Fixed line transition flick

Sources/iOS/TabBar.swift

@@ -279,6 +279,7 @@ open class TabBar: Bar {
     didSet {
       oldValue?.isSelected = false
       selectedTabItem?.isSelected = true
+      updateScrollView()
     }
   }
   

Sources/iOS/TabsController.swift

@@ -472,7 +472,7 @@ extension TabsController {
       }
       
       self?.selectedIndex = index
-      self?.tabBar.select(at: index)
+      self?.tabBar.selectedTabItem = self?.tabBar.tabItems[index]
     }
     
     return true