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@@ -27,10 +27,10 @@
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import AppKit
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#endif
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-
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public class Constraint {
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internal let sourceLocation: (String, UInt)
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+ internal let label: String?
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private let from: ConstraintItem
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private let to: ConstraintItem
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@@ -46,7 +46,7 @@ public class Constraint {
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self.updateConstantAndPriorityIfNeeded()
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}
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}
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- private var installInfo: ConstraintInstallInfo? = nil
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+ private let layoutConstraints: NSHashTable<LayoutConstraint>
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// MARK: Initialization
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@@ -54,6 +54,7 @@ public class Constraint {
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to: ConstraintItem,
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relation: ConstraintRelation,
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sourceLocation: (String, UInt),
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+ label: String?,
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multiplier: ConstraintMultiplierTarget,
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constant: ConstraintConstantTarget,
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priority: ConstraintPriorityTarget) {
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@@ -61,27 +62,67 @@ public class Constraint {
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self.to = to
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self.relation = relation
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self.sourceLocation = sourceLocation
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+ self.label = label
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self.multiplier = multiplier
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self.constant = constant
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self.priority = priority
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+ self.layoutConstraints = NSHashTable<LayoutConstraint>.weakObjects()
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+
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+ // get attributes
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+ let layoutFromAttributes = self.from.attributes.layoutAttributes
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+ let layoutToAttributes = self.to.attributes.layoutAttributes
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+
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+ // get layout from
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+ let layoutFrom: ConstraintView = self.from.view!
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+
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+ // get relation
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+ let layoutRelation = self.relation.layoutRelation
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+
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+ for layoutFromAttribute in layoutFromAttributes {
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+ // get layout to attribute
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+ let layoutToAttribute = (layoutToAttributes.count > 0) ? layoutToAttributes[0] : layoutFromAttribute
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+
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+ // get layout constant
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+ let layoutConstant: CGFloat = self.constant.constraintConstantTargetValueFor(layoutAttribute: layoutToAttribute)
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+
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+ // get layout to
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+ #if os(iOS) || os(tvOS)
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+ let layoutTo: AnyObject? = self.to.view ?? self.to.layoutSupport
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+ #else
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+ let layoutTo: AnyObject? = self.to.view
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+ #endif
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+
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+ // create layout constraint
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+ let layoutConstraint = LayoutConstraint(
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+ item: layoutFrom,
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+ attribute: layoutFromAttribute,
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+ relatedBy: layoutRelation,
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+ toItem: layoutTo,
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+ attribute: layoutToAttribute,
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+ multiplier: self.multiplier.constraintMultiplierTargetValue,
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+ constant: layoutConstant
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+ )
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+
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+ // set label
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+ layoutConstraint.label = self.label
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+
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+ // set priority
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+ layoutConstraint.priority = self.priority.constraintPriorityTargetValue
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+
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+ // set constraint
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+ layoutConstraint.constraint = self
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+
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+ // append
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+ self.layoutConstraints.add(layoutConstraint)
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+ }
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}
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// MARK: Public
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- public func install() -> [NSLayoutConstraint] {
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- return self.installIfNeeded(updateExisting: false)
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- }
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-
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- public func uninstall() {
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- self.uninstallIfNeeded()
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- }
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-
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- @available(iOS 8.0, OSX 10.10, *)
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public func activate() {
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self.activateIfNeeded()
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}
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- @available(iOS 8.0, OSX 10.10, *)
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public func deactivate() {
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self.deactivateIfNeeded()
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}
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@@ -128,248 +169,55 @@ public class Constraint {
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// MARK: Internal
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internal func updateConstantAndPriorityIfNeeded() {
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- guard let installInfo = self.installInfo else {
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- return
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- }
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- for layoutConstraint in installInfo.layoutConstraints.allObjects as! [LayoutConstraint] {
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+ for layoutConstraint in self.layoutConstraints.allObjects {
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let attribute = (layoutConstraint.secondAttribute == .notAnAttribute) ? layoutConstraint.firstAttribute : layoutConstraint.secondAttribute
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layoutConstraint.constant = self.constant.constraintConstantTargetValueFor(layoutAttribute: attribute)
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layoutConstraint.priority = self.priority.constraintPriorityTargetValue
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}
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}
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- internal func installIfNeeded(updateExisting: Bool = false) -> [NSLayoutConstraint] {
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- let installOnView: ConstraintView?
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-
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- if let view = self.to.view {
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- guard let closestSuperview = closestCommonSuperviewFromView(self.from.view, toView: view) else {
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- fatalError("Cannot Install Constraint. No common superview. (\(self.sourceLocation.0), \(self.sourceLocation.1))")
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- }
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- installOnView = closestSuperview
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- } else if self.from.attributes.isSubset(of: ConstraintAttributes.Width + ConstraintAttributes.Height) {
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- installOnView = self.from.view
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- } else {
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- guard let superview = self.from.view?.superview else {
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- fatalError("Cannot Install Constraint. No superview. (\(self.sourceLocation.0), \(self.sourceLocation.1))")
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- }
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- installOnView = superview
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- }
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-
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- guard self.installInfo?.view == nil ||
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- self.installInfo?.view == installOnView else {
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- fatalError("Cannot Install Constraint. Already installed on different view. (\(self.sourceLocation.0), \(self.sourceLocation.1))")
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- }
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-
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- // setup array to store new layout constraints
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- var newLayoutConstraints = [LayoutConstraint]()
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-
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- // get attributes
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- let layoutFromAttributes = self.from.attributes.layoutAttributes
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- let layoutToAttributes = self.to.attributes.layoutAttributes
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-
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- // get layout from
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- let layoutFrom: ConstraintView = self.from.view!
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-
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- // get relation
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- let layoutRelation = self.relation.layoutRelation
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-
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- for layoutFromAttribute in layoutFromAttributes {
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- // get layout to attribute
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- let layoutToAttribute = (layoutToAttributes.count > 0) ? layoutToAttributes[0] : layoutFromAttribute
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-
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- // get layout constant
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- let layoutConstant: CGFloat = self.constant.constraintConstantTargetValueFor(layoutAttribute: layoutToAttribute)
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-
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- // get layout to
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- #if os(iOS) || os(tvOS)
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- var layoutTo: AnyObject? = self.to.view ?? self.to.layoutSupport
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- #else
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- var layoutTo: AnyObject? = self.to.view
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- #endif
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- if layoutTo == nil && layoutToAttribute != .width && layoutToAttribute != .height {
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- layoutTo = installOnView
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- }
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-
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- // create layout constraint
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- let layoutConstraint = LayoutConstraint(
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- item: layoutFrom,
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- attribute: layoutFromAttribute,
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- relatedBy: layoutRelation,
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- toItem: layoutTo,
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- attribute: layoutToAttribute,
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- multiplier: self.multiplier.constraintMultiplierTargetValue,
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- constant: layoutConstant
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- )
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-
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- // set priority
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- layoutConstraint.priority = self.priority.constraintPriorityTargetValue
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-
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- // set constraint
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- layoutConstraint.constraint = self
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-
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- // append
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- newLayoutConstraints.append(layoutConstraint)
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- }
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+ internal func activateIfNeeded(updatingExisting: Bool = false) {
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+ let view = self.from.view!
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+ let layoutConstraints = self.layoutConstraints.allObjects
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+ let existingLayoutConstraints = view.snp.layoutConstraints
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- // updating logic
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- if updateExisting {
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-
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- // get existing constraints for this view
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- let existingLayoutConstraints = layoutFrom.snp.installedLayoutConstraints.reversed()
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+ if updatingExisting && existingLayoutConstraints.count > 0 {
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- // array that will contain only new layout constraints to keep
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- var newLayoutConstraintsToKeep = [LayoutConstraint]()
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-
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- // begin looping
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- for layoutConstraint in newLayoutConstraints {
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- // layout constraint that should be updated
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- var updateLayoutConstraint: LayoutConstraint? = nil
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-
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- // loop through existing and check for match
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- for existingLayoutConstraint in existingLayoutConstraints {
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- if existingLayoutConstraint == layoutConstraint {
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- updateLayoutConstraint = existingLayoutConstraint
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- break
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- }
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+ for layoutConstraint in layoutConstraints {
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+ let existingLayoutConstraint = existingLayoutConstraints.first { $0 == layoutConstraint }
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+ guard let updateLayoutConstraint = existingLayoutConstraint else {
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+ fatalError("Updated constraint could not find existing matching constraint to update: \(layoutConstraint)")
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}
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- // if we have existing one lets just update the constant
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- if updateLayoutConstraint != nil {
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- updateLayoutConstraint!.constant = layoutConstraint.constant
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- }
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- // otherwise add this layout constraint to new keep list
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- else {
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- newLayoutConstraintsToKeep.append(layoutConstraint)
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- }
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+ let updateLayoutAttribute = (updateLayoutConstraint.secondAttribute == .notAnAttribute) ? updateLayoutConstraint.firstAttribute : updateLayoutConstraint.secondAttribute
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+ updateLayoutConstraint.constant = self.constant.constraintConstantTargetValueFor(layoutAttribute: updateLayoutAttribute)
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}
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- // set constraints to only new ones
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- newLayoutConstraints = newLayoutConstraintsToKeep
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- }
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-
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- // add constraints
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- #if SNAPKIT_DEPLOYMENT_LEGACY && (os(iOS) || os(tvOS))
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- if #available(iOS 8.0, *) {
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- NSLayoutConstraint.activate(newLayoutConstraints)
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- } else {
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- installOnView?.addConstraints(newLayoutConstraints)
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- }
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- #else
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- NSLayoutConstraint.activate(newLayoutConstraints)
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- #endif
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-
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- // set install info
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- self.installInfo = ConstraintInstallInfo(view: installOnView, layoutConstraints: NSHashTable.weakObjects())
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-
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- // store which layout constraints are installed for this constraint
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- for layoutConstraint in newLayoutConstraints {
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- self.installInfo!.layoutConstraints.add(layoutConstraint)
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- }
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-
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- // store the layout constraints against the layout from view
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- layoutFrom.snp.appendInstalledLayoutConstraints(newLayoutConstraints)
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-
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- return newLayoutConstraints
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- }
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-
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- internal func uninstallIfNeeded() {
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- defer {
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- self.installInfo = nil
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- }
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-
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- guard let installedLayoutConstraints = self.installInfo?.layoutConstraints.allObjects as? [LayoutConstraint],
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- installedLayoutConstraints.count > 0 else {
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- return
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- }
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-
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- #if SNAPKIT_DEPLOYMENT_LEGACY && !os(OSX)
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- if #available(iOS 8.0, *) {
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- NSLayoutConstraint.deactivate(installedLayoutConstraints)
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- } else if let installedOnView = installInfo?.view {
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- installedOnView.removeConstraints(installedLayoutConstraints)
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- }
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- #else
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- NSLayoutConstraint.deactivate(installedLayoutConstraints)
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- #endif
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-
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- // remove the constraints from the from item view
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- self.from.view?.snp.removeInstalledLayoutConstraints(installedLayoutConstraints)
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- }
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-
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- internal func activateIfNeeded() {
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- guard self.installInfo != nil else {
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- _ = self.installIfNeeded()
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- return
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- }
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- #if SNAPKIT_DEPLOYMENT_LEGACY
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- guard #available(iOS 8.0, OSX 10.10, *) else {
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- _ = self.installIfNeeded()
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- return
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- }
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- #endif
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-
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- guard let layoutConstraints = self.installInfo?.layoutConstraints.allObjects as? [LayoutConstraint],
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- layoutConstraints.count > 0 else {
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- return
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+ } else {
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+ NSLayoutConstraint.activate(layoutConstraints)
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+ view.snp.add(layoutConstraints: layoutConstraints)
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}
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- NSLayoutConstraint.activate(layoutConstraints)
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+ print(view, layoutConstraints.count, existingLayoutConstraints.count)
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}
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internal func deactivateIfNeeded() {
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- #if SNAPKIT_DEPLOYMENT_LEGACY
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- guard #available(iOS 8.0, OSX 10.10, *) else {
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- return
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- }
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- #endif
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-
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- guard let layoutConstraints = self.installInfo?.layoutConstraints.allObjects as? [LayoutConstraint],
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- layoutConstraints.count > 0 else {
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- return
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- }
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-
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+ let view = self.from.view!
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+ let layoutConstraints = self.layoutConstraints.allObjects
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NSLayoutConstraint.deactivate(layoutConstraints)
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+ view.snp.remove(layoutConstraints: layoutConstraints)
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}
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-
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}
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-private final class ConstraintInstallInfo {
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+extension Constraint: Hashable {
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- private weak var view: ConstraintView? = nil
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- private let layoutConstraints: NSHashTable<AnyObject>
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-
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- private init(view: ConstraintView?, layoutConstraints: NSHashTable<AnyObject>) {
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- self.view = view
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- self.layoutConstraints = layoutConstraints
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+ public var hashValue: Int {
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+ return self.layoutConstraints.hashValue
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}
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}
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-private func closestCommonSuperviewFromView(_ fromView: ConstraintView?, toView: ConstraintView?) -> ConstraintView? {
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- var views = Set<ConstraintView>()
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- var fromView = fromView
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- var toView = toView
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- repeat {
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- if let view = toView {
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- if views.contains(view) {
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- return view
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- }
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- views.insert(view)
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- toView = view.superview
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- }
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- if let view = fromView {
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- if views.contains(view) {
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- return view
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- }
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- views.insert(view)
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- fromView = view.superview
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- }
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- } while (fromView != nil || toView != nil)
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-
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- return nil
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-}
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-
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-private func ==(lhs: Constraint, rhs: Constraint) -> Bool {
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+public func ==(lhs: Constraint, rhs: Constraint) -> Bool {
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return (lhs.from == rhs.from &&
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lhs.to == rhs.to &&
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lhs.relation == rhs.relation &&
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Robert Payne