Merge pull request #3603 from mstepanov/timob-11458

[TIMOB-11458] iOS: Accessibility: hide TiUIWindow when another window opens on top; send accessibility notification about screen update

iphone/Classes/TiWindowProxy.m

@@ -185,6 +185,8 @@ -(void)windowDidOpen
         }
         RELEASE_TO_NIL(animatedOver);
     }
+	// Send notification to Accessibility subsystem that the screen has changed. This will refresh accessibility focus
+	UIAccessibilityPostNotification(UIAccessibilityScreenChangedNotification, nil);
 }
 
 -(void)windowReady
@@ -244,6 +246,14 @@ -(void)windowClosed
 
 	[self windowDidClose];
 	[self forgetSelf];
+
+	// Make previous window elements accessible again
+	UIView *rootView = [[TiApp app] controller].view;
+	if ([TiUtils isIOS5OrGreater]) {
+		[(UIView *)[[rootView subviews] lastObject] setAccessibilityElementsHidden:NO];
+	}
+	// Send notification to Accessibility subsystem that the screen has changed. This will refresh accessibility focus
+	UIAccessibilityPostNotification(UIAccessibilityScreenChangedNotification, nil);
 }
 
 -(void)windowWillClose
@@ -709,6 +719,10 @@ -(void)attachViewToTopLevelWindow
      */
     if (![self _isChildOfTab]) {
         if (!modalFlag) {
+			// Hide inactive window elements for accessibility
+			if ([TiUtils isIOS5OrGreater]) {
+				[(UIView *)[[rootView subviews] lastObject] setAccessibilityElementsHidden:YES];
+			}
             [rootView addSubview:view_];
         }