Add tabs naturalslide option

Sources/iOS/TabsController.swift

@@ -90,6 +90,18 @@ open class TabsController: TransitionController {
         }
     }
     
+    fileprivate var _isAllDirectionSlideEnable: Bool = false
+    
+    /// user can slide views left, right naturally.
+    open var isAllDirectionSlideEnabled: Bool {
+        get {
+            return _isAllDirectionSlideEnable
+        }
+        set(newVal) {
+            _isAllDirectionSlideEnable = newVal
+        }
+    }
+    
     /// A reference to the currently selected view controller index value.
     @IBInspectable
     open fileprivate(set) var selectedIndex = 0
@@ -276,6 +288,15 @@ fileprivate extension TabsController {
             return
         }
         
+        if(_isAllDirectionSlideEnable) {
+            tabsTransition(tabsController: self, to: viewControllers[i], completion: { [weak self] (isFinished) in
+                guard isFinished else {
+                    return
+                }
+                
+                self?.selectedIndex = i
+            })
+        } else {
             transition(to: viewControllers[i]) { [weak self] (isFinished) in
                 guard isFinished else {
                     return
@@ -284,4 +305,5 @@ fileprivate extension TabsController {
                 self?.selectedIndex = i
             }
         }
+    }
 }

Sources/iOS/TransitionController.swift

@@ -161,6 +161,60 @@ open class TransitionController: UIViewController {
     }
     
     /**
+     A method to swap rootViewController objects specially in tabsController.
+     - Parameter tabsController: indicate tabsController. if tabsController nil then default transition method will be executed.
+     - Parameter toViewController: The UIViewController to swap
+     with the active rootViewController.
+     - Parameter completion: A completion block that is execited after
+     the transition animation from the active rootViewController
+     to the toViewController has completed.
+     */
+    open func tabsTransition(tabsController: TabsController?, to viewController: UIViewController, completion: ((Bool) -> Void)? = nil) {
+        guard let fvc = rootViewController else {
+            return
+        }
+        
+        let tvc = viewController
+        
+        tvc.view.isHidden = false
+        tvc.view.frame = container.bounds
+        
+        if(tabsController == nil) {
+            tvc.motionModalTransitionType = motionTransitionType
+            
+            view.isUserInteractionEnabled = false
+            Motion.shared.transition(from: fvc, to: tvc, in: container) { [weak self, tvc = tvc, completion = completion] (isFinished) in
+                guard let s = self else {
+                    return
+                }
+                
+                s.rootViewController = tvc
+                s.view.isUserInteractionEnabled = true
+                completion?(isFinished)
+            }
+        }
+        let fvcIndex = tabsController?.viewControllers.index(of: fvc)
+        let tvcIndex = tabsController?.viewControllers.index(of: viewController)
+        
+        if(fvcIndex! < tvcIndex!) {
+            tvc.motionModalTransitionType = .slide(direction: .left)
+        } else {
+            tvc.motionModalTransitionType = .slide(direction: .right)
+        }
+        
+        view.isUserInteractionEnabled = false
+        Motion.shared.transition(from: fvc, to: tvc, in: container) { [weak self, tvc = tvc, completion = completion] (isFinished) in
+            guard let s = self else {
+                return
+            }
+            
+            s.rootViewController = tvc
+            s.view.isUserInteractionEnabled = true
+            completion?(isFinished)
+        }
+    }
+    
+    /**
      To execute in the order of the layout chain, override this
      method. `layoutSubviews` should be called immediately, unless you
      have a certain need.