Question

当我用范围声明集合视图时，它不会注册单元类

lazy var flowLayout:UICollectionViewFlowLayout = {

        let f = UICollectionViewFlowLayout()
        f.scrollDirection = .horizontal
        f.itemSize = CGSize(width: 100, height: 100)
        f.minimumInteritemSpacing = CGFloat.greatestFiniteMagnitude
        f.minimumLineSpacing = 5
        return f
    }()

    lazy var collection: UICollectionView = {

        let cv = UICollectionView(frame: CGRect.zero, collectionViewLayout: self.flowLayout)
        cv.translatesAutoresizingMaskIntoConstraints = false
        cv.showsVerticalScrollIndicator = false
        cv.showsHorizontalScrollIndicator = false
        cv.dataSource = self
        cv.delegate = self
        cv.register(PreviewFilmsPosterCell.self, forCellWithReuseIdentifier: cellId)
        cv.backgroundColor = .black
        return cv
    }()

会抛出此错误：

由于未捕获的异常而终止应用 'NSInternalInconsistencyException'，原因：'尝试注册一个 cell类，它不是UICollectionViewCell的子类

什么是正确的解决方案？

更新

但如果我这样声明它可以正常工作

 override func viewDidLoad() {

        collectionview = UICollectionView(frame: CGRect.zero, collectionViewLayout: flowLayout)
        collectionview.translatesAutoresizingMaskIntoConstraints = false
        collectionview.dataSource = self
        collectionview.delegate = self
        collectionview.register(PreviewFilmsPosterCell.self, forCellWithReuseIdentifier: cellId)
        collectionview.showsVerticalScrollIndicator = false
        collectionview.showsHorizontalScrollIndicator = false
        collectionview.backgroundColor = .black

}

我的 PreviewFilmsPosterCell类

class PreviewFilmsPosterCell: UICollectionViewCell {

    let profileImageButton: UIButton = {
        let button = UIButton()
        button.layer.cornerRadius = 50
        button.clipsToBounds = true
        button.setImage(UIImage(named: "profile_batman"), for: .normal)
        button.translatesAutoresizingMaskIntoConstraints = false
        return button
    }()

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

        addViews()
    }

    func addViews(){

        backgroundColor = UIColor.clear

        addSubview(profileImageButton)

        profileImageButton.heightAnchor.constraint(equalToConstant: 100).isActive = true
        profileImageButton.widthAnchor.constraint(equalToConstant: 100).isActive = true

    }

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

}

Answer 1

PreviewFilmsPosterCell NOT 是UICollectionViewCell的子类。

它必须继承要在UICollectionView

中使用的UICollectionViewCell

确保您的单元格正确继承

class PreviewFilmsPosterCell: UICollectionViewCell {...}

Answer 2

问题出在这里

cv.register(PreviewFilmsPosterCell.self, forCellWithReuseIdentifier: cellId)

此PreviewFilmsPosterCell类不是UICollectionViewCell的子类

一定是

class PreviewFilmsPosterCell:UICollectionViewCell

Answer 3

我在Date

中发现了我的错误

为什么UIColletionView与惰性var寄存器单元类抛出错误？

3 个答案: