use UIColor for the color property rather than CGColorRef; makes for …

…easier use of UIKit UIColor, and prevents ARC auto-released UIColor from being gone by the time the reference occurs

MBProgressHUD.h

@@ -312,10 +312,11 @@ typedef void (^MBProgressHUDCompletionBlock)();
 @property (assign) float opacity;
 
 /**
- * The color of the HUD window. Defaults to black. If this property is set, opacity is set using this UIColor and the 
- * opacity property is not used
+ * The color of the HUD window. Defaults to black. If this property is set, color is set using
+ * this UIColor and the opacity property is not used.  using retain because performing copy on
+ * UIColor base colors (like [UIColor greenColor]) cause problems with the copyZone.
  */
-@property (assign) CGColorRef color;
+@property (retain) UIColor *color;
 
 /** 
  * The x-axis offset of the HUD relative to the centre of the superview. 

MBProgressHUD.m

@@ -209,6 +209,7 @@ - (void)dealloc {
 	[self unregisterFromNotifications];
 	[self unregisterFromKVO];
 #if !__has_feature(objc_arc)
+	[color release];
 	[indicator release];
 	[label release];
 	[detailsLabel release];
@@ -587,8 +588,8 @@ - (void)drawRect:(CGRect)rect {
 	}
 
     // Set background rect color
-    if(self.color){
-        CGContextSetFillColorWithColor(context, self.color); 
+    if (self.color) {
+        CGContextSetFillColorWithColor(context, self.color.CGColor);
     } else {
         CGContextSetGrayFillColor(context, 0.0f, self.opacity);
     }