fix issue #7 - keyboard show / hide support

Author: nicolaschengdev

README.md

@@ -58,7 +58,7 @@ WYPopoverController is for the presentation of content in popover on iPhone / iP
 
 ##### Gloss
 
-![](https://raw.github.com/nicolaschengdev/WYPopoverController/master/screenshots/appearance/small/wypopover_glossshadowcolor.png "glossShadowColor: #c3045e", glossShadowOffset: {0, 1.5}, glossShadowBlurRadius: 0") , ![](https://raw.github.com/nicolaschengdev/WYPopoverController/master/screenshots/appearance/small/wypopover_glossshadowblurradius_2.png "glossShadowColor: #c3045e, glossShadowOffset: {0, 1.5}, glossShadowBlurRadius: 2") , ![](https://raw.github.com/nicolaschengdev/WYPopoverController/master/screenshots/appearance/small/wypopover_glossshadowoffset_0-3.png "glossShadowColor: #c3045e, glossShadowOffset: {0, 3}, glossShadowBlurRadius: 0")
+![](https://raw.github.com/nicolaschengdev/WYPopoverController/master/screenshots/appearance/small/wypopover_glossshadowcolor.png "glossShadowColor: #c3045e, glossShadowOffset: {0, 1.5}, glossShadowBlurRadius: 0") , ![](https://raw.github.com/nicolaschengdev/WYPopoverController/master/screenshots/appearance/small/wypopover_glossshadowblurradius_2.png "glossShadowColor: #c3045e, glossShadowOffset: {0, 1.5}, glossShadowBlurRadius: 2") , ![](https://raw.github.com/nicolaschengdev/WYPopoverController/master/screenshots/appearance/small/wypopover_glossshadowoffset_0-3.png "glossShadowColor: #c3045e, glossShadowOffset: {0, 3}, glossShadowBlurRadius: 0")
 
 ##### Outer
 
@@ -156,6 +156,15 @@ UINavigationBar* appearance2 = [UINavigationBar appearanceWhenContainedIn:[UINav
 }
 ```
 
+### Handling popover controllers during orientation changes
+
+When showing a popover controller, there are times when you will need to handle how the popover controller appears after a change in device orientation.
+
+Situations when handling is required:
+
+* If the popover controller is presented from a target rectangle using the `-presentPopoverFromRect:inView:permittedArrowDirections:animated` method of UIPopoverController.
+* If the popover controller is presented from a bar button item that is removed after the rotation has finished.
+
 ### Change logs
 
 ---

WYPopoverController/WYPopoverController.h

@@ -87,8 +87,8 @@ typedef NS_OPTIONS(NSUInteger, WYPopoverArrowDirection) {
 
 @property (nonatomic, assign) BOOL wantsDefaultContentAppearance;
 @property (nonatomic, assign) UIEdgeInsets popoverLayoutMargins;
-
 @property (nonatomic, assign, readonly) BOOL isPopoverVisible;
+@property (nonatomic, strong, readonly) UIViewController* contentViewController;
 
 - (id)initWithContentViewController:(UIViewController *)viewController;