Updated podspec

Example/MainViewController.swift

@@ -54,7 +54,7 @@ class MainViewController: UIViewController {
         menuScaleFactorSlider.value = Float(settings.presentationStyle.menuScaleFactor)
         presentingAlphaSlider.value = Float(settings.presentationStyle.presentingEndAlpha)
         presentingScaleFactorSlider.value = Float(settings.presentationStyle.presentingScaleFactor)
-        screenWidthSlider.value = Float(settings.menuWidth / view.frame.width)
+        screenWidthSlider.value = Float(settings.menuWidth / min(view.frame.width, view.frame.height))
         shadowOpacitySlider.value = Float(settings.presentationStyle.onTopShadowOpacity)
     }
 

Pod/Classes/Print.swift

@@ -13,22 +13,30 @@ internal enum Print: String { case
     menuAlreadyAssigned = "%@ was already assigned to the %@ of %@. When using multiple SideMenuManagers you may want to use new instances of UISideMenuNavigationController instead of existing instances to avoid crashes if the menu is presented more than once.",
     menuInUse = "%@ cannot be modified while it's presented.",
     panGestureAdded = "%@ was called before %@ or %@ was set. Gestures will not work without a menu.",
-    property = "a menu's %@ property can only be changed when it is hidden.",
+    property = "A menu's %@ property can only be changed when it is hidden.",
     screenGestureAdded = "%@ was called before %@ was set. The gesture will not work without a menu. Use %@ to add gestures for only one menu.",
     transitioningDelegate = "SideMenu requires use of the transitioningDelegate. It cannot be modified."
 
-    internal static func warning(_ print: Print, arguments: CVarArg..., required: Bool = false) {
-        warning(String(format: print.rawValue, arguments), required: required)
+    enum PropertyName: String { case
+        leftSide
     }
 
-    internal static func warning(_ print: Print, required: Bool = false) {
+    static func warning(_ print: Print, arguments: CVarArg..., required: Bool = false) {
+        warning(String(format: print.rawValue, arguments: arguments), required: required)
+    }
+
+    static func warning(_ print: Print, arguments: PropertyName..., required: Bool = false) {
+        warning(String(format: print.rawValue, arguments: arguments.map { $0.rawValue }), required: required)
+    }
+
+    static func warning(_ print: Print, required: Bool = false) {
         warning(print.rawValue, required: required)
     }
 }
 
 private extension Print {
 
-    private static func warning(_ message: String, required: Bool = false) {
+    static func warning(_ message: String, required: Bool = false) {
         let message = "SideMenu Warning: \(message)"
 
         if required {

Pod/Classes/Protected.swift

@@ -9,32 +9,18 @@ import Foundation
 
 internal final class Protected<T: Equatable> {
 
-    typealias ConditionBlock = (T) -> Bool
-    typealias Block = (T) -> Void
+    typealias ConditionBlock = (_ oldValue: T, T) -> T
 
     private var _value: T
-    private var conditionBlock: ConditionBlock
-    private var thenBlock: Block?
-    private var elseBlock: Block?
+    private var condition: ConditionBlock
 
     public var value: T {
-        get {
-            return _value
-        }
-        set {
-            guard conditionBlock(_value) else {
-                elseBlock?(_value)
-                return
-            }
-            _value = newValue
-            thenBlock?(_value)
-        }
+        get { return _value }
+        set { _value = condition(_value, newValue) }
     }
 
-    init(_ value: T, if conditionBlock: @escaping ConditionBlock, then thenBlock: Block? = nil, else elseBlock: Block? = nil) {
+    init(_ value: T, when condition: @escaping ConditionBlock) {
         self._value = value
-        self.conditionBlock = conditionBlock
-        self.thenBlock = thenBlock
-        self.elseBlock = elseBlock
+        self.condition = condition
     }
 }

Pod/Classes/SideMenuManager.swift

@@ -36,15 +36,8 @@ public class SideMenuManager: NSObject {
         }
     }
 
-    private var _leftMenu: Protected<Menu?> =
-        Protected(nil,
-                  if: { $0?.isHidden != false },
-                  else: { _ in Print.warning(.menuInUse, arguments: PresentDirection.left.name, required: true) } )
-
-    private var _rightMenu: Protected<Menu?> =
-        Protected(nil,
-                  if: { $0?.isHidden != false },
-                  else: { _ in Print.warning(.menuInUse, arguments: PresentDirection.right.name, required: true) } )
+    private var _leftMenu: Protected<Menu?> = Protected(nil) { SideMenuManager.setMenu(fromMenu: $0, toMenu: $1) }
+    private var _rightMenu: Protected<Menu?> = Protected(nil) { SideMenuManager.setMenu(fromMenu: $0, toMenu: $1) }
 
     private var switching: Bool = false
 
@@ -58,13 +51,23 @@ public class SideMenuManager: NSObject {
 
     /// The left menu.
     open var leftMenuNavigationController: UISideMenuNavigationController? {
-        get { return _leftMenu.value }
+        get {
+            if _leftMenu.value?.isHidden == true {
+                _leftMenu.value?.leftSide = true
+            }
+            return _leftMenu.value
+        }
         set(menu) { _leftMenu.value = menu }
     }
     
     /// The right menu.
     open var rightMenuNavigationController: UISideMenuNavigationController? {
-        get { return _rightMenu.value }
+        get {
+            if _rightMenu.value?.isHidden == true {
+                _rightMenu.value?.leftSide = false
+            }
+            return _rightMenu.value
+        }
         set(menu) { _rightMenu.value = menu }
     }
 
@@ -123,6 +126,14 @@ internal extension SideMenuManager {
         case false: rightMenuNavigationController = menu
         }
     }
+
+    private class func setMenu(fromMenu: Menu?, toMenu: Menu?) -> Menu? {
+        if fromMenu?.isHidden == false {
+            Print.warning(.menuInUse, arguments: PresentDirection.left.name, required: true)
+            return fromMenu
+        }
+        return toMenu
+    }
 }
 
 private extension SideMenuManager {
@@ -210,7 +221,7 @@ private extension SideMenuManager {
         }
     }
 
-    private var activeViewController: UIViewController? {
+    var activeViewController: UIViewController? {
         return UIApplication.shared.keyWindow?.rootViewController?.activeViewController
     }
 }

Pod/Classes/UISideMenuNavigationController.swift

@@ -67,14 +67,15 @@ internal typealias Menu = UISideMenuNavigationController
 @objcMembers
 open class UISideMenuNavigationController: UINavigationController {
 
-    private enum PropertyName: String { case
-        leftSide
+    private lazy var _leftSide =
+        Protected(false) { [weak self] oldValue, newValue in
+            guard self?.isHidden != false else {
+                Print.warning(.property, arguments: .leftSide, required: true)
+                return oldValue
+            }
+            return newValue
     }
 
-    private lazy var _leftSide = Protected(false,
-                                           if: { [weak self] _ in self?.isHidden != false },
-                                           else: { _ in Menu.elseCondition(.leftSide) } )
-
     private weak var _sideMenuManager: SideMenuManager?
     private weak var foundViewController: UIViewController?
     private weak var interactionController: SideMenuInteractionController?
@@ -550,10 +551,6 @@ private extension UISideMenuNavigationController {
         }
     }
 
-    private class func elseCondition(_ propertyName: PropertyName) {
-        Print.warning(.property, arguments: propertyName.rawValue, required: true)
-    }
-
     weak var activeDelegate: UISideMenuNavigationControllerDelegate? {
         guard !view.isHidden else { return nil }
         if let sideMenuDelegate = sideMenuDelegate {

SideMenu.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = "SideMenu"
-  s.version          = "6.0.8"
+  s.version          = "6.0.9"
   s.summary          = "Simple side menu control for iOS in Swift inspired by Facebook. Right and Left sides. No coding required."
 
 # This description is used to generate tags and improve search results.