CollectionViewCell 未出現在 collectionView 中 (CollectionViewCell not appearing in collectionView)

問題描述

CollectionViewCell 未出現在 collectionView 中 (CollectionViewCell not appearing in collectionView)

我有一個問題，自定義 UICollectionViewCell 不會出現在 UICollectionView 中。有人知道我錯過了什麼嗎？我提前感謝它。

下面是我的 UICollectionViewController:

private let reuseIdentifier = "FeedCell"

class FeedViewController: UICollectionViewController, UICollectionViewDelegateFlowLayout {

    // MARK: Properties
    override func viewDidLoad() {
        super.viewDidLoad()

        // Register cell classes
        self.collectionView!.register(FeedCell.self, forCellWithReuseIdentifier: reuseIdentifier)
    }

    //MARK: ‑ UICollectionViewFlowLayout

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) ‑> CGSize {
        let width = view.frame.width

        return CGSize(width: width, height: width)
    }


    //MARK: ‑ UICollectionViewDataSource

    override func numberOfSections(in collectionView: UICollectionView) ‑> Int {
        return 1
    }

    override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) ‑> Int {
        return 5
    }

    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) ‑> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) as! FeedCell
        print("CELL")
        cell.backgroundColor = .black

        return cell
    }


//FEED CELL 

class FeedCell: UICollectionViewCell {

    //MARK: ‑ Properties

    let profileImageView: CustomeImageView = {
        let imageView = CustomeImageView()
        imageView.contentMode = .scaleAspectFill
        imageView.clipsToBounds = true
        imageView.backgroundColor = .lightGray

        return imageView
    }()

    override init(frame: CGRect) {
        super.init(frame: frame)

        self.backgroundColor = .red
        print("feedcell1")
        addSubview(profileImageView)
        profileImageView.anchor(top: topAnchor, bottom: nil, left: leftAnchor, right: nil, paddingTop: 8, paddingBottom: 0, paddingLeft: 8, paddingRight: 0, width: 40, height: 40)
        profileImageView.layer.cornerRadius = 40/2
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

謝謝:)

參考解法

方法 1:

The issue was I had previously instantiated FeedViewController with

FeedViewController(collectionViewLayout: UICollectionViewLayout())

instead of `FeedViewController(collectionViewLayout:

UICollectionViewFlowLayout()))` since FeedViewController has

UICollectionViewDelegateFlowLayout protocol.

(by Nouru Muneza、Nouru Muneza)

參考文件

1. CollectionViewCell not appearing in collectionView (CC BY‑SA 2.5/3.0/4.0)