MutableLayoutConstraint

public class MutableLayoutConstraint : LayoutConstraintProtocol

Layout constraint that creates possibility to change active state.

  • Flag, defines that constraint may be used for layout

    Declaration

    Swift

    public var isActive: Bool { get set }

  • Designed initializer

    Declaration

    Swift

    public init(base: LayoutConstraintProtocol, isActive: Bool)

    Parameters

    base

    Constraint for mutating
    isActive

    Initial state

  • Main function for constrain source space by other rect

    Declaration

    Swift

    public func formConstrain(sourceRect: inout CGRect, by rect: CGRect)

    Parameters

    sourceRect

    Source space
    rect

    Rect for constrain

  • Converts rect from constraint coordinate space to destination coordinate space if needed.

    Declaration

    Swift

    public func convert(rectIfNeeded rect: CGRect, to coordinateSpace: LayoutElement) -> CGRect

    Parameters

    rect

    Initial rect
    coordinateSpace

    Destination coordinate space

    Return Value

    Converted rect

  • Return rectangle for constrain source rect

    Declaration

    Swift

    public func constrainRect(for currentSpace: CGRect, in coordinateSpace: LayoutElement) -> CGRect

    Parameters

    currentSpace

    Source rect in current state
    coordinateSpace

    Working coordinate space

    Return Value

    Rect for constrain

  • LayoutElement object associated with this constraint

    Declaration

    Swift

    public func layoutElement(is object: AnyObject) -> Bool

  • Flag that constraint not required other calculations. It`s true for size-based constraints.

    Declaration

    Swift

    public var isIndependent: Bool { get }