Merge pull request #66 from barz/completion-block

adding popover completion block

Author: nicolaschengdev

WYPopoverController/WYPopoverController.h

@@ -127,6 +127,14 @@ typedef NS_OPTIONS(NSUInteger, WYPopoverAnimationOptions) {
                       animated:(BOOL)animated
                        options:(WYPopoverAnimationOptions)options;
 
+- (void)presentPopoverFromRect:(CGRect)rect
+                        inView:(UIView *)view
+      permittedArrowDirections:(WYPopoverArrowDirection)arrowDirections
+                      animated:(BOOL)animated
+                       options:(WYPopoverAnimationOptions)options
+                    completion:(void (^)(void))completion;
+
+
 - (void)presentPopoverFromBarButtonItem:(UIBarButtonItem *)item
                permittedArrowDirections:(WYPopoverArrowDirection)arrowDirections
                                animated:(BOOL)animated

WYPopoverController/WYPopoverController.m

@@ -1508,6 +1508,21 @@ - (void)presentPopoverFromRect:(CGRect)aRect
       permittedArrowDirections:(WYPopoverArrowDirection)arrowDirections
                       animated:(BOOL)aAnimated
                        options:(WYPopoverAnimationOptions)aOptions
+{
+    [self presentPopoverFromRect:aRect
+                          inView:aView
+        permittedArrowDirections:arrowDirections
+                        animated:aAnimated
+                         options:aOptions
+                      completion:nil];
+}
+
+- (void)presentPopoverFromRect:(CGRect)aRect
+                        inView:(UIView *)aView
+      permittedArrowDirections:(WYPopoverArrowDirection)arrowDirections
+                      animated:(BOOL)aAnimated
+                       options:(WYPopoverAnimationOptions)aOptions
+                    completion:(void (^)(void))completion
 {
     NSAssert((arrowDirections != WYPopoverArrowDirectionUnknown), @"WYPopoverArrowDirection must not be UNKNOWN");
 
@@ -1609,6 +1624,11 @@ - (void)presentPopoverFromRect:(CGRect)aRect
             {
                 [viewController viewDidAppear:YES];
             }
+            
+            if (completion)
+            {
+                completion();
+            }
         }];
     }
     else
@@ -1619,6 +1639,11 @@ - (void)presentPopoverFromRect:(CGRect)aRect
         {
             [viewController viewDidAppear:NO];
         }
+        
+        if (completion)
+        {
+            completion();
+        }
     }
 
     if (isListeningNotifications == NO)