ColumnsLayout

struct ColumnsLayout: Layout

A Layout that arranges its subviews in columns

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  • The spacing between the columns or nil to use the default

    Declaration

    Swift

    var columnSpacing: Double?
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  • The spacing between the subviews in the column row ornil to use the default

    Declaration

    Swift

    var rowSpacing: Double?
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  • The layout properties

    Declaration

    Swift

    static var layoutProperties: LayoutProperties
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  • A shared computation between sizeThatFits and placeSubviews.

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    Declaration

    Swift

    struct Cache
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  • Make a cache

    Declaration

    Swift

    func makeCache(subviews: Subviews) -> Cache

    Parameters

    subviews

    The subviews

    Return Value

    The cache

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  • Update the cache

    Declaration

    Swift

    func updateCache(_ cache: inout Cache, subviews: Subviews)

    Parameters

    cache

    The cache
    subviews

    The subviews
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  • Returns the size of the composite view, given a proposed size and the view’s subviews

    Note

    Protocol requirement

    Declaration

    Swift

    func sizeThatFits(
    proposal: ProposedViewSize,
    subviews: Subviews,
    cache: inout Cache
) -> CGSize

    Parameters

    proposal

    A size proposal for the container
    subviews

    A collection of proxies that represent the views that the container arranges
    cache

    Optional storage for calculated data

    Return Value

    A size that indicates how much space the container needs to arrange its subviews

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  • Assigns positions to each of the layout’s subviews

    Note

    Protocol requirement

    Declaration

    Swift

    func placeSubviews(
    in bounds: CGRect,
    proposal: ProposedViewSize,
    subviews: Subviews,
    cache: inout Cache
)

    Parameters

    bounds

    The region that the container view’s parent allocates to the container view, specified in the parent’s coordinate space
    proposal

    The size proposal from which the container generated the size that the parent used to create the bounds parameter
    subviews

    A collection of proxies that represent the views that the container arranges
    cache

    Optional storage for calculated data
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  • The structure of a column

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    Declaration

    Swift

    struct Column
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  • The structure of an element

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    Declaration

    Swift

    struct Element
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  • Arrange columns

    Declaration

    Swift

    private func arrangeColumns(
    proposal: ProposedViewSize,
    subviews: Subviews,
    cache: inout Cache
) -> [Column]

    Parameters

    proposal

    The proposed view size
    subviews

    The subviews
    cache

    The cache

    Return Value

    Thew columns

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  • Compute hash

    Declaration

    Swift

    private func computeHash(proposal: ProposedViewSize, sizes: [CGSize]) -> Int

    Parameters

    proposal

    The proposed view size
    sizes

    The array of sizes

    Return Value

    A hash as Int value

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  • Calculate the minimum size

    Declaration

    Swift

    private func minSize(subviews: Subviews) -> CGSize

    Parameters

    subviews

    The subviews

    Return Value

    The size

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  • Calculate the column spacing

    Declaration

    Swift

    private func columnSpacing(_ lhs: LayoutSubview, _ rhs: LayoutSubview) -> Double

    Parameters

    lhs

    The left layout subview
    rhs

    The right layout subview

    Return Value

    The spacing as Double

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  • Calculate the row spacing

    Declaration

    Swift

    private func rowSpacing(_ lhs: LayoutSubview, _ rhs: LayoutSubview) -> Double

    Parameters

    lhs

    The left layout subview
    rhs

    The right layout subview

    Return Value

    The spacing as Double

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