Applies the specified layout attributes to the element.
- macOS 10.11+
The layout attributes to apply.
In your custom elements, you can use this method to apply the specified attributes to your content. For example, if your element object is a view controller, you would override this method and use it to apply the attributes to the root view object. When using your element with a layout object that supports custom attributes, you would also use this method to apply those custom attributes.