Update demo with autolayout

Author: cemolcay

Keyboard/KeyboardViewController.swift

@@ -14,10 +14,21 @@ class KeyboardViewController: UIInputViewController, CustomKeyboardDelegate {
   // MARK: - Lifecycle
   override func viewDidLoad() {
     super.viewDidLoad()
+    setupKeyboard()
+  }
+
+  private func setupKeyboard() {
     customKeyboard = CustomKeyboard()
     customKeyboard.delegate = self
+    customKeyboard.translatesAutoresizingMaskIntoConstraints = false
     view.addSubview(customKeyboard)
 
+    // Autolayout
+    customKeyboard.leftAnchor.constraintEqualToAnchor(view.leftAnchor).active = true
+    customKeyboard.rightAnchor.constraintEqualToAnchor(view.rightAnchor).active = true
+    customKeyboard.topAnchor.constraintEqualToAnchor(view.topAnchor).active = true
+    customKeyboard.bottomAnchor.constraintEqualToAnchor(view.bottomAnchor).active = true
+
     // This is how you add extra buttons to layouts for customising CustomKeyboard without even subclass it!
     let customButton = KeyboardButton(
       type: .Text("🕶"),
@@ -30,11 +41,6 @@ class KeyboardViewController: UIInputViewController, CustomKeyboardDelegate {
       buttonIndex: 2)
   }
 
-  override func viewDidLayoutSubviews() {
-    super.viewDidLayoutSubviews()
-    customKeyboard?.frame = view.frame
-  }
-
   // MARK: CustomKeyboardDelegate
   func customKeyboardKeyButtonPressed(customKeyboard: CustomKeyboard, key: String) {
     if customKeyboard == self.customKeyboard {