updated SideNavigationViewController to utilize alpha for backdrop animation

Examples/Programmatic/App/App/AppMenuViewController.swift

@@ -52,14 +52,12 @@ class AppMenuViewController: MenuViewController {
 	override func openMenu(completion: (() -> Void)? = nil) {
 		super.openMenu(completion)
 		sideNavigationViewController?.enabled = false
-		mainViewController.view.alpha = 0.5
 		(menuView.menu.views?.first as? MaterialButton)?.animate(MaterialAnimation.rotate(0.125))
 	}
 	
 	override func closeMenu(completion: (() -> Void)? = nil) {
 		super.closeMenu(completion)
 		sideNavigationViewController?.enabled = true
-		mainViewController.view.alpha = 1
 		(menuView.menu.views?.first as? MaterialButton)?.animate(MaterialAnimation.rotate(-0.125))
 	}
 	

Material.podspec

 Pod::Spec.new do |s|
   s.name = 'Material'
-  s.version = '1.34.10'
+  s.version = '1.35.0'
   s.license = 'BSD'
   s.summary = 'Express your creativity with Material, an animation and graphics framework for Google\'s Material Design and Apple\'s Flat UI in Swift.'
   s.homepage = 'http://cosmicmind.io'

Material.xcodeproj/project.pbxproj

@@ -378,8 +378,8 @@
 				96442ADC1C28EF1400C3C574 /* TableView */,
 				96CC08891C7FEBE10034FF84 /* CollectionView */,
 				965C58BD1C6B8D3300CFB4E1 /* Grid */,
-				96A71E921C6FBC2900C0C4AE /* Menu */,
 				96A71EC51C6FFEF300C0C4AE /* Switch */,
+				96A71E921C6FBC2900C0C4AE /* Menu */,
 				96CC08561C7E0EC00034FF84 /* ControlView */,
 				96D88C541C132A7700B91418 /* StatusBar */,
 				9626C2DB1C794FBB007CA8E0 /* SearchBar */,

Sources/MenuViewController.swift

@@ -129,10 +129,9 @@ public class MenuViewController: UIViewController {
 	*/
 	public func openMenu(completion: (() -> Void)? = nil) {
 		if true == userInteractionEnabled {
-			menuView.open { [weak self] in
-				self?.userInteractionEnabled = false
-				completion?()
-			}
+			userInteractionEnabled = false
+			mainViewController.view.alpha = 0.5
+			menuView.open(completion)
 		}
 	}
 	
@@ -143,10 +142,9 @@ public class MenuViewController: UIViewController {
 	*/
 	public func closeMenu(completion: (() -> Void)? = nil) {
 		if false == userInteractionEnabled {
-			menuView.close { [weak self] in
-				self?.userInteractionEnabled = true
-				completion?()
-			}
+			userInteractionEnabled = true
+			mainViewController.view.alpha = 1
+			menuView.close(completion)
 		}
 	}