iOS: Move UIView helpers to once place

Change-Id: I9e20d23ad813503ea5c6bef3303ebc0f6b9e99cd
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>

src/plugins/platforms/ios/qioswindow.h

@@ -42,11 +42,6 @@
 class QIOSContext;
 class QIOSWindow;
 
-@interface UIView (QIOS)
-@property(readonly) QWindow *qwindow;
-@property(readonly) UIViewController *viewController;
-@end
-
 QT_BEGIN_NAMESPACE
 
 @class QUIView;

src/plugins/platforms/ios/quiview.h

@@ -62,7 +62,9 @@ class QIOSWindow;
 - (void)clearAccessibleCache;
 @end
 
-@interface QUIView (QtHelpers)
+@interface UIView (QtHelpers)
+- (QWindow *)qwindow;
+- (UIViewController *)viewController;
 - (QIOSViewController*)qtViewController;
 @end