FittingGridFlowLayout

public class FittingGridFlowLayout: UICollectionViewFlowLayout

UICollectionViewFlowLayout subclass that shows items as grid that fit horizontally to a fixed margin rather than a fixed size. The size is determined by the itemTargetWidth, singleColumnRatio and multiColumnRatio. The target width may not be realized, but is used to determined the number of columns in the layout.

  • The actual number of items filling the width of the collection view given the itemTargetWidth, line spacing, item spacing and width of the collection view.

    Declaration

    Swift

    private(set) public var columnCount:Int = 0

  • The target width of all items in the grid. Default is 380. If the actual number of items that will fit given the item and line spacing is fractional, the number of items wide is the rounded value. The actual size of the items with therefore vary from this value in most cases. The height is determined by the singleColumnRatio and multiColumnRatio properties. Default is 380.0.

    Declaration

    Swift

    public var itemTargetWidth:CGFloat = 380.0

  • The ratio of the items if there is only a single column. Default is 0.5625.

    Declaration

    Swift

    public var singleColumnRatio:CGFloat = 0.5625

  • The ratio of the items if there are multiple columns. Default is 0.75.

    Declaration

    Swift

    public var multiColumnRatio:CGFloat = 0.75

  • Returns the number of items in a row based on the ratio properties given the contentWidth. In prepareLayout this method is called with the collectionView’s bounds’s width.

    Declaration

    Swift

    public func columnCountForWidth(contentWidth:CGFloat) -> Int

  • Returns the item size of items based on the ratio properties given the contentWidth. In prepareLayout this method is called with the collectionView’s bounds’s width.

    Declaration

    Swift

    public func itemSizeForWidth(contentWidth:CGFloat) -> CGSize

  • Calculates the column count for the size of the current collectionView, setting the itemSize based on itemSizeForWidth(_:).

    Declaration

    Swift

    override public func prepareLayout()

  • Invalidates the layout based on whether or not the width of newBounds differs from that of the current collectionView.

    Declaration

    Swift

    override public func shouldInvalidateLayoutForBoundsChange(newBounds: CGRect) -> Bool