Unable to Dequeue Registered CollectionViewCells

Question

Searched here and there but I couldn't find anything that I haven't already tried to fix my issue, so going to ask it again.

I am trying to use a collection view with custom cells.

The main collection view is in the Main View Controller.

I'm using a generic cell named GenericHomeCollectionViewCell, then customize another collection view that it has. This cell doesn't have any issue with registering and dequeuing. (It might sound weird but I already have an application with this usage and it works without any problem, so I wanted to use the same method again.)

The crash happens when I try to register and dequeue cells inside that generic cell.

I have 4 different custom cells for use which are registered in awakeFromNib().

GenericHomeCollectionViewCell.swift

override func awakeFromNib() {
    super.awakeFromNib()
    
    newsCollectionView.register(UINib(nibName: "HeadlineNewsCollectionViewCell", bundle: nil), forCellWithReuseIdentifier: "HeadlineNewsCollectionViewCell")
    newsCollectionView.register(UINib(nibName: "HomeAuthorCollectionViewCell", bundle: nil), forCellWithReuseIdentifier: "HomeAuthorCollectionViewCell")
    newsCollectionView.register(UINib(nibName: "NewsListCollectionViewCell", bundle: nil), forCellWithReuseIdentifier: "NewsListCollectionViewCell")
    newsCollectionView.register(UINib(nibName: "HomeDetailedNewCollectionViewCell", bundle: nil), forCellWithReuseIdentifier: "HomeDetailedNewCollectionViewCell")
    
    newsCollectionView.delegate = self
    newsCollectionView.dataSource = self
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    if sectionType == .swipe {
        let cell : HeadlineNewsCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "HeadlineNewsCollectionViewCell", for: indexPath) as! HeadlineNewsCollectionViewCell
        cell.prepareCell(news: newsList[indexPath.row])
        return cell
     } else if sectionType == .homeAuthor {
        let cell : HomeAuthorCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "HomeAuthorCollectionViewCell", for: indexPath) as! HomeAuthorCollectionViewCell
        cell.prepareCell(news: newsList[indexPath.row])
        return cell
    } else {
        let cell : HeadlineNewsCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "HeadlineNewsCollectionViewCell", for: indexPath) as! HeadlineNewsCollectionViewCell
        cell.prepareCell(news: newsList[indexPath.row])
        return cell
     }
}

When I launch the application, I get crash with error:

*** Assertion failure in -[UICollectionView _dequeueReusableViewOfKind:withIdentifier:forIndexPath:viewCategory:], UICollectionView.m:6502

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'could not dequeue a view of kind: UICollectionElementKindCell with identifier HeadlineNewsCollectionViewCell - must register a nib or a class for the identifier or connect a prototype cell in a storyboard'

I tried to give a reuse identifier name from the storyboard editor's but there is no difference.

Screen Shot 2021-07-28 at 15.05.33.png

iOS
Swift

1.5k

Posted by

oguzhanvarsak

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Answer 1

Not sure that's the issue, but I usually register in viewDidLoad.

Add some test here:

override func awakeFromNib() {
    super.awakeFromNib()
    print(#function)

And tell if you get the log.

Posted by

Claude31

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Answer 2

‘awakeFromNib()’ is the equal of ‘viewDidLoad()’ for custom cells (aka XIBs) and I register the cells in where it should be. I already tried debugging and see if the method being called, it actually does run the register steps, but somehow the cells are not registered in the end.

Posted by

oguzhanvarsak

Is there a single collectionView (newsCollectionView) in your class ? Could you show the code for HeadlineNewsCollectionViewCell ? Interesting discussion here: https://stackoverflow.com/questions/17729582/uicollectionview-in-a-uicollectionviewcell

—
Claude31
@Claude31 I have found the problem. I have 2 more CollectionViews in GenericHomeCollectionViewCell; one for numbers under the news and another one for the right menu. When I disable those 2 collection views, the application launched without any problems, and my newsCollectionView populated with the data. I guess the cells were trying to dequeue for those collectionViews, not my newsCollectionView. Any idea how can I work around this?

—
oguzhanvarsak
What are the identifiers of those CollectionViews ? Check carefully in all your project for those identifiers, maybe you have some mess up somewhere.

—
Claude31

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Unable to Dequeue Registered CollectionViewCells

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