创建UICollectionView类并添加到童话板中

Question

子类UICollectionView并尝试在Storyboard VC中设置。

class CategoryCollectionView: UICollectionView, UICollectionViewDelegate, ReusableView, NibLoadableView {
  
  /// Local
  var categoryDataSource: CategoryDataSource!
  
  typealias CategoryDataSource = UICollectionViewDiffableDataSource<Section, CommunityType>
  typealias CategorySnapshot = NSDiffableDataSourceSnapshot<Section, CommunityType>
  
  override init(frame: CGRect, collectionViewLayout layout: UICollectionViewLayout) {
    super.init(frame: frame, collectionViewLayout: collectionViewLayout)
    configure()
  }
  
  required init?(coder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
  }
  
  fileprivate func configure() {
    self.register(CardTypeCell.self)
    self.collectionViewLayout = createLayout()
    self.delegate = self
  }
  
  private func createLayout() -> UICollectionViewLayout {
    
    let padding: CGFloat = 5
    let flowLayout = UICollectionViewFlowLayout()
    flowLayout.sectionInset = UIEdgeInsets(top: padding, left: padding, bottom: padding, right: padding)
    flowLayout.itemSize = CGSize(width: 152, height: 70)
    flowLayout.scrollDirection = .horizontal
    flowLayout.sectionHeadersPinToVisibleBounds = true
    return flowLayout
  }
}

init方法中的一个错误：'self‘在“super.init”调用之前用于属性访问'collectionViewLayout’

Answer 1

不是100%肯定，因为我们遗漏了很多您的代码(Section、CommunityType等)，但是.

这一行：

super.init(frame: frame, collectionViewLayout: collectionViewLayout)

应：

super.init(frame: frame, collectionViewLayout: layout)