ios - 我的 collectionView 中的页 footer 分出现问题

Question

我正在尝试在我的 collectionView 中实现自定义页 footer 分，但我想我遗漏了一些东西。我要存档我的代码。我希望你能帮助我。

谢谢!!!

自定义页 footer 分

class FooterCell: UICollectionViewCell {

let etiqueta: UILabel = {
    let label = UILabel()
    label.backgroundColor = .green
    label.translatesAutoresizingMaskIntoConstraints = false
    return label
}()

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

    addSubview(etiqueta)

    etiqueta.topAnchor.constraint(equalTo: self.topAnchor).isActive = true
    etiqueta.rightAnchor.constraint(equalTo: self.rightAnchor).isActive = true
    etiqueta.widthAnchor.constraint(equalToConstant: 50).isActive = true
    etiqueta.heightAnchor.constraint(equalToConstant: 50).isActive = true
}

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

Collection View 类

override func viewDidLoad() {
    super.viewDidLoad()


    collectionView?.register(FooterCell.self, forSupplementaryViewOfKind: UICollectionElementKindSectionFooter, withReuseIdentifier: "Footer") }

override func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {

    var reusableView = FooterCell()



    if kind == UICollectionElementKindSectionFooter {

        reusableView = collectionView.dequeueReusableSupplementaryView(ofKind: kind,  withReuseIdentifier: "Footer", for: indexPath) as! FooterCell

        reusableView.etiqueta.backgroundColor = .green
    }

    return reusableView

}

Answer 1

添加此方法-:

optional func collectionView(_ collectionView: UICollectionView, 
                  layout collectionViewLayout: UICollectionViewLayout, 
                  referenceSizeForFooterInSection section: Int) -> CGSize