material-components_material-components-ios/components/Cards/docs/accessibility.md

Card Accessibility

To help ensure your cards are accessible to as many users as possible, please be sure to review the following recommendations:

Accessibility for Cards in a Collection

Since assistive technologies visit all cards in a collection in a sequential order, it is often easier to distinguish between elements that belong to different cards by aggregating all the card's information so the card is read as a single sentence.
This can be done by setting an appropriate accessibilityLabel for the card. Additionally, set the card's isAccessibilityElement to true. Cards are a container element and setting isAccessibiltyElement for a container turns off individually selecting its subelements.

Swift

  card.isAccessibilityElement = true
  card.accessibilityLabel = "Location \(userLocation.name) is popular with users " +
    "who enjoy \(userLocation.popularActivityMatchingUserProfile(userProfile))"

Objective-C

  card.isAccessibilityElement = YES;
  card.accessibilityLabel = [NSString 
    stringWithFormat:@"Location %@ is popular with users who enjoy %@",  
    userLocation.name, 
    userLocation.popularActivityMatchingUserProfile(userProfile)];

Accessibility for Single Cards

Nested elements in MDCCards are available to assistive technologies without additional customization, however additional setup may be needed to accommodate special scenarios, such as:

Accessibility for Single Cards: Images

Images that have additional context beyond text that is already presented on the card.
For example, news article images can benefit from an accessibilityLabel describing their content.

Swift

  articleImageView.isAccessibilityElement = true
  articleImageView.accessibilityLabel = "Event or scene description"

Objective-C

  articleImageView.isAccessibilityElement = YES;
  articleImageView.accessibilityLabel = @"Event or scene description";

Accessibility for Single Cards: Star Rating

Star or rating images should have an accessibilityLabel describing its purpuse and an accessibilityValue describing the rating value.

Swift

  ratingView.isAccessibilityElement = true
  ratingView.accessibilityLabel = "Average customer rating, out of " + 
    "\(MDCProductRating.maximumValue) stars"
  ratingView.accessibilityValue = (String)product.averageRating

Objective-C

  ratingView.isAccessibilityElement = YES;
  ratingView.accessibilityLabel = [NSString stringWithFormat:@"Average customer" +
    " rating, out of %d stars", MDCProductRating.maximumValue];
  ratingView.accessibilityValue = @(product.averageRating).stringValue;

Accessibility for Single Cards: Reordering elements

Primary content or actions that appear lower on the screen will be read last by assistive technologies, sometimes after longer or non-primary content. To change the order, or group elements together, you can make the card an accessibility container by adopting the UIAccessibilityContainer protocol. Grouping and order is controlled by creating as many UIAccessibilityElement elements as needed, and returning them in the desired order.