numOfLikesRef.observe(.value, with: { (snapshot: FIRDataSnapshot!) in
likesLabel.isHidden = false
let numOfChildrens = snapshot.childrenCount
likesLabel.text = "\(numOfChildrens)"
}, withCancel: { (error) in
print("failed to fetch num of posts: ",error)
})
self.posts[indexPath.item] = post
self.collectionView?.reloadData()
}
func didPressShareButton(for cell: HomePostCell) {
guard let indexPath = collectionView?.indexPath(for: cell) else { return }
let post = self.posts[indexPath.item]
guard let url = NSURL(string: post.videoUrl) else { return }
let activityViewController = UIActivityViewController(
activityItems: ["Check out this video I found on Vlogger: \(url)"],applicationActivities: nil)
present(activityViewController, animated: true, completion: nil)
}
func didLike(for cell: HomePostCell) {
guard let indexPath = collectionView?.indexPath(for: cell) else { return }
var post = self.posts[indexPath.item]
guard let postId = post.id else { return }
guard let uid = FIRAuth.auth()?.currentUser?.uid else { return }
let values = [uid : post.hasLiked == true ? 0 : 1]
FIRDatabase.database().reference().child("likes").child(postId).updateChildValues(values) { (err, _) in
if let err = err {
print("Failed to like post", err)
return
}
post.hasLiked = !post.hasLiked
self.posts[indexPath.item] = post
self.collectionView?.reloadData()
}
}
HomePostCell.swift:
protocol HomePostCellDelegate {
func didLike(for cell: HomePostCell)
}
class HomePostCell: UICollectionViewCell {
var delegate: HomePostCellDelegate?
lazy var likeButton: UIButton = {
let button = UIButton(type: .system)
button.setImage(#imageLiteral(resourceName: "heart_unselected").withRenderingMode(.alwaysOriginal), for: .normal)
button.addTarget(self, action: #selector(handleLike), for: .touchUpInside)
return button
}()
#objc func handleLike() {
delegate?.didLike(for: self)
}
lazy var likesLabel: UILabel = {
let label = UILabel()
label.font = UIFont(name: "AvenirNext-Regular", size: 20)
label.textColor = UIColor.black
label.isHidden = true
let userInfo = ["likesLabelInfo": label]
NotificationCenter.default.post(name: NSNotification.Name(rawValue: "refresh"), object: nil, userInfo: userInfo)
return label
}()
override init(frame: CGRect) {
super.init(frame: frame)
}
static let homePostCellNotificationName = NSNotification.Name(rawValue: "homePostCellRaw")
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
Please comment below if you have any questions!
Thanks in advance!