Add change value function

@@ -22,6 +22,9 @@
                                 <state key="normal" title="Change Value">
                                     <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
                                 </state>
+                                <connections>
+                                    <action selector="changeValue:" destination="Tha-Wr-sPW" eventType="touchUpInside" id="zeG-Cp-Wjs"/>
+                                </connections>
                             </button>
                         </subviews>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>

@@ -9,5 +9,6 @@
 #import <UIKit/UIKit.h>
 
 @interface PCChartViewController : UIViewController
+- (IBAction)changeValue:(id)sender;
 
 @end

@@ -10,4 +10,10 @@
 
 @implementation PCChartViewController
 
+- (IBAction)changeValue:(id)sender {
+    if ([self.title isEqualToString:@"Bar Chart"]) {
+        
+    }
+}
+
 @end