CollectionViewFlowLayout

open class CollectionViewFlowLayout : UICollectionViewFlowLayout

集合视图流式布局，支持纵向渲染和分页滚动效果

系统FlowLayout水平滚动时默认横向渲染，可通过本类开启纵向渲染，示例效果如下： [0 3 6 9 ] [0 1 2 3 ] [1 4 7 10] => [4 5 6 7 ] [2 5 8 11] [8 9 10 11]

CenteredCollectionView

Vertical

  • 是否启用元素纵向渲染，默认关闭，开启时需设置渲染总数itemRenderCount

    Declaration

    Swift

    open var itemRenderVertical: Bool

  • 纵向渲染列数，开启itemRenderVertical且大于0时生效

    Declaration

    Swift

    open var verticalColumnCount: Int

  • 纵向渲染行数，开启itemRenderVertical且大于0时生效

    Declaration

    Swift

    open var verticalRowCount: Int

  • 计算实际渲染总数，超出部分需渲染空数据，一般numberOfItems中调用

    Declaration

    Swift

    open func itemRenderCount(_ itemCount: Int) -> Int

  • 转换指定indexPath为纵向索引indexPath，一般无需调用

    Declaration

    Swift

    open func verticalIndexPath(_ indexPath: IndexPath) -> IndexPath

  • Undocumented

    Declaration

    Swift

    open override func prepare()

  • Undocumented

    Declaration

    Swift

    open override func layoutAttributesForItem(at indexPath: IndexPath) -> UICollectionViewLayoutAttributes?

  • Undocumented

    Declaration

    Swift

    open override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]?

Paging

  • 是否启用分页滚动，默认false。需设置decelerationRate为fast且关闭集合视图isPagingEnabled

    Declaration

    Swift

    open var isPagingEnabled: Bool

  • 是否启用居中分页，默认false

    Declaration

    Swift

    open var isPagingCenter: Bool

  • 获取当前页数，即居中cell的item，可能为nil

    Declaration

    Swift

    open var currentPage: Int? { get }

  • 获取每页宽度，必须设置itemSize

    Declaration

    Swift

    open var pageWidth: CGFloat { get }

  • 滚动到指定页数

    Declaration

    Swift

    open func scrollToPage(_ index: Int, animated: Bool = true)

  • Undocumented

    Declaration

    Swift

    override open func invalidateLayout(with context: UICollectionViewLayoutInvalidationContext)

  • Undocumented

    Declaration

    Swift

    override open func targetContentOffset(forProposedContentOffset proposedContentOffset: CGPoint, withScrollingVelocity velocity: CGPoint) -> CGPoint