Fix pie chart position

@@ -16,7 +16,19 @@
                     <view key="view" contentMode="scaleToFill" id="PPb-b8-nBo">
                     <view key="view" contentMode="scaleToFill" id="PPb-b8-nBo">
                         <rect key="frame" x="0.0" y="0.0" width="320" height="568"/>
                         <rect key="frame" x="0.0" y="0.0" width="320" height="568"/>
                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                        <subviews>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="L3F-13-Wf5">
+                                <rect key="frame" x="113" y="364" width="95" height="30"/>
+                                <state key="normal" title="Change Value">
+                                    <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
+                                </state>
+                            </button>
+                        </subviews>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                        <constraints>
+                            <constraint firstItem="L3F-13-Wf5" firstAttribute="top" secondItem="znr-YO-4a4" secondAttribute="bottom" constant="300" id="ewm-kv-p8k"/>
+                            <constraint firstAttribute="centerX" secondItem="L3F-13-Wf5" secondAttribute="centerX" id="zXw-WV-mro"/>
+                        </constraints>
                     </view>
                     </view>
                     <navigationItem key="navigationItem" title="PNChart" id="Ukg-Sg-E2z"/>
                     <navigationItem key="navigationItem" title="PNChart" id="Ukg-Sg-E2z"/>
                 </viewController>
                 </viewController>

@@ -136,9 +136,9 @@
                            [PNPieChartDataItem dataItemWithValue:40 color:PNDeepGreen description:@"GOOG I/O"],
                            [PNPieChartDataItem dataItemWithValue:40 color:PNDeepGreen description:@"GOOG I/O"],
                            ];
                            ];
 
 
-        PNPieChart *pieChart = [[PNPieChart alloc] initWithFrame:CGRectMake(40.0, 155.0, 240.0, 240.0) items:items];
+        PNPieChart *pieChart = [[PNPieChart alloc] initWithFrame:CGRectMake(SCREEN_WIDTH /2.0 - 100, 135, 200.0, 200.0) items:items];
         pieChart.descriptionTextColor = [UIColor whiteColor];
         pieChart.descriptionTextColor = [UIColor whiteColor];
-        pieChart.descriptionTextFont  = [UIFont fontWithName:@"Avenir-Medium" size:14.0];
+        pieChart.descriptionTextFont  = [UIFont fontWithName:@"Avenir-Medium" size:11.0];
         pieChart.descriptionTextShadowColor = [UIColor clearColor];
         pieChart.descriptionTextShadowColor = [UIColor clearColor];
         [pieChart strokeChart];
         [pieChart strokeChart];