components/AppBar/docs/accessibility.md

### MDCAppBar Accessibility

Because the App Bar mirrors the state of your view controller's navigationItem, making an App Bar accessible often
does not require any extra work.

See the following examples:

##### Objective-C
```
self.navigationItem.rightBarButtonItem =
   [[UIBarButtonItem alloc] initWithTitle:@"Right"
                                    style:UIBarButtonItemStyleDone
                                   target:nil
                                   action:nil];

NSLog(@"accessibilityLabel: %@",self.navigationItem.rightBarButtonItem.accessibilityLabel);
// Prints out "accessibilityLabel: Right"
```

##### Swift
```
self.navigationItem.rightBarButtonItem =
    UIBarButtonItem(title: "Right", style: .done, target: nil, action: nil)

print("accessibilityLabel: \(self.navigationItem.rightBarButtonItem.accessibilityLabel)")
// Prints out "accessibilityLabel: Right"
```