From dbcd70e9936dc398a986f091a6a9886ed4ffce99 Mon Sep 17 00:00:00 2001
From: Frederic Barthelemy <git@fbartho.com>
Date: Sat, 9 Sep 2017 15:38:06 -0700
Subject: [PATCH] Switch calls to NSLayoutConstraint.(de)activate

AppleDocs say these are typically faster than directly adjusting isActive
---
 Sources/NSConstraintLayoutSet.swift | 19 ++++++++-----------
 Sources/UIView+Extensions.swift     | 14 +++++++++-----
 2 files changed, 17 insertions(+), 16 deletions(-)

diff --git a/Sources/NSConstraintLayoutSet.swift b/Sources/NSConstraintLayoutSet.swift
index a908fff5..0176433d 100644
--- a/Sources/NSConstraintLayoutSet.swift
+++ b/Sources/NSConstraintLayoutSet.swift
@@ -48,22 +48,19 @@ public class NSLayoutConstraintSet {
         self.width = width
         self.height = height
     }
-    
-    private func forEach(_ body: (NSLayoutConstraint) -> Void) {
-        let constraints = [top, bottom, left, right, centerX, centerY, width, height]
-        for constraint in constraints {
-            if let constraint = constraint {
-                body(constraint)
-            }
-        }
-    }
+
+	/// All of the currently configured constraints
+	private var availableConstraints: [NSLayoutConstraint] {
+		return [top, bottom, left, right, centerX, centerY, width, height]
+			.flatMap {$0}
+	}
     
     /// Activates all of the non-nil constraints
     ///
     /// - Returns: Self
     @discardableResult
     func activate() -> Self {
-        forEach { $0.isActive = true }
+        NSLayoutConstraint.activate(availableConstraints)
         return self
     }
     
@@ -72,7 +69,7 @@ public class NSLayoutConstraintSet {
     /// - Returns: Self
     @discardableResult
     func deactivate() -> Self {
-        forEach { $0.isActive = false }
+        NSLayoutConstraint.deactivate(availableConstraints)
         return self
     }
 }
diff --git a/Sources/UIView+Extensions.swift b/Sources/UIView+Extensions.swift
index 7bf913c6..e6cfc97f 100644
--- a/Sources/UIView+Extensions.swift
+++ b/Sources/UIView+Extensions.swift
@@ -31,10 +31,14 @@ extension UIView {
             return
         }
         translatesAutoresizingMaskIntoConstraints = false
-        leftAnchor.constraint(equalTo: superview.leftAnchor).isActive = true
-        rightAnchor.constraint(equalTo: superview.rightAnchor).isActive = true
-        topAnchor.constraint(equalTo: superview.topAnchor).isActive = true
-        bottomAnchor.constraint(equalTo: superview.bottomAnchor).isActive = true
+
+		let constraints: [NSLayoutConstraint] = [
+			leftAnchor.constraint(equalTo: superview.leftAnchor),
+			rightAnchor.constraint(equalTo: superview.rightAnchor),
+			topAnchor.constraint(equalTo: superview.topAnchor),
+			bottomAnchor.constraint(equalTo: superview.bottomAnchor),
+			]
+		NSLayoutConstraint.activate(constraints)
     }
 
     @discardableResult
@@ -83,7 +87,7 @@ extension UIView {
             constraints.append(constraint)
         }
         
-        constraints.forEach { $0.isActive = true }
+        NSLayoutConstraint.activate(constraints)
         return constraints
     }
 }