animation tab bar controller

iOSClient/Main/CCMainTabBarController.swift

@@ -60,6 +60,7 @@ class CCMainTabBarController : UITabBarController, UITabBarControllerDelegate {
         
         // Add the toView to the tab bar view
         fromView.superview?.addSubview(toView)
+        fromView.superview?.backgroundColor = UIColor.white
         
         // Position toView off screen (to the left/right of fromView)
         let screenWidth = UIScreen.main.bounds.size.width;