| ### Subclassing considerations |
| |
| A subclass of your view controller may add additional views in their viewDidLoad, potentially |
| resulting in the header being covered by the new views. It is the responsibility of the subclass to |
| take the z-index into account: |
| |
| <!--<div class="material-code-render" markdown="1">--> |
| #### Swift |
| ```swift |
| view.insertSubview(myCustomView, belowSubview: headerViewController.headerView) |
| ``` |
| |
| #### Objective-C |
| |
| ```objc |
| [self.view insertSubview:myCustomView belowSubview:self.headerViewController.headerView]; |
| ``` |
| <!--</div>--> |
