集合视图不显示单元格 swift 5

Question

I'm creating a collection view with custom collection view cell. So, I've created the collection view in my storyboard view controller. The problem is that my cells are not shown at all, I've also tried using default cells, but they are not shown either, and of course, I've tried all the solutions I found. Thank you for helping in advance!

view controller class related parts

   override func viewDidLoad() {
        super.viewDidLoad()
        
        collectionView.delegate = self
        collectionView.dataSource = self
        
        title = set?.name
        
        
        
        collectionView!.register(WordCollectionViewCell.self, forCellWithReuseIdentifier: Identifies.WordCollectionViewCellIdentifier)
        
        
        let buttonItem  = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(addButtonPressed))
        
        
        navigationItem.rightBarButtonItem = buttonItem
        updateTranslations()
    }

hide: false console: true babel: false -->

extension SingleSetViewController : UICollectionViewDelegate, UICollectionViewDataSource  {
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        print(translations.count)
        return translations.count
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: Identifies.WordCollectionViewCellIdentifier, for: indexPath) as! WordCollectionViewCell
        
    
        cell.translation = translations[indexPath.row]
    
        return cell
    }
    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 1 
    }
}

collection view cell class

class WordCollectionViewCell: UICollectionViewCell {
    @IBOutlet weak var wordLabel: UILabel!
    
    private var showsWord = true
    
    
    private var _translation : Translation?
    var translation : Translation  {
        set {
            _translation = newValue
        }
        get {
            return _translation ?? Translation(word: "", translation: "")
        }
    }
    override func awakeFromNib() {
        super.awakeFromNib()
        
        let gestureRecognizer = UITapGestureRecognizer(target: self , action: #selector(flip))
        gestureRecognizer.numberOfTapsRequired = 1
        self.addGestureRecognizer(gestureRecognizer)
        
        wordLabel.text = _translation?.word
    }
    
    @objc private func flip(_ sender: UIGestureRecognizer){
        let options : UIView.AnimationOptions = [.transitionFlipFromRight]
        UIView.transition(with: self, duration: 0.5, options: options){
            if let translation = self._translation {
                    self.wordLabel.text = self.showsWord ? translation.translation : translation.word
                    self.showsWord = !self.showsWord
            }
        }
    }
    
    static func nib() -> UINib {
        return UINib(nibName: NibNames.WordCollectionViewCellNibName, bundle: nil)
    }
}

Answer 1

Your problem is

1- Here you set translation after awakeFromNib is called (called meanwhile dequeueReusableCell )

let cell = collectionView.dequeueReusableCell(withReuseIdentifier: Identifies.WordCollectionViewCellIdentifier, for: indexPath) as! WordCollectionViewCell
cell.translation = translations[indexPath.row]

so create a function commonly configure

func configure(_ translation:Translation) { 
    self.translation = translation
    wordLabel.text = _translation?.word
 }

and call it from cellForRowAt

cell.configure(translations[indexPath.row])

2- Xib cells need to be registered like this

collectionView!.register(WordCollectionViewCell.nib(), forCellWithReuseIdentifier: Identifies.WordCollectionViewCellIdentifier)