LayoutConstraintProtocol

public protocol LayoutConstraintProtocol : RectBasedConstraint

Provides rect for constrain source space. Used for related constraints.

  • Flag, defines that constraint may be used for layout

    Declaration

    Swift

    var isActive: Bool { get }

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

    Declaration

    Swift

    var isIndependent: Bool { get }

  • LayoutElement object associated with this constraint

    Declaration

    Swift

    func layoutElement(is object: AnyObject) -> Bool

  • Return rectangle for constrain source rect

    Declaration

    Swift

    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

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

    Declaration

    Swift

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

    Parameters

    rect

    Initial rect
    coordinateSpace

    Destination coordinate space

    Return Value

    Converted rect

LayoutConstraint

  • active(_:) Extension method

    Returns constraint with possibility to change active state

    Declaration

    Swift

    func active(_ active: Bool) -> MutableLayoutConstraint

    Parameters

    active

    Initial active state

    Return Value

    Mutable layout constraint