我有一个包含两个部分的 Collection View ，每个部分都有一个项目。部分中的单元格包含 Collection View ，我需要使高度单元格适合内容 Collection View 。

我的第一个部分的高度固定为 120，因为它是水平的 collectionview 并且高度没有改变。但是对于第二部分，可以更改元素数量，我需要显示所有项目(collectionview 将 scrollEnabled 设置为 false，将 scrolldirecton 设置为垂直)。

我的问题是我需要显示一个带有两个滚动方向依赖部分的 Collection View ，并显示垂直 Collection View 的所有项目。

Khi tôi thực thi collectionview.collectionViewLayout.collectionViewContentSize.height 时，我的高度很好，但我不知道如何将此高度传递给父 View Controller 。我搜索了一个动态解决方案来解决这个问题。

class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {

    // MARK: - UICollectionViewDataSource

    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return presenter.numberOfSections // == 2
    }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return presenter.numberOfItemsInSection // == 1
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueCell(InlineDisplayCollectionViewCell.self, for: indexPath)
        configureCell(cell, at: indexPath)

        return cell
    }

    // MARK: - UICollectionViewDelegateFlowLayout

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        let type = presenter.typeAtIndexPath(indexPath)
        switch type {
        case .city:
            return CGSize(width: collectionView.frame.width, height: 120)
        case .suggestion:
            return CGSize(width: collectionView.frame.width, height: 820)
        mặc định:
            return CGSize.zero
        }
    }


}


class InlineDisplayCollectionViewCell: UICollectionViewCell, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {

    @IBOutlet weak var collectionView: UICollectionView!

    var itemType: ItemModelCollectionType! = .city {
        didSet {
            updateCell()
        }
    }
    var cities: [City]? {
        didSet {
            collectionView.reloadData()
        }
    }
    var suggestions: [Suggestion]? {
        didSet {
            collectionView.reloadData()
        }
    }

    override func awakeFromNib() {
        super.awakeFromNib()

        configureView()
    }

    // MARK: - UICollectionViewDataSource

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return itemType == .city ? cities?.count ?? 0 : suggestions?.count ?? 0
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell: UICollectionViewCell
        if itemType == .city {
            let cityCell = collectionView.dequeueCell(CityCollectionViewCell.self, for: indexPath)
            configure(cell: cityCell, at: indexPath)
            cell = cityCell
        } khác {
            let suggestionCell = collectionView.dequeueCell(SquareCollectionViewCell.self, for: indexPath)
            configure(cell: suggestionCell, at: indexPath)
            cell = suggestionCell
        }
        return cell
    }

    // MARK: - UICollectionViewDelegateFlowLayout

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
        return itemType == .city ? 10 : 10
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
        return itemType == .city ? 0 : 10
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        let size: CGSize
        if itemType == .city {
            size = CGSize(width: 100, height: 120)
        } khác {
            let width = (collectionView.frame.width - (collectionView.contentInset.left + collectionView.contentInset.right) - 10) * 0.5
            let height = width
            size = CGSize(width: width, height: height)
        }

        kích thước trả lại
    }

    // MARK: - Private functions

    private func configureView() {
        collectionView.delegate = self
        collectionView.dataSource = self
        collectionView.contentInset = UIEdgeInsets(top: 0, left: 20, bottom: 0, right: 20)
        collectionView.registerNib(CityCollectionViewCell.self, bundle: nil)
        collectionView.registerNib(SquareCollectionViewCell.self, bundle: nil)
    }

    private func updateCell() {
        if let flowLayout = collectionView.collectionViewLayout as? UICollectionViewFlowLayout {
            flowLayout.scrollDirection = itemType == .city ? .horizontal : .vertical
        }
        collectionView.isScrollEnabled = itemType == .city
    }

    private func configure(cell: CityCollectionViewCell, at indexPath: IndexPath) {
        guard let city = cities?[indexPath.row] else { return }
        cell.configure(with: city)
    }

    private func configure(cell: SquareCollectionViewCell, at indexPath: IndexPath) {
        guard let suggestion = suggestions?[indexPath.row] else { return }
        cell.configure(with: suggestion)
    }

}

câu trả lời hay nhất

你不能那样做。 CollectionView 单元格出列并动态重用。最好的方法是在同一个 CollectionView 中使用不同类型的单元格。

请查看我就此主题发布的问题:Get the sum of all collectionViewCells' heights inside a CollectionViewVà Multiple Cells for Comments and Reply in a CollectionView

关于swift - collectionview 单元格中的 Collectionview 适合内容，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/54272306/