add example to walk and expose responder chain

Author: mattneub

bk1ch11p472action/bk1ch11p472action/Base.lproj/Main.storyboard

@@ -37,6 +37,15 @@
                                     <action selector="buttonPressed:" destination="x5A-6p-PRh" eventType="touchUpInside" id="N6h-od-dCg"/>
                                 </connections>
                             </button>
+                            <button opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="Vfs-yC-YMh">
+                                <rect key="frame" x="69" y="264" width="119" height="30"/>
+                                <state key="normal" title="Responder Chain">
+                                    <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
+                                </state>
+                                <connections>
+                                    <action selector="showResponderChain:" destination="vXZ-lx-hvc" eventType="touchUpInside" id="poO-6m-HyX"/>
+                                </connections>
+                            </button>
                         </subviews>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
                     </view>

bk1ch11p472action/bk1ch11p472action/ViewController.swift

@@ -30,6 +30,12 @@ class ViewController: UIViewController {
     }
 
 
+    @IBAction func showResponderChain(sender: UIResponder) {
+        var r : UIResponder?
+        for (r = sender; r != nil; r = r!.nextResponder()) {
+            println(r!)
+        }
+    }
 
 }