From Stephan Huber, "* imageio: removed ReaderWriterImageIO_IOS.cpp, refactored ReaderWriterImageIO to work on OS X and IOS

* avfoundation: added support for IOS (CoreVideo-support is still in development, works only for SDK >= 6.0, set IPHONE_SDKVER in cMake accordingly)
* zeroconf: added ZeroConf-device-plugin (Mac/Win only, linux implementation missing) to advertise and discover services via ZeroConf/Bonjour, on windows you'll need the Bonjour SDK from Apple
* osgosc: modified the example to demonstrate the usage of the ZeroConf-plugin (start the example with the command-line-argument --zeroconf)
* SlideShowConstructor: enable/disable CoreVideo via a environment variable (P3D_ENABLE_CORE_VIDEO)
* RestHttp: mouse-motion-events get interpolated
* RestHttp: unhandled http-requests get sent as an user-event to the event-queue, all arguments get attached as user-values to the event
* modified some CMakeModules to work correctly when compiling for IOS
* fixed a compile-error for IOS in GraphicsWindowIOS
* some minor bugfixes"

include/osgViewer/api/IOS/GraphicsWindowIOS

@@ -148,7 +148,8 @@ class GraphicsWindowIOS : public osgViewer::GraphicsWindow
                 WindowData(UIView* window_or_view = NULL, DeviceOrientationFlags orientationFlags = ALL_ORIENTATIONS, float scaleFactor = -1.0f)
                 :   _windowOrView(window_or_view),
                     _deviceOrientationFlags(orientationFlags),
-                    _viewContentScaleFactor(scaleFactor)
+                    _viewContentScaleFactor(scaleFactor),
+                    _createTransparentView(false)
                 {
                 }
                 
@@ -157,11 +158,15 @@ class GraphicsWindowIOS : public osgViewer::GraphicsWindow
                 void setViewContentScaleFactor(float scaleFactor) { _viewContentScaleFactor = scaleFactor; }
                 
                 UIView* getWindowOrParentView() const { return _windowOrView; }
+                
+                bool getCreateTransparentView() { return _createTransparentView; }
+                void setCreateTransparentView(bool b) { _createTransparentView = b; }
             private:
 
                 UIView*                _windowOrView;
                 DeviceOrientationFlags _deviceOrientationFlags;
                 float                  _viewContentScaleFactor; 
+                bool                   _createTransparentView;
         
             friend class GraphicsWindowIOS;