Recommended UIContentConfiguration / UIContentView pattern for table and collection cells

[astralchen]

Question

Related to #12, but this question is about UIKit’s configuration-based cell architecture rather than applying @QuickLayout directly to each cell subclass.

QuickLayout currently special-cases UITableViewCell and UICollectionViewCell so that a cell’s QuickLayout body is hosted in cell.contentView. With UIContentConfiguration, UIKit creates and manages a custom UIContentView. I could not find an example of this pattern and am unsure which object should own QuickLayout layout and sizing.

When a generic UITableViewCell or UICollectionViewCell receives a custom UIContentView, is applying @QuickLayout to that content view the supported approach?

Minimal example

struct CardConfiguration: UIContentConfiguration {
  let title: String

  @MainActor
  func makeContentView() -> any UIView & UIContentView {
    CardContentView(configuration: self)
  }

  func updated(for state: any UIConfigurationState) -> Self {
    self
  }
}

@QuickLayout
final class CardContentView: UIView, UIContentView {
  private let titleLabel = UILabel()
  private var model: CardConfiguration

  var configuration: any UIContentConfiguration {
    get { model }
    set {
      guard let configuration = newValue as? CardConfiguration else { return }
      model = configuration
      titleLabel.text = configuration.title
      setNeedsLayout()
    }
  }

  init(configuration: CardConfiguration) {
    model = configuration
    super.init(frame: .zero)
    self.configuration = configuration
  }

  @available(*, unavailable)
  required init?(coder: NSCoder) {
    fatalError()
  }

  var body: Layout {
    HStack {
      titleLabel
    }
    .padding(.horizontal, 16)
    .padding(.vertical, 8)
  }
}

// The same configuration is assigned to either cell type:
cell.contentConfiguration = CardConfiguration(title: title)

Could you clarify:

• Should @QuickLayout live only on the custom UIContentView, leaving the cell generic, or should the cell also adopt @QuickLayout?
• For self-sizing table rows and collection items with estimated dimensions, is the generated sizeThatFits(_:) on the content view sufficient, or is cell-level sizing customization still required as discussed in Avoid overriding preferredLayoutAttributesFitting in every auto-sizing UICollectionViewCell #12?
• When applying a configuration that changes the content size, is setNeedsLayout() sufficient? Should invalidateIntrinsicContentSize(), a cell-level invalidation call, or a QuickLayout-specific helper be used?
• On iOS 16+, should supports(_:) be implemented so UIKit can reuse the existing content view?
• Are there any differences in the recommended pattern for UITableViewCell and UICollectionViewCell?

An official example covering both cell types would be very helpful. Thanks!

Environment

• QuickLayout: main at 38020f2
• Swift 6
• iOS 15+