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Convert protocol hierarchy to class hierarchy 

This has no value unto itself, but is necessary for adding default
arguments to the ConstraintDescriptionRelatable methods, which we'll
need to instrument in source locations.
This commit is contained in:
Akiva Leffert 2015-10-12 01:53:46 -04:00
parent cd49354220
commit 104ce8895c
2 changed files with 193 additions and 142 deletions
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331
Source/ConstraintDescription.swift
View File

@ -106,138 +106,231 @@ extension View : RelationTarget {
} }
} }
extension ConstraintItem : RelationTarget {
public var constraintItem : ConstraintItem {
return self
}
}
/** /**
Used to expose the final API of a `ConstraintDescription` which allows getting a constraint from it Used to expose the final API of a `ConstraintDescription` which allows getting a constraint from it
*/ */
public protocol ConstraintDescriptionFinalizable: class { public class ConstraintDescriptionFinalizable {
var constraint: Constraint { get } private let backing : ConstraintDescription
internal init(_ backing : ConstraintDescription) {
self.backing = backing
}
public var constraint: Constraint {
return backing.constraint
}
} }
/** /**
Used to expose priority APIs Used to expose priority APIs
*/ */
public protocol ConstraintDescriptionPriortizable: ConstraintDescriptionFinalizable { public class ConstraintDescriptionPriortizable: ConstraintDescriptionFinalizable {
func priority(priority: FloatConvertible) -> ConstraintDescriptionFinalizable public func priority(priority: FloatConvertible) -> ConstraintDescriptionFinalizable {
func priorityRequired() -> ConstraintDescriptionFinalizable return ConstraintDescriptionFinalizable(self.backing.priority(priority))
func priorityHigh() -> ConstraintDescriptionFinalizable }
func priorityMedium() -> ConstraintDescriptionFinalizable
func priorityLow() -> ConstraintDescriptionFinalizable public func priorityRequired() -> ConstraintDescriptionFinalizable {
return ConstraintDescriptionFinalizable(self.backing.priorityRequired())
}
public func priorityHigh() -> ConstraintDescriptionFinalizable {
return ConstraintDescriptionFinalizable(self.backing.priorityHigh())
}
public func priorityMedium() -> ConstraintDescriptionFinalizable {
return ConstraintDescriptionFinalizable(self.backing.priorityMedium())
}
public func priorityLow() -> ConstraintDescriptionFinalizable {
return ConstraintDescriptionFinalizable(self.backing.priorityLow())
}
} }
/** /**
Used to expose multiplier & constant APIs Used to expose multiplier & constant APIs
*/ */
public protocol ConstraintDescriptionEditable: ConstraintDescriptionPriortizable { public class ConstraintDescriptionEditable: ConstraintDescriptionPriortizable {
func multipliedBy(amount: FloatConvertible) -> ConstraintDescriptionEditable public func multipliedBy(amount: FloatConvertible) -> ConstraintDescriptionEditable {
return ConstraintDescriptionEditable(self.backing.multipliedBy(amount))
}
func dividedBy(amount: FloatConvertible) -> ConstraintDescriptionEditable public func dividedBy(amount: FloatConvertible) -> ConstraintDescriptionEditable {
return self.multipliedBy(1 / amount.floatValue)
func offset(amount: FloatConvertible) -> ConstraintDescriptionEditable }
func offset(amount: CGPoint) -> ConstraintDescriptionEditable
func offset(amount: CGSize) -> ConstraintDescriptionEditable
func offset(amount: EdgeInsets) -> ConstraintDescriptionEditable
func inset(amount: FloatConvertible) -> ConstraintDescriptionEditable public func offset(amount : FloatConvertible) -> ConstraintDescriptionEditable {
func inset(amount: EdgeInsets) -> ConstraintDescriptionEditable return ConstraintDescriptionEditable(self.backing.offset(amount))
}
public func offset(amount: CGPoint) -> ConstraintDescriptionEditable {
return ConstraintDescriptionEditable(self.backing.offset(amount))
}
public func offset(amount: CGSize) -> ConstraintDescriptionEditable {
return ConstraintDescriptionEditable(self.backing.offset(amount))
}
public func offset(amount: EdgeInsets) -> ConstraintDescriptionEditable {
return ConstraintDescriptionEditable(self.backing.offset(amount))
}
public func inset(amount: FloatConvertible) -> ConstraintDescriptionEditable {
return ConstraintDescriptionEditable(self.backing.inset(amount))
}
public func inset(amount: EdgeInsets) -> ConstraintDescriptionEditable {
return ConstraintDescriptionEditable(self.backing.inset(amount))
}
} }
/** /**
Used to expose relation APIs Used to expose relation APIs
*/ */
public protocol ConstraintDescriptionRelatable: class { public class ConstraintDescriptionRelatable {
private let backing : ConstraintDescription
func equalTo(other: ConstraintItem) -> ConstraintDescriptionEditable init(_ backing : ConstraintDescription) {
func equalTo(other: RelationTarget) -> ConstraintDescriptionEditable self.backing = backing
@available(iOS 7.0, *) }
func equalTo(other: LayoutSupport) -> ConstraintDescriptionEditable
func lessThanOrEqualTo(other: ConstraintItem) -> ConstraintDescriptionEditable
func lessThanOrEqualTo(other: RelationTarget) -> ConstraintDescriptionEditable public func equalTo(other: RelationTarget) -> ConstraintDescriptionEditable {
@available(iOS 7.0, *) return ConstraintDescriptionEditable(self.backing.constrainTo(other, relation : .Equal))
func lessThanOrEqualTo(other: LayoutSupport) -> ConstraintDescriptionEditable }
public func equalTo(other: LayoutSupport) -> ConstraintDescriptionEditable {
return ConstraintDescriptionEditable(self.backing.constrainTo(other, relation : .Equal))
}
func greaterThanOrEqualTo(other: ConstraintItem) -> ConstraintDescriptionEditable public func lessThanOrEqualTo(other: RelationTarget) -> ConstraintDescriptionEditable {
func greaterThanOrEqualTo(other: RelationTarget) -> ConstraintDescriptionEditable return ConstraintDescriptionEditable(self.backing.constrainTo(other, relation : .LessThanOrEqualTo))
@available(iOS 7.0, *) }
func greaterThanOrEqualTo(other: LayoutSupport) -> ConstraintDescriptionEditable public func lessThanOrEqualTo(other: LayoutSupport) -> ConstraintDescriptionEditable {
return ConstraintDescriptionEditable(self.backing.constrainTo(other, relation : .LessThanOrEqualTo))
}
public func greaterThanOrEqualTo(other: RelationTarget) -> ConstraintDescriptionEditable {
return ConstraintDescriptionEditable(self.backing.constrainTo(other, relation : .GreaterThanOrEqualTo))
}
public func greaterThanOrEqualTo(other: LayoutSupport) -> ConstraintDescriptionEditable {
return ConstraintDescriptionEditable(self.backing.constrainTo(other, relation : .GreaterThanOrEqualTo))
}
} }
/** /**
Used to expose chaining APIs Used to expose chaining APIs
*/ */
public protocol ConstraintDescriptionExtendable: ConstraintDescriptionRelatable { public class ConstraintDescriptionExtendable: ConstraintDescriptionRelatable {
var left: ConstraintDescriptionExtendable { get } public var left: ConstraintDescriptionExtendable {
var top: ConstraintDescriptionExtendable { get } return ConstraintDescriptionExtendable(self.backing.left)
var bottom: ConstraintDescriptionExtendable { get } }
var right: ConstraintDescriptionExtendable { get } public var top: ConstraintDescriptionExtendable {
var leading: ConstraintDescriptionExtendable { get } return ConstraintDescriptionExtendable(self.backing.top)
var trailing: ConstraintDescriptionExtendable { get } }
var width: ConstraintDescriptionExtendable { get } public var bottom: ConstraintDescriptionExtendable {
var height: ConstraintDescriptionExtendable { get } return ConstraintDescriptionExtendable(self.backing.bottom)
var centerX: ConstraintDescriptionExtendable { get } }
var centerY: ConstraintDescriptionExtendable { get } public var right: ConstraintDescriptionExtendable {
var baseline: ConstraintDescriptionExtendable { get } return ConstraintDescriptionExtendable(self.backing.right)
}
public var leading: ConstraintDescriptionExtendable {
return ConstraintDescriptionExtendable(self.backing.leading)
}
public var trailing: ConstraintDescriptionExtendable {
return ConstraintDescriptionExtendable(self.backing.trailing)
}
public var width: ConstraintDescriptionExtendable {
return ConstraintDescriptionExtendable(self.backing.width)
}
public var height: ConstraintDescriptionExtendable {
return ConstraintDescriptionExtendable(self.backing.height)
}
public var centerX: ConstraintDescriptionExtendable {
return ConstraintDescriptionExtendable(self.backing.centerX)
}
public var centerY: ConstraintDescriptionExtendable {
return ConstraintDescriptionExtendable(self.backing.centerY)
}
public var baseline: ConstraintDescriptionExtendable {
return ConstraintDescriptionExtendable(self.backing.baseline)
}
@available(iOS 8.0, *) @available(iOS 8.0, *)
var firstBaseline: ConstraintDescriptionExtendable { get } public var firstBaseline: ConstraintDescriptionExtendable {
return ConstraintDescriptionExtendable(self.backing.firstBaseline)
}
@available(iOS 8.0, *) @available(iOS 8.0, *)
var leftMargin: ConstraintDescriptionExtendable { get } public var leftMargin: ConstraintDescriptionExtendable {
return ConstraintDescriptionExtendable(self.backing.leftMargin)
}
@available(iOS 8.0, *) @available(iOS 8.0, *)
var rightMargin: ConstraintDescriptionExtendable { get } public var rightMargin: ConstraintDescriptionExtendable {
return ConstraintDescriptionExtendable(self.backing.rightMargin)
}
@available(iOS 8.0, *) @available(iOS 8.0, *)
var topMargin: ConstraintDescriptionExtendable { get } public var topMargin: ConstraintDescriptionExtendable {
return ConstraintDescriptionExtendable(self.backing.topMargin)
}
@available(iOS 8.0, *) @available(iOS 8.0, *)
var bottomMargin: ConstraintDescriptionExtendable { get } public var bottomMargin: ConstraintDescriptionExtendable {
return ConstraintDescriptionExtendable(self.backing.bottomMargin)
}
@available(iOS 8.0, *) @available(iOS 8.0, *)
var leadingMargin: ConstraintDescriptionExtendable { get } public var leadingMargin: ConstraintDescriptionExtendable {
return ConstraintDescriptionExtendable(self.backing.leadingMargin)
}
@available(iOS 8.0, *) @available(iOS 8.0, *)
var trailingMargin: ConstraintDescriptionExtendable { get } public var trailingMargin: ConstraintDescriptionExtendable {
return ConstraintDescriptionExtendable(self.backing.trailingMargin)
}
@available(iOS 8.0, *) @available(iOS 8.0, *)
var centerXWithinMargins: ConstraintDescriptionExtendable { get } public var centerXWithinMargins: ConstraintDescriptionExtendable {
return ConstraintDescriptionExtendable(self.backing.centerXWithinMargins)
}
@available(iOS 8.0, *) @available(iOS 8.0, *)
var centerYWithinMargins: ConstraintDescriptionExtendable { get } public var centerYWithinMargins: ConstraintDescriptionExtendable {
return ConstraintDescriptionExtendable(self.backing.centerYWithinMargins)
}
} }
/** /**
Used to internally manage building constraint Used to internally manage building constraint
*/ */
internal class ConstraintDescription: ConstraintDescriptionExtendable, ConstraintDescriptionEditable, ConstraintDescriptionFinalizable { internal class ConstraintDescription {
internal var left: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Left) } private var left: ConstraintDescription { return self.addConstraint(ConstraintAttributes.Left) }
internal var top: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Top) } private var top: ConstraintDescription { return self.addConstraint(ConstraintAttributes.Top) }
internal var right: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Right) } private var right: ConstraintDescription { return self.addConstraint(ConstraintAttributes.Right) }
internal var bottom: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Bottom) } private var bottom: ConstraintDescription { return self.addConstraint(ConstraintAttributes.Bottom) }
internal var leading: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Leading) } private var leading: ConstraintDescription { return self.addConstraint(ConstraintAttributes.Leading) }
internal var trailing: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Trailing) } private var trailing: ConstraintDescription { return self.addConstraint(ConstraintAttributes.Trailing) }
internal var width: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Width) } private var width: ConstraintDescription { return self.addConstraint(ConstraintAttributes.Width) }
internal var height: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Height) } private var height: ConstraintDescription { return self.addConstraint(ConstraintAttributes.Height) }
internal var centerX: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.CenterX) } private var centerX: ConstraintDescription { return self.addConstraint(ConstraintAttributes.CenterX) }
internal var centerY: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.CenterY) } private var centerY: ConstraintDescription { return self.addConstraint(ConstraintAttributes.CenterY) }
internal var baseline: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.Baseline) } private var baseline: ConstraintDescription { return self.addConstraint(ConstraintAttributes.Baseline) }
@available(iOS 8.0, *) @available(iOS 8.0, *)
internal var firstBaseline: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.FirstBaseline) } private var firstBaseline: ConstraintDescription { return self.addConstraint(ConstraintAttributes.FirstBaseline) }
@available(iOS 8.0, *) @available(iOS 8.0, *)
internal var leftMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.LeftMargin) } private var leftMargin: ConstraintDescription { return self.addConstraint(ConstraintAttributes.LeftMargin) }
@available(iOS 8.0, *) @available(iOS 8.0, *)
internal var rightMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.RightMargin) } private var rightMargin: ConstraintDescription { return self.addConstraint(ConstraintAttributes.RightMargin) }
@available(iOS 8.0, *) @available(iOS 8.0, *)
internal var topMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.TopMargin) } private var topMargin: ConstraintDescription { return self.addConstraint(ConstraintAttributes.TopMargin) }
@available(iOS 8.0, *) @available(iOS 8.0, *)
internal var bottomMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.BottomMargin) } private var bottomMargin: ConstraintDescription { return self.addConstraint(ConstraintAttributes.BottomMargin) }
@available(iOS 8.0, *) @available(iOS 8.0, *)
internal var leadingMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.LeadingMargin) } private var leadingMargin: ConstraintDescription { return self.addConstraint(ConstraintAttributes.LeadingMargin) }
@available(iOS 8.0, *) @available(iOS 8.0, *)
internal var trailingMargin: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.TrailingMargin) } private var trailingMargin: ConstraintDescription { return self.addConstraint(ConstraintAttributes.TrailingMargin) }
@available(iOS 8.0, *) @available(iOS 8.0, *)
internal var centerXWithinMargins: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.CenterXWithinMargins) } private var centerXWithinMargins: ConstraintDescription { return self.addConstraint(ConstraintAttributes.CenterXWithinMargins) }
@available(iOS 8.0, *) @available(iOS 8.0, *)
internal var centerYWithinMargins: ConstraintDescriptionExtendable { return self.addConstraint(ConstraintAttributes.CenterYWithinMargins) } private var centerYWithinMargins: ConstraintDescription { return self.addConstraint(ConstraintAttributes.CenterYWithinMargins) }
// MARK: initializer // MARK: initializer
@ -246,108 +339,69 @@ internal class ConstraintDescription: ConstraintDescriptionExtendable, Constrain
self.toItem = ConstraintItem(object: nil, attributes: ConstraintAttributes.None) self.toItem = ConstraintItem(object: nil, attributes: ConstraintAttributes.None)
} }
// MARK: equalTo
internal func equalTo(other: ConstraintItem) -> ConstraintDescriptionEditable {
return self.constrainTo(other, relation: .Equal)
}
internal func equalTo(other: RelationTarget) -> ConstraintDescriptionEditable {
return self.constrainTo(other, relation: .Equal)
}
@available(iOS 7.0, *)
internal func equalTo(other: LayoutSupport) -> ConstraintDescriptionEditable {
return self.constrainTo(other, relation: .Equal)
}
// MARK: lessThanOrEqualTo
internal func lessThanOrEqualTo(other: ConstraintItem) -> ConstraintDescriptionEditable {
return self.constrainTo(other, relation: .LessThanOrEqualTo)
}
internal func lessThanOrEqualTo(other: RelationTarget) -> ConstraintDescriptionEditable {
return self.constrainTo(other, relation: .LessThanOrEqualTo)
}
@available(iOS 7.0, *)
internal func lessThanOrEqualTo(other: LayoutSupport) -> ConstraintDescriptionEditable {
return self.constrainTo(other, relation: .LessThanOrEqualTo)
}
// MARK: greaterThanOrEqualTo
internal func greaterThanOrEqualTo(other: ConstraintItem) -> ConstraintDescriptionEditable {
return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
}
internal func greaterThanOrEqualTo(other: RelationTarget) -> ConstraintDescriptionEditable {
return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
}
@available(iOS 7.0, *)
internal func greaterThanOrEqualTo(other: LayoutSupport) -> ConstraintDescriptionEditable {
return self.constrainTo(other, relation: .GreaterThanOrEqualTo)
}
// MARK: multiplier // MARK: multiplier
internal func multipliedBy(amount: FloatConvertible) -> ConstraintDescriptionEditable { private func multipliedBy(amount: FloatConvertible) -> ConstraintDescription {
self.multiplier = amount.floatValue self.multiplier = amount.floatValue
return self return self
} }
internal func dividedBy(amount: FloatConvertible) -> ConstraintDescriptionEditable { private func dividedBy(amount: FloatConvertible) -> ConstraintDescription {
self.multiplier = 1.0 / amount.floatValue; self.multiplier = 1.0 / amount.floatValue;
return self return self
} }
// MARK: offset // MARK: offset
internal func offset(amount: FloatConvertible) -> ConstraintDescriptionEditable { private func offset(amount: FloatConvertible) -> ConstraintDescription {
self.constant = amount.floatValue self.constant = amount.floatValue
return self return self
} }
internal func offset(amount: CGPoint) -> ConstraintDescriptionEditable { private func offset(amount: CGPoint) -> ConstraintDescription {
self.constant = amount self.constant = amount
return self return self
} }
internal func offset(amount: CGSize) -> ConstraintDescriptionEditable { private func offset(amount: CGSize) -> ConstraintDescription {
self.constant = amount self.constant = amount
return self return self
} }
internal func offset(amount: EdgeInsets) -> ConstraintDescriptionEditable { private func offset(amount: EdgeInsets) -> ConstraintDescription {
self.constant = amount self.constant = amount
return self return self
} }
// MARK: inset // MARK: inset
internal func inset(amount: FloatConvertible) -> ConstraintDescriptionEditable { private func inset(amount: FloatConvertible) -> ConstraintDescription {
let value = CGFloat(amount.floatValue) let value = CGFloat(amount.floatValue)
self.constant = EdgeInsets(top: value, left: value, bottom: -value, right: -value) self.constant = EdgeInsets(top: value, left: value, bottom: -value, right: -value)
return self return self
} }
internal func inset(amount: EdgeInsets) -> ConstraintDescriptionEditable { private func inset(amount: EdgeInsets) -> ConstraintDescription {
self.constant = EdgeInsets(top: amount.top, left: amount.left, bottom: -amount.bottom, right: -amount.right) self.constant = EdgeInsets(top: amount.top, left: amount.left, bottom: -amount.bottom, right: -amount.right)
return self return self
} }
// MARK: priority // MARK: priority
internal func priority(priority: FloatConvertible) -> ConstraintDescriptionFinalizable { private func priority(priority: FloatConvertible) -> ConstraintDescription {
self.priority = priority.floatValue self.priority = priority.floatValue
return self return self
} }
internal func priorityRequired() -> ConstraintDescriptionFinalizable { private func priorityRequired() -> ConstraintDescription {
return self.priority(1000.0) return self.priority(1000.0)
} }
internal func priorityHigh() -> ConstraintDescriptionFinalizable { private func priorityHigh() -> ConstraintDescription {
return self.priority(750.0) return self.priority(750.0)
} }
internal func priorityMedium() -> ConstraintDescriptionFinalizable { private func priorityMedium() -> ConstraintDescription {
#if os(iOS) || os(tvOS) #if os(iOS) || os(tvOS)
return self.priority(500.0) return self.priority(500.0)
#else #else
return self.priority(501.0) return self.priority(501.0)
#endif #endif
} }
internal func priorityLow() -> ConstraintDescriptionFinalizable { private func priorityLow() -> ConstraintDescription {
return self.priority(250.0) return self.priority(250.0)
} }
@ -416,35 +470,32 @@ internal class ConstraintDescription: ConstraintDescriptionExtendable, Constrain
return self return self
} }
private func constrainTo(other: ConstraintItem, relation: ConstraintRelation) -> ConstraintDescription { private func constrainTo(other: RelationTarget, relation: ConstraintRelation) -> ConstraintDescription {
if other.attributes != ConstraintAttributes.None { if let constant = other as? FloatConvertible {
let toLayoutAttributes = other.attributes.layoutAttributes self.constant = constant.floatValue
}
let item = other.constraintItem
if item.attributes != ConstraintAttributes.None {
let toLayoutAttributes = item.attributes.layoutAttributes
if toLayoutAttributes.count > 1 { if toLayoutAttributes.count > 1 {
let fromLayoutAttributes = self.fromItem.attributes.layoutAttributes let fromLayoutAttributes = self.fromItem.attributes.layoutAttributes
if toLayoutAttributes != fromLayoutAttributes { if toLayoutAttributes != fromLayoutAttributes {
NSException(name: "Invalid Constraint", reason: "Cannot constrain to multiple non identical attributes", userInfo: nil).raise() NSException(name: "Invalid Constraint", reason: "Cannot constrain to multiple non identical attributes", userInfo: nil).raise()
return self return self
} }
other.attributes = ConstraintAttributes.None item.attributes = ConstraintAttributes.None
} }
} }
self.toItem = other self.toItem = item
self.relation = relation self.relation = relation
return self return self
} }
private func constrainTo(other: RelationTarget, relation: ConstraintRelation) -> ConstraintDescription {
return constrainTo(other.constraintItem, relation: relation)
}
@available(iOS 7.0, *) @available(iOS 7.0, *)
private func constrainTo(other: LayoutSupport, relation: ConstraintRelation) -> ConstraintDescription { private func constrainTo(other: LayoutSupport, relation: ConstraintRelation) -> ConstraintDescription {
return constrainTo(ConstraintItem(object: self, attributes: ConstraintAttributes.None), relation: relation) return constrainTo(ConstraintItem(object: other, attributes: ConstraintAttributes.None), relation: relation, location: location)
}
private func constrainTo(other: FloatConvertible, relation: ConstraintRelation) -> ConstraintDescription {
self.constant = other.floatValue
return constrainTo(ConstraintItem(object: nil, attributes: ConstraintAttributes.None), relation: relation)
} }
} }

4
Source/ConstraintMaker.swift
View File

@ -129,11 +129,11 @@ public class ConstraintMaker {
internal let view: View internal let view: View
internal var constraintDescriptions = [ConstraintDescription]() internal var constraintDescriptions = [ConstraintDescription]()
internal func makeConstraintDescription(attributes: ConstraintAttributes) -> ConstraintDescription { internal func makeConstraintDescription(attributes: ConstraintAttributes) -> ConstraintDescriptionExtendable {
let item = ConstraintItem(object: self.view, attributes: attributes) let item = ConstraintItem(object: self.view, attributes: attributes)
let constraintDescription = ConstraintDescription(fromItem: item) let constraintDescription = ConstraintDescription(fromItem: item)
self.constraintDescriptions.append(constraintDescription) self.constraintDescriptions.append(constraintDescription)
return constraintDescription return ConstraintDescriptionExtendable(constraintDescription)
} }
internal class func prepareConstraints(view view: View, file: String = "Unknown", line: UInt = 0, @noescape closure: (make: ConstraintMaker) -> Void) -> [Constraint] { internal class func prepareConstraints(view view: View, file: String = "Unknown", line: UInt = 0, @noescape closure: (make: ConstraintMaker) -> Void) -> [Constraint] {