cleanup internally in Layout class

Sources/iOS/Layout.swift

@@ -629,6 +629,19 @@ public class Layout {
     }
 }
 
+fileprivate extension Layout {
+    /**
+     Updates and lays out the constraints for a given view.
+     - Parameter for view: A UIView.
+     */
+    class func updateConstraints(for view: UIView) {
+        view.updateConstraintsIfNeeded()
+        view.updateConstraints()
+        view.setNeedsLayout()
+        view.layoutIfNeeded()
+    }
+}
+
 /// Layout
 extension Layout {
     /**
@@ -640,9 +653,7 @@ extension Layout {
     public class func width(parent: UIView, child: UIView, width: CGFloat = 0) {
         prepareForConstraint(parent, child: child)
         parent.addConstraint(NSLayoutConstraint(item: child, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .width, multiplier: 1, constant: width))
-        child.updateConstraints()
-        child.setNeedsLayout()
-        child.layoutIfNeeded()
+        updateConstraints(for: child)
     }
     
     /**
@@ -654,9 +665,7 @@ extension Layout {
     public class func height(parent: UIView, child: UIView, height: CGFloat = 0) {
         prepareForConstraint(parent, child: child)
         parent.addConstraint(NSLayoutConstraint(item: child, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1, constant: height))
-        child.updateConstraints()
-        child.setNeedsLayout()
-        child.layoutIfNeeded()
+        updateConstraints(for: child)
     }
     
     /**
@@ -681,6 +690,7 @@ extension Layout {
      */
     public class func horizontally(parent: UIView, children: [UIView], left: CGFloat = 0, right: CGFloat = 0, interimSpace: InterimSpace = 0) {
         prepareForConstraint(parent, children: children)
+        
         if 0 < children.count {
             parent.addConstraint(NSLayoutConstraint(item: children[0], attribute: .left, relatedBy: .equal, toItem: parent, attribute: .left, multiplier: 1, constant: left))
             for i in 1..<children.count {
@@ -689,10 +699,9 @@ extension Layout {
             }
             parent.addConstraint(NSLayoutConstraint(item: children[children.count - 1], attribute: .right, relatedBy: .equal, toItem: parent, attribute: .right, multiplier: 1, constant: -right))
         }
+        
         for child in children {
-            child.updateConstraints()
-            child.setNeedsLayout()
-            child.layoutIfNeeded()
+            updateConstraints(for: child)
         }
     }
     
@@ -718,9 +727,7 @@ extension Layout {
         }
         
         for child in children {
-            child.updateConstraints()
-            child.setNeedsLayout()
-            child.layoutIfNeeded()
+            updateConstraints(for: child)
         }
     }
     
@@ -733,13 +740,9 @@ extension Layout {
      */
     public class func horizontally(parent: UIView, child: UIView, left: CGFloat = 0, right: CGFloat = 0) {
         prepareForConstraint(parent, child: child)
-        
         parent.addConstraint(NSLayoutConstraint(item: child, attribute: .left, relatedBy: .equal, toItem: parent, attribute: .left, multiplier: 1, constant: left))
         parent.addConstraint(NSLayoutConstraint(item: child, attribute: .right, relatedBy: .equal, toItem: parent, attribute: .right, multiplier: 1, constant: -right))
-        
-        child.updateConstraints()
-        child.setNeedsLayout()
-        child.layoutIfNeeded()
+        updateConstraints(for: child)
     }
     
     /**
@@ -751,13 +754,9 @@ extension Layout {
      */
     public class func vertically(parent: UIView, child: UIView, top: CGFloat = 0, bottom: CGFloat = 0) {
         prepareForConstraint(parent, child: child)
-        
         parent.addConstraint(NSLayoutConstraint(item: child, attribute: .top, relatedBy: .equal, toItem: parent, attribute: .top, multiplier: 1, constant: top))
         parent.addConstraint(NSLayoutConstraint(item: child, attribute: .bottom, relatedBy: .equal, toItem: parent, attribute: .bottom, multiplier: 1, constant: -bottom))
-        
-        child.updateConstraints()
-        child.setNeedsLayout()
-        child.layoutIfNeeded()
+        updateConstraints(for: child)
     }
     
     /**
@@ -783,12 +782,8 @@ extension Layout {
      */
     public class func top(parent: UIView, child: UIView, top: CGFloat = 0) {
         prepareForConstraint(parent, child: child)
-        
         parent.addConstraint(NSLayoutConstraint(item: child, attribute: .top, relatedBy: .equal, toItem: parent, attribute: .top, multiplier: 1, constant: top))
-        
-        child.updateConstraints()
-        child.setNeedsLayout()
-        child.layoutIfNeeded()
+        updateConstraints(for: child)
     }
     
     /**
@@ -800,12 +795,8 @@ extension Layout {
      */
     public class func left(parent: UIView, child: UIView, left: CGFloat = 0) {
         prepareForConstraint(parent, child: child)
-        
         parent.addConstraint(NSLayoutConstraint(item: child, attribute: .left, relatedBy: .equal, toItem: parent, attribute: .left, multiplier: 1, constant: left))
-        
-        child.updateConstraints()
-        child.setNeedsLayout()
-        child.layoutIfNeeded()
+        updateConstraints(for: child)
     }
     
     /**
@@ -817,12 +808,8 @@ extension Layout {
      */
     public class func bottom(parent: UIView, child: UIView, bottom: CGFloat = 0) {
         prepareForConstraint(parent, child: child)
-        
         parent.addConstraint(NSLayoutConstraint(item: child, attribute: .bottom, relatedBy: .equal, toItem: parent, attribute: .bottom, multiplier: 1, constant: -bottom))
-        
-        child.updateConstraints()
-        child.setNeedsLayout()
-        child.layoutIfNeeded()
+        updateConstraints(for: child)
     }
     
     /**
@@ -834,12 +821,8 @@ extension Layout {
      */
     public class func right(parent: UIView, child: UIView, right: CGFloat = 0) {
         prepareForConstraint(parent, child: child)
-        
         parent.addConstraint(NSLayoutConstraint(item: child, attribute: .right, relatedBy: .equal, toItem: parent, attribute: .right, multiplier: 1, constant: -right))
-        
-        child.updateConstraints()
-        child.setNeedsLayout()
-        child.layoutIfNeeded()
+        updateConstraints(for: child)
     }
     
     /**
@@ -916,12 +899,8 @@ extension Layout {
      */
     public class func centerHorizontally(parent: UIView, child: UIView, offset: CGFloat = 0) {
         prepareForConstraint(parent, child: child)
-        
         parent.addConstraint(NSLayoutConstraint(item: child, attribute: .centerX, relatedBy: .equal, toItem: parent, attribute: .centerX, multiplier: 1, constant: offset))
-        
-        child.updateConstraints()
-        child.setNeedsLayout()
-        child.layoutIfNeeded()
+        updateConstraints(for: child)
     }
     
     /**
@@ -933,12 +912,8 @@ extension Layout {
      */
     public class func centerVertically(parent: UIView, child: UIView, offset: CGFloat = 0) {
         prepareForConstraint(parent, child: child)
-        
         parent.addConstraint(NSLayoutConstraint(item: child, attribute: .centerY, relatedBy: .equal, toItem: parent, attribute: .centerY, multiplier: 1, constant: offset))
-        
-        child.updateConstraints()
-        child.setNeedsLayout()
-        child.layoutIfNeeded()
+        updateConstraints(for: child)
     }
     
     /**