Jwoo/ios a11y 2 (#8435)

* updated showcard to announce its state

* fixed formatting

---------

Co-authored-by: anna-dingler <[email protected]>

Author: jwoo-msft

source/ios/AdaptiveCards/ADCIOSVisualizer/ADCIOSVisualizer/ViewController.m

@@ -27,6 +27,7 @@
 @interface ViewController () {
     id<ACRIBaseActionSetRenderer> _defaultRenderer;
     ACRChatWindow *_dataSource;
+    __weak UIView *_targetView;
     dispatch_queue_t _global_queue;
     __weak AVPlayerViewController *_mediaViewController;
 }
@@ -212,7 +213,6 @@ - (void)viewDidLoad
 
     ACOFeatureRegistration *featureReg = [ACOFeatureRegistration getInstance];
     [featureReg addFeature:@"acTest" featureVersion:@"1.0"];
-
     [NSNotificationCenter.defaultCenter addObserver:self selector:@selector(handleVoiceOverEvent:) name:UIAccessibilityElementFocusedNotification object:nil];
 }
 
@@ -281,7 +281,7 @@ - (void)didFetchUserResponses:(ACOAdaptiveCard *)card action:(ACOBaseActionEleme
     } else if (action.type == ACRToggleVisibility) {
         [self reloadRowsAtChatWindowsWithIndexPaths:self.chatWindow.indexPathsForSelectedRows];
     } else if (action.type == ACRShowCard) {
-        [self reloadRowsAtChatWindowsWithIndexPaths:self.chatWindow.indexPathsForSelectedRows];
+        [self reloadRowsAtChatWindowsWithIndexPaths:self.chatWindow.indexPathsForSelectedRows targetView:_targetView];
     }
 }
 
@@ -313,6 +313,7 @@ - (void)didChangeViewLayout:(CGRect)oldFrame newFrame:(CGRect)newFrame propertie
 
 - (void)didChangeVisibility:(UIButton *)button isVisible:(BOOL)isVisible
 {
+    _targetView = button;
     if (isVisible) {
         button.backgroundColor = [UIColor redColor];
     } else {
@@ -665,6 +666,11 @@ - (void)reloadRowsAtChatWindowsWithIndexPathsAfterValidation:(NSArray<NSIndexPat
 }
 
 - (void)reloadRowsAtChatWindowsWithIndexPaths:(NSArray<NSIndexPath *> *)indexPaths
+{
+    [self reloadRowsAtChatWindowsWithIndexPaths:indexPaths targetView:nil];
+}
+
+- (void)reloadRowsAtChatWindowsWithIndexPaths:(NSArray<NSIndexPath *> *)indexPaths targetView:(UIView *)targetView
 {
     dispatch_async(_global_queue,
                    ^{
@@ -687,7 +693,7 @@ - (void)reloadRowsAtChatWindowsWithIndexPaths:(NSArray<NSIndexPath *> *)indexPat
                                    [self.chatWindow reloadData];
                                }
                                completion:^(BOOL finished) {
-                                   UIAccessibilityPostNotification(UIAccessibilityLayoutChangedNotification, nil);
+                                   UIAccessibilityPostNotification(UIAccessibilityLayoutChangedNotification, targetView);
                                }];
                        }
                    });

source/ios/AdaptiveCards/AdaptiveCards/AdaptiveCards/ACRShowCardTarget.mm

@@ -126,6 +126,9 @@ - (IBAction)toggleVisibilityOfShowCard
     }
     _button.selected = !isSelected;
 
+    NSString *hint = hidden ? @"card expanded" : @"card collapsed";
+    _button.accessibilityValue = NSLocalizedString(hint, nil);
+
     if ([_rootView.acrActionDelegate respondsToSelector:@selector(didChangeVisibility:isVisible:)]) {
         [_rootView.acrActionDelegate didChangeVisibility:_button isVisible:(!_adcView.hidden)];
     }