Merge commit '7621e2f8dec938cf48181c8b10afc9b01f444e68' into beta

submodules/Display/Source/TabBarController.swift

@@ -0,0 +1,28 @@
+import Foundation
+import UIKit
+import AsyncDisplayKit
+import SwiftSignalKit
+
+public enum TabBarItemSwipeDirection {
+    case left
+    case right
+}
+
+public protocol TabBarController: ViewController {
+    var currentController: ViewController? { get }
+    var controllers: [ViewController] { get }
+    var selectedIndex: Int { get set }
+    
+    func setControllers(_ controllers: [ViewController], selectedIndex: Int?)
+    
+    func updateBackgroundAlpha(_ alpha: CGFloat, transition: ContainedViewLayoutTransition)
+    
+    func frameForControllerTab(controller: ViewController) -> CGRect?
+    func isPointInsideContentArea(point: CGPoint) -> Bool
+    
+    func updateIsTabBarEnabled(_ value: Bool, transition: ContainedViewLayoutTransition)
+    func updateIsTabBarHidden(_ value: Bool, transition: ContainedViewLayoutTransition)
+    func updateLayout(transition: ContainedViewLayoutTransition)
+    
+    func updateControllerLayout(controller: ViewController)
+}