From 3c3a76cf6eec62b579865b34c2262c4bdf387ef6 Mon Sep 17 00:00:00 2001
From: Robert Payne <robertpayne@me.com>
Date: Sat, 11 Apr 2015 21:44:46 +1200
Subject: [PATCH] Added activate/deactivate

---
 Source/Constraint.swift | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/Source/Constraint.swift b/Source/Constraint.swift
index 34b44a6..020aec2 100644
--- a/Source/Constraint.swift
+++ b/Source/Constraint.swift
@@ -291,6 +291,28 @@ final public class Constraint {
         self.uninstallFromView()
     }
     
+    public func activate() {
+        if NSLayoutConstraint.respondsToSelector("activateConstraints:") && self.installInfo != nil {
+            let layoutConstraints = self.installInfo!.layoutConstraints.allObjects as! [LayoutConstraint]
+            if layoutConstraints.count > 0 {
+                NSLayoutConstraint.activateConstraints(layoutConstraints)
+            }
+        } else {
+            self.install()
+        }
+    }
+    
+    public func deactivate() {
+        if NSLayoutConstraint.respondsToSelector("deactivateConstraints:") && self.installInfo != nil {
+            let layoutConstraints = self.installInfo!.layoutConstraints.allObjects as! [LayoutConstraint]
+            if layoutConstraints.count > 0 {
+                NSLayoutConstraint.deactivateConstraints(layoutConstraints)
+            }
+        } else {
+            self.uninstall()
+        }
+    }
+    
     // MARK: internal
     
     internal func installOnView(updateExisting: Bool = false) -> [LayoutConstraint] {