Fix circle chart position

@@ -33,7 +33,7 @@
         CGFloat endAngle = clockwise ? -90.01f : 270.01f;
 
         _lineWidth = @8.0f;
-        UIBezierPath *circlePath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(self.frame.size.width/2, self.frame.size.height/2)
+        UIBezierPath *circlePath = [UIBezierPath bezierPathWithArcCenter:CGPointMake(self.center.x, self.center.y)
                                                                   radius:(self.frame.size.height * 0.5) - [_lineWidth floatValue]
                                                               startAngle:DEGREES_TO_RADIANS(startAngle)
                                                                 endAngle:DEGREES_TO_RADIANS(endAngle)

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="5056" systemVersion="13C1021" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" initialViewController="9Rt-UT-IxH">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6254" systemVersion="14B25" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" initialViewController="9Rt-UT-IxH">
     <dependencies>
-        <deployment defaultVersion="1536" identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="3733"/>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6247"/>
     </dependencies>
     <scenes>
-        <!--Chart View Controller - PNChart-->
+        <!--PNChart-->
         <scene sceneID="lC9-iu-Smd">
             <objects>
                 <viewController id="Tha-Wr-sPW" customClass="PCChartViewController" sceneMemberID="viewController">
@@ -24,7 +24,7 @@
             </objects>
             <point key="canvasLocation" x="536" y="31"/>
         </scene>
-        <!--Charts Table View Controller - PNChart-->
+        <!--PNChart-->
         <scene sceneID="pBo-qW-N8B">
             <objects>
                 <tableViewController id="cc5-BF-Ga2" customClass="PCChartsTableViewController" sceneMemberID="viewController">