Xcode Swift UICollectionView: cellForItemAt IndexPath not called but numberOfItemsInSection does - swift

Question

I am currently programming an app with UICollectionView only when I start the app the CollectionView is not displayed. In my app I do not use the StoryBoard but only the ViewController. That's why I inherit from UICollectionViewController in my app. But when I start the app, the UICollectionView is simply not displayed. Through print commands I found out that the numberOfItemsInSection method is called, but the cellForItemAt indexPath is not. I also know that this will probably be a double question, but I still haven't found a solution for 2 hours. CollectionView.delegateand collectionView.dataSource are both set to = self and there are actually no problems with the constrains because I can turn the background of the UICollectionView to black, for example, and everything is displayed correctly there.
I hope someone can help me.
Best regards
// MARK: - Collectionview
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
print("Item wurde erstellt")
return messages.count
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! ChatMessageCollectionViewCell
let message = messages[indexPath.item]
cell.textView.text = message.message
setUpCell(cell, message)
cell.bubbleViewWidthAnchor?.constant = estimateFrameForText(text: message.message!).width + 32
print("Celle wird erstellt")
return cell
}

Answer 1

I think you have missed the height and width for the cell. You should also check the message array count, perhaps it is zero.
extension YouClass: UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return messages.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! ChatMessageCollectionViewCell
let message = messages[indexPath.item]
cell.textView.text = message.message
setUpCell(cell, message)
cell.bubbleViewWidthAnchor?.constant = estimateFrameForText(text: message.message!).width + 32
print("Celle wird erstellt")
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: collBanner.frame.width, height: 140)
}
}