Added the getter for the side opened

Author: ipodishima

PPRevealSideViewController/PPRevealSideviewController/PPRevealSideViewController.h

@@ -230,6 +230,8 @@ typedef NSUInteger PPRevealSideOptions;
  */
 @property (nonatomic, assign) id <PPRevealSideViewControllerDelegate> delegate;
 
+@property (nonatomic, readonly) PPRevealSideDirection sideDirectionOpened;
+
 /**---------------------------------------------------------------------------------------
  * @name Init method
  *  ---------------------------------------------------------------------------------------

PPRevealSideViewController/PPRevealSideviewController/PPRevealSideViewController.m

@@ -507,6 +507,13 @@ - (void) setTapInteractionsWhenOpened:(PPRevealSideInteractions)tapInteractionsW
     [self didChangeValueForKey:@"tapInteractionsWhenOpened"];
 }
 
+#pragma mark - Getters
+
+- (PPRevealSideDirection) sideDirectionOpened
+{
+    return [self getSideToClose];
+}
+
 #pragma mark - Private methods
 
 - (void) setRootViewController:(UIViewController *)controller {