Add initWithCoder for bar chart

@@ -22,11 +22,29 @@
 
 @implementation PNBarChart
 
+- (id)initWithCoder:(NSCoder *)aDecoder
+{
+    self = [super initWithCoder:aDecoder];
+    
+    if (self) {
+        [self setupDefaultValues];
+    }
+    return self;
+}
+
 - (id)initWithFrame:(CGRect)frame
 {
     self = [super initWithFrame:frame];
 
     if (self) {
+        [self setupDefaultValues];
+    }
+
+    return self;
+}
+
+- (void)setupDefaultValues
+{
     self.backgroundColor = [UIColor whiteColor];
     self.clipsToBounds   = YES;
     _showLabel           = YES;
@@ -44,12 +62,8 @@
     _showChartBorder     = NO;
     _yChartLabelWidth    = 18;
     _rotateForXAxisText  = false;
-    }
-
-    return self;
 }
 
-
 - (void)setYValues:(NSArray *)yValues
 {
     _yValues = yValues;