tab bar history

MVMCoreUI/Atomic/Molecules/HorizontalCombinationViews/TabBar.swift

@@ -99,6 +99,10 @@ import Foundation
             self.tabBar(self, didSelect: newSelectedItem)
         })
     }
+    
+    public func currentTabIndex() -> Int {
+        return model.selectedTab
+    }
 }
 
 extension UITabBarItem: MFButtonProtocol {

MVMCoreUI/Atomic/Protocols/TabBarProtocol.swift

@@ -17,4 +17,7 @@ import Foundation
     
     /// Should select the tab index. As if the user selected it.
     @objc func selectTab(at index: Int)
+    
+    /// Returns the current tab
+    @objc func currentTabIndex() -> Int
 }

MVMCoreUI/BaseControllers/ViewController.swift

@@ -39,6 +39,9 @@ import UIKit
     
     public var selectedField: UIView?
     
+    // Stores the previous tab bar index.
+    public var tabBarIndex: Int?
+    
     /// Checks if the screen width has changed
     open func screenSizeChanged() -> Bool {
         return !MVMCoreGetterUtility.cgfequalwiththreshold(previousScreenSize.width, view.bounds.size.width, 0.1)
@@ -318,13 +321,27 @@ import UIKit
     //--------------------------------------------------
     
     open func updateTabBar() {
-        guard MVMCoreUISplitViewController.main()?.getCurrentDetailViewController() == self,
+        guard MVMCoreUISplitViewController.main()?.getCurrentDetailViewController() == self else { return }
-            let tabModel = pageModel as? TabPageModelProtocol else { return }
         MVMCoreUISplitViewController.main()?.tabBar?.delegateObject = delegateObjectIVar
-        if let index = tabModel.tabBarIndex {
+        
+        if let index = (pageModel as? TabPageModelProtocol)?.tabBarIndex {
             MVMCoreUISplitViewController.main()?.tabBar?.highlightTab(at: index)
+        } else if let index = loadObject?.requestParameters?.actionMap?["tabBarIndex"] as? Int {
+            MVMCoreUISplitViewController.main()?.tabBar?.highlightTab(at: index)
+        } else if let index = self.tabBarIndex {
+            MVMCoreUISplitViewController.main()?.tabBar?.highlightTab(at: index)
+        } else if let index = MVMCoreUISplitViewController.main()?.tabBar?.currentTabIndex() {
+            // Store current tab index for cases like back button.
+            self.tabBarIndex = index
+        }
+        
+        if let hidden = (pageModel as? TabPageModelProtocol)?.tabBarHidden {
+            MVMCoreUISplitViewController.main()?.updateTabBarShowing(!hidden)
+        } else if let hidden = loadObject?.requestParameters?.actionMap?["tabBarHidden"] as? Bool {
+            MVMCoreUISplitViewController.main()?.updateTabBarShowing(!hidden)
+        } else {
+            MVMCoreUISplitViewController.main()?.updateTabBarShowing(true)
         }
-        MVMCoreUISplitViewController.main()?.updateTabBarShowing(!tabModel.tabBarHidden)
     }
     
     //--------------------------------------------------
@@ -454,15 +471,6 @@ import UIKit
             loadObject?.requestParameters?.openSupportPanel ?? (loadObject?.systemParametersJSON?.boolForKey(KeyOpenSupport) ?? false) == true {
             MVMCoreUISession.sharedGlobal()?.splitViewController?.showRightPanel(animated: true)
         }
-        
-        // Selects the tab if needed. Page driven takes priority over action driven (see viewWillAppear)
-        if let tab: Int = loadObject?.requestParameters?.actionMap?["tabBarIndex"] as? Int,
-            error == nil,
-            loadObject?.pageJSON?["tabBarIndex"] == nil {
-            MVMCoreDispatchUtility.performBlock(onMainThread: {
-                MVMCoreUISplitViewController.main()?.tabBar?.highlightTab(at: tab)
-            })
-        }
     }
     
     //--------------------------------------------------