当我应该有一堆可重复使用的单元格时，为什么我的集合视图是空的？

Question

我有以下代码：

class FinalImageViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {
    
    var not: [UIImage?] = [#imageLiteral(resourceName: "silly5"), #imageLiteral(resourceName: "special16")]
    
    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 3
    }
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return not.count
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CVImageView", for: indexPath) as! CVCell
        cell.cellImageView.image = not[indexPath.row]
        return cell
    }
    
    
    @IBOutlet weak var collectionView: UICollectionView!
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        print(ImagesOnClick)
        collectionView.delegate = self
        collectionView.dataSource = self
        collectionView.register(CVCell.self, forCellWithReuseIdentifier: "CVImageView")
    }
    
}

还有我的牢房：

class CVCell: UICollectionViewCell {
    @IBOutlet weak var cellImageView: UIImageView!
    
}

然后在我的故事板中，我将 imageView 标记设置为 3，将单元格标识符设置为 CVImageView，但是当我运行项目时，集合视图全是白色，并且没有显示任何项目。顺便说一句，如果您想知道 ImagesOnClick 是什么，它只是用户选择的图像的数组。

Answer 1

你可以在故事板中找到你的班级名称，它应该是这样的

class FinalImageViewController: UIViewController,UICollectionViewDelegate, UICollectionViewDataSource {

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return ImagesOnClick.count
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withIdentifier: "CVImageView", for: indexPath) as! CVImageCell //replace CVImageCell with your cell class name
    cell.imageView.image = ImagesOnClick[indexPath.row] //replace imageView with your image view name with tag=3
    return cell
}


@IBOutlet weak var collectionView: UICollectionView!


override func viewDidLoad() {
    super.viewDidLoad()
    print(ImagesOnClick)
    collectionView.register(CVImageCell.self, forCellWithReuseIdentifier: "CVImageView") //replace CVImageCell with your cell class name
    collectionView.delegate = self
    collectionView.dataSource = self
}

}