Adds support for counter-clockwise progress

Pod/Classes/MBCircularProgressBarLayer.h

@@ -155,5 +155,11 @@ typedef NS_ENUM(NSInteger, MBCircularProgressBarAppearanceType) {
  * Default is NO
  */
 @property (nonatomic,assign)  BOOL      countdown;
+
+/**
+ * Draw the progress circle in counter-clockwise fashion.
+ */
+@property (nonatomic,assign) BOOL       counterclockwise;
 
+
 @end

Pod/Classes/MBCircularProgressBarLayer.m

@@ -38,6 +38,7 @@ @implementation MBCircularProgressBarLayer
 @dynamic showValueString;
 @dynamic textOffset;
 @dynamic countdown;
+@dynamic counterclockwise;
 
 #pragma mark - Drawing
 
@@ -120,11 +121,24 @@ - (void)drawProgressBar:(CGRect)rect context:(CGContextRef)c{
     }
 
     CGMutablePathRef arc = CGPathCreateMutable();
-    CGPathAddArc(arc, NULL,
-                 center.x, center.y, radius,
-                 (self.progressAngle/100.f)*M_PI-((-self.progressRotationAngle/100.f)*2.f+0.5)*M_PI-(2.f*M_PI)*(self.progressAngle/100.f)*(100.f-100.f*self.value/self.maxValue)/100.f,
-                 -(self.progressAngle/100.f)*M_PI-((-self.progressRotationAngle/100.f)*2.f+0.5)*M_PI,
-                 YES);
+
+    CGFloat startAngle = (self.progressAngle/100.f)*M_PI-((-self.progressRotationAngle/100.f)*2.f+0.5)*M_PI-(2.f*M_PI)*(self.progressAngle/100.f)*(100.f-100.f*self.value/self.maxValue)/100.f;
+    CGFloat endAngle = -(self.progressAngle/100.f)*M_PI-((-self.progressRotationAngle/100.f)*2.f+0.5)*M_PI;
+    BOOL clockwise = !self.counterclockwise;
+
+    if (self.counterclockwise)
+    {
+        startAngle = -(startAngle + M_PI);
+    }
+
+    CGPathAddArc(arc,
+                 NULL,
+                 center.x,
+                 center.y,
+                 radius,
+                 startAngle,
+                 endAngle,
+                 clockwise);
 
     CGPathRef strokedArc =
     CGPathCreateCopyByStrokingPath(arc, NULL,

Pod/Classes/MBCircularProgressBarView.h

@@ -142,8 +142,13 @@ IB_DESIGNABLE
 
 
 /**
- * The bool value to apply to if its counddown or not
+ * The bool value to apply to if its countdown or not
  */
 @property (nonatomic,assign) IBInspectable BOOL      countdown;
+
+/**
+ * The bool value to apply if the progress bar should rendered counter-clockwise.
+ */
+@property (nonatomic,assign) IBInspectable BOOL      counterclockwise;
 
 @end

Pod/Classes/MBCircularProgressBarView.m

@@ -67,6 +67,7 @@ -(void)initView:(CGRect)frame{
     [self setTextOffset:CGPointMake(0, 0)];
     [self setUnitFontName:@"HelveticaNeue-Thin"];
     [self setCountdown:NO];
+    [self setCounterclockwise:NO];
 }
 
 #pragma mark - Getters and Setters for layer properties
@@ -304,6 +305,14 @@ -(void)setCountdown:(BOOL)countdown {
 -(BOOL)countdown {
   return self.progressLayer.countdown;
 }
+
+-(void)setCounterclockwise:(BOOL)counterclockwise {
+    self.progressLayer.counterclockwise = counterclockwise;
+}
+
+-(BOOL)counterclockwise {
+    return self.progressLayer.counterclockwise;
+}
 
 #pragma mark - CALayer