From e3751a52fecbfe6ce8a761c488dfabddbb56f8ad Mon Sep 17 00:00:00 2001
From: juanjovn <juanjovn@gmail.com>
Date: Sun, 1 Mar 2020 16:37:55 +0100
Subject: [PATCH] add capabilites for animating view transitions and fix a typo

---
 AMTabView/Classes/AMTabsViewController.swift | 29 +++++++++++++++++---
 1 file changed, 25 insertions(+), 4 deletions(-)

diff --git a/AMTabView/Classes/AMTabsViewController.swift b/AMTabView/Classes/AMTabsViewController.swift
index 4e566a9..a0bae69 100644
--- a/AMTabView/Classes/AMTabsViewController.swift
+++ b/AMTabView/Classes/AMTabsViewController.swift
@@ -151,14 +151,15 @@ open class AMTabsViewController: UIViewController {
     }
 
     let currentView = containerView.subviews.first
-    currentView?.removeFromSuperview()
 
-    let contoller = children[index]
-    let newView = contoller.view
+    let controller = children[index]
+    let newView = controller.view
     if newView?.superview == nil {
       containerView.addSubview(newView!)
-      contoller.didMove(toParent: self)
+      controller.didMove(toParent: self)
       newView?.frame = containerView.bounds
+    
+      doTransition(fromController: viewControllers![lastSelectedViewIndex ?? 0], toController: viewControllers![index], currentView: currentView, animate: true)
     }
 
     lastSelectedViewIndex = index
@@ -186,3 +187,23 @@ extension AMTabsViewController: AMTabViewDelegate {
   }
 
 }
+
+
+///
+/// Do the transition from current view to the target view. Allows to choose if the transition is animated or not.
+///
+func doTransition(fromController: UIViewController?, toController: UIViewController?,currentView: UIView?, animate: Bool){
+    
+    guard let fromView = fromController?.view, let toView = toController?.view else {
+        return
+   }
+    
+    if animate {
+        if fromView != toView {
+            UIView.transition(from: fromView, to: toView, duration: 0.3, options: [.transitionFlipFromLeft], completion: nil)
+        }
+    }else{
+        currentView?.removeFromSuperview()
+    }
+    
+}