no message

Display/TabBarController.swift

@@ -0,0 +1,101 @@
+import Foundation
+import UIKit
+import AsyncDisplayKit
+
+public class TabBarController: ViewController {
+    private var tabBarControllerNode: TabBarControllerNode {
+        get {
+            return super.displayNode as! TabBarControllerNode
+        }
+    }
+    
+    public var controllers: [ViewController] = [] {
+        didSet {
+            self.tabBarControllerNode.tabBarNode.tabBarItems = self.controllers.map({ $0.tabBarItem })
+            
+            if oldValue.count == 0 && self.controllers.count != 0 {
+                self.updateSelectedIndex()
+            }
+        }
+    }
+    
+    private var _selectedIndex: Int = 1
+    public var selectedIndex: Int {
+        get {
+            return _selectedIndex
+        } set(value) {
+            let index = max(0, min(self.controllers.count - 1, value))
+            if _selectedIndex != index {
+                _selectedIndex = index
+                
+                self.updateSelectedIndex()
+            }
+        }
+    }
+    
+    private var layout: ViewControllerLayout?
+    private var currentController: ViewController?
+    
+    override public init() {
+        super.init()
+    }
+
+    required public init(coder aDecoder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    override public func loadDisplayNode() {
+        self.displayNode = TabBarControllerNode()
+        
+        self.updateSelectedIndex()
+    }
+    
+    private func updateSelectedIndex() {
+        if !self.isNodeLoaded {
+            return
+        }
+        
+        if let currentController = self.currentController {
+            currentController.willMoveToParentViewController(nil)
+            self.tabBarControllerNode.currentControllerView = nil
+            currentController.removeFromParentViewController()
+            currentController.didMoveToParentViewController(nil)
+            
+            self.currentController = nil
+        }
+        
+        if self._selectedIndex < self.controllers.count {
+            self.currentController = self.controllers[self._selectedIndex]
+        }
+        
+        if let currentController = self.currentController {
+            currentController.willMoveToParentViewController(self)
+            if let layout = self.layout {
+                currentController.view.frame = CGRect(origin: CGPoint(), size: layout.size)
+                
+                currentController.setParentLayout(self.childControllerLayoutForLayout(layout), duration: 0.0, curve: 0)
+            }
+            self.tabBarControllerNode.currentControllerView = currentController.view
+            self.addChildViewController(currentController)
+            currentController.didMoveToParentViewController(self)
+        }
+    }
+    
+    private func childControllerLayoutForLayout(layout: ViewControllerLayout) -> ViewControllerLayout {
+        var insets = layout.insets
+        insets.bottom += 49.0
+        return ViewControllerLayout(size: layout.size, insets: insets, inputViewHeight: layout.inputViewHeight)
+    }
+    
+    override public func updateLayout(layout: ViewControllerLayout, previousLayout: ViewControllerLayout?, duration: Double, curve: UInt) {
+        super.updateLayout(layout, previousLayout: previousLayout, duration: duration, curve: curve)
+        
+        self.tabBarControllerNode.updateLayout(layout, previousLayout: previousLayout, duration: duration, curve: curve)
+        
+        self.layout = layout
+        if let currentController = self.currentController {
+            currentController.view.frame = CGRect(origin: CGPoint(), size: layout.size)
+            currentController.setParentLayout(self.childControllerLayoutForLayout(layout), duration: duration, curve: curve)
+        }
+    }
+}